Introduction to Chemistry 5th Edition by Rich Bauer - Test Bank.

Introduction to Chemistry 5th Edition by Rich Bauer – Test Bank Description Introduction to Chemistry 5th Edition by Rich Bauer – Test Bank Sample Questions Instant Download With Answer s Introduction to Chemistry, 5e (Bauer) Chapter 3 Chemical Compounds 1) The figure shows all but which of the following? 1. A) two elements and a compound 2. B) a chemical reaction 3. C) one mixture and one pure substance 4. D) three compounds Answer: D Difficulty: 1 Easy Topic: Study of Chemistry Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter Accessibility: Keyboard Navigation 2) Which of the substances shown in the figure is an ionic compound? 1. A) K2S 2. B) Na2SO4 3. C) SO2 4. D) Both Na2SO4and SO2 5. E) Both K2S and Na2SO4 Answer: E Difficulty: 1 Easy Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 3) Which of the substances shown in the figure is a molecular compound? 1. A) Na3N 2. B) KNO3 3. C) NO2 4. D) Both Na3N and KNO3 5. E) Both KNO3and NO2 Answer: C Difficulty: 1 Easy Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 4) Which of the following combinations of elements in a compound would be molecular? 1. A) sodium and nitrogen 2. B) calcium and oxygen 3. C) nitrogen and oxygen 4. D) potassium and chlorine 5. E) sodium and sulfur Answer: C Difficulty: 1 Easy Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 5) Which of the following combinations of elements in a compound would be ionic? 1. A) barium and fluorine 2. B) hydrogen and sulfur 3. C) sulfur and oxygen 4. D) hydrogen and fluorine 5. E) all of these Answer: A Difficulty: 1 Easy Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 6) Which of the following combinations of elements in a compound would be ionic? 1. A) sodium and sulfur 2. B) nitrogen and sulfur 3. C) phosphorus and fluorine 4. D) hydrogen and oxygen 5. E) all of these Answer: A Difficulty: 1 Easy Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 7) Which of the following is classified as an ionic compound? 1. A) NO2 2. B) CF4 3. C) CH3OH 4. D) CaCO3 5. E) all of these Answer: D Difficulty: 1 Easy Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 8) Which of the following is classified as a molecular compound? 1. A) OH– 2. B) N2 3. C) SO2 4. D) Mg(NO3)2 5. E) all of these Answer: C Difficulty: 1 Easy Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 9) Rank the boiling points of the following compounds from lowest to highest: CO2, LiF, H2O 1. A) CO2< H2O < LiF 2. B) CO2< LiF < H2O 3. C) LiF < CO2< H2O 4. D) H2O < LiF < CO2 5. E) H2O < CO2< LiF Answer: A Difficulty: 2 Medium Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 10) Rank the boiling points of the following compounds from lowest to highest: C12H22O11 (sucrose), O2, NaF 1. A) C12H22O11(sucrose) < O2< NaF 2. B) O2< NaF < C12H22O11(sucrose) 3. C) O2< C12H22O11(sucrose) < NaF 4. D) NaF < O2< C12H22O11(sucrose) 5. E) NaF < C12H22O11(sucrose) < O2 Answer: C Difficulty: 2 Medium Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 11) Rank the boiling points of the following compounds from lowest to highest: N2, MgO, C2H5OH (ethyl alcohol) 1. A) MgO < C2H5OH (ethyl alcohol) < N2 2. B) MgO < N2< C2H5OH (ethyl alcohol) 3. C) N2< MgO < C2H5OH (ethyl alcohol) 4. D) N2< C2H5OH (ethyl alcohol) < MgO 5. E) C2H5OH (ethyl alcohol) < N2< MgO Answer: D Difficulty: 2 Medium Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 12) Which of the following statements regarding ionic and molecular compounds is correct? 1. A) Molecular compounds are expected to have very high melting and boiling points compared to ionic compounds. 2. B) Molecular compounds are strong electrolytes in aqueous solution. 3. C) An ionic compound can be a gas, liquid, or solid at room temperature. 4. D) Molecular compounds form crystalline solids that are hard and brittle. 5. E) Ionic compounds are expected to have very high melting and boiling points compared to ionic compounds. Answer: E Difficulty: 2 Medium Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Classification and States of Matter; Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 13) Which of the following is the correct formula for the bromide ion? 1. A) Br2 2. B) Br2– 3. C) Br22– 4. D) Br– 5. E) BrO3– Answer: D Difficulty: 2 Medium Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 14) Which of the following is the correct formula for the nitride ion? 1. A) N2 2. B) NO2– 3. C) NO3– 4. D) N23– 5. E) N3– Answer: A Difficulty: 2 Medium Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 15) Which combination of formula and name is incorrect? 1. A) Na+= sodium ion 2. B) Ca2+= calcium ion 3. C) N2–= nitride ion 4. D) F–= fluoride ion 5. E) O2– = oxide ion Answer: C Difficulty: 2 Medium Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 16) Which combination of formula and name is incorrect? 1. A) S2−= sulfide ion 2. B) Br−= bromide ion 3. C) Li+= lithium ion 4. D) Sr+= strontium ion 5. E) P3−= phosphide ion Answer: D Difficulty: 2 Medium Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 17) Which combination of formula and name is incorrect? 1. A) K+= potassium ion 2. B) I–= iodide ion 3. C) Mg+= magnesium ion 4. D) S2–= sulfide ion 5. E) N3–= nitride ion Answer: C Difficulty: 2 Medium Topic: Study of Chemistry; Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Properties of Matter; Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 18) The name of the oxoanion of nitrogen with a 1− charge shown in the figure is 1. A) nitrooxate ion. 2. B) nitride ion. 3. C) nitrite ion. 4. D) nitrate ion. 5. E) nitrous ion. Answer: C Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 19) The name of the oxoanion of nitrogen with a 1− charge shown in the figure is 1. A) nitrooxate ion. 2. B) nitride ion. 3. C) nitrite ion. 4. D) nitrate ion. 5. E) nitrous ion. Answer: D Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 20) The name of the oxoanion of sulfur with a 2− charge shown in the figure is 1. A) sulfite ion. 2. B) sulfate ion. 3. C) sulfide ion. 4. D) sulfurous ion. 5. E) sulfoxate ion. Answer: A Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 21) Which of the following combinations of formula and name is incorrect? 1. A) hydroxide ion = OH– 2. B) nitrate ion = NO3– 3. C) sulfide ion = SO32– 4. D) nitrite ion = NO2– 5. E) sulfate ion = SO42– Answer: C Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 22) Which of the following combinations of formula and name is incorrect? 1. A) nitride ion = NO2– 2. B) cyanide ion = CN– 3. C) chlorite ion = ClO2– 4. D) perchlorate ion = ClO4– 5. E) chloride ion = Cl– Answer: A Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 23) Which of the following combinations of formula and name is incorrect? 1. A) carbonate ion = CO32– 2. B) ammonium ion = NH3 3. C) bicarbonate ion = HCO3– 4. D) periodate ion = IO4– 5. E) hypochlorite ion = ClO– Answer: B Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 24) The formula for the permanganate ion is: 1. A) MnO4– 2. B) MnO22– 3. C) MnO3– 4. D) MnO32– 5. E) MnO42– Answer: A Difficulty: 1 Easy Topic: Components of Matter Bloom’s: 1. Remember Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 25) The formula for the ammonium ion is: 1. A) NH3+ 2. B) NH3 3. C) NH4+ 4. D) NH4 5. E) NH4– Answer: A Difficulty: 1 Easy Topic: Components of Matter Bloom’s: 1. Remember Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 26) The formula for the bicarbonate ion is: 1. A) C2O32– 2. B) CO32– 3. C) HCO32– 4. D) HCO3– 5. E) C2O42– Answer: D Difficulty: 1 Easy Topic: Components of Matter Bloom’s: 1. Remember Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 27) The formula for the phosphate ion is: 1. A) PO32– 2. B) PO34– 3. C) PO33– 4. D) PO42– 5. E) PO43– Answer: E Difficulty: 1 Easy Topic: Components of Matter Bloom’s: 1. Remember Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 28) The formula for the acetate ion is: 1. A) CH3CO2– 2. B) CH2CO3– 3. C) CH3CO22– 4. D) CH3CO23– 5. E) CH2CO2– Answer: A Difficulty: 1 Easy Topic: Components of Matter Bloom’s: 1. Remember Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 29) The formula for the chlorite ion is: 1. A) ClO– 2. B) ClO2– 3. C) ClO3– 4. D) ClO4– 5. E) ClO22– Answer: B Difficulty: 1 Easy Topic: Components of Matter Bloom’s: 1. Remember Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 30) The formula for the chlorate ion is ClO3−. What is the formula for the perchlorate ion? 1. A) ClO4– 2. B) ClO2– 3. C) ClO– 4. D) ClO32– 5. E) PClO3– Answer: A Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 31) The formula for the bromate ion is BrO3−. What is the formula for the bromite ion? 1. A) BrO4− 2. B) BrO2− 3. C) BrO− 4. D) BrO32− 5. E) Br− Answer: B Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 32) The formula for the iodate ion is IO3–. What is the formula for the hypoiodite ion? 1. A) IO4– 2. B) IO2– 3. C) IO– 4. D) IO32– 5. E) I– Answer: C Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 33) Based on common charges, which formula for an ionic compound is incorrect? 1. A) CaCl 2. B) NaF 3. C) SrO 4. D) MgS 5. E) K3P Answer: A Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Nomenclature Accessibility: Keyboard Navigation 34) Based on common charges, which formula for an ionic compound is incorrect? 1. A) Ba(NO3)2 2. B) Ca(OH)2 3. C) MgCl3 4. D) Al2O3 5. E) KBr Answer: C Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 35) Based on common charges, which formula for an ionic compound is incorrect? 1. A) Li2S 2. B) CaO 3. C) Na3N 4. D) K2Cl 5. E) Mg(OH)2 Answer: D Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 36) Based on common charges, which formula for an ionic compound is incorrect? 1. A) NaClO3 2. B) Sr(NO3)2 3. C) AlCl3 4. D) KI 5. E) MgBr Answer: E Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 37) Based on common charges, which formula for an ionic compound is incorrect? 1. A) LiCO3 2. B) NaBr 3. C) CaO 4. D) SrS 5. E) MgCl2 Answer: A Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 38) Which of the following formulas for a compound containing the Fe2+ ion is incorrect? 1. A) FeO 2. B) FeCl 3. C) FeS 4. D) FeSO4 5. E) Fe(NO3)2 Answer: B Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 39) Which of the following formulas for a compound containing the Cu2+ ion is incorrect? 1. A) Cu(NO3)2 2. B) CuS 3. C) CuN 4. D) CuSO4 5. E) CuSO3 Answer: C Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 40) Which of the following formulas for a compound containing the Fe3+ ion is incorrect? 1. A) FeS 2. B) Fe2S3 3. C) FeN 4. D) FePO4 5. E) FeBr3 Answer: A Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 41) Which of the following formulas for a compound containing the Cu2+ ion is incorrect? 1. A) CuO 2. B) CuP 3. C) CuCO3 4. D) CuSO4 5. E) CuCl2 Answer: B Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 42) Which of the following formulas for a compound containing the Cr3+ ion is incorrect? 1. A) Cr(OH)3 2. B) Cr2(SO4)3 3. C) CrN 4. D) CrNO3 Answer: D Difficulty: 1 Easy Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 43) Which of the following formulas for a compound containing the Cr2+ ion is incorrect? 1. A) CrClO4 2. B) CrSO4 3. C) CrO 4. D) CrS 5. E) CrCl2 Answer: A Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 44) What is the formula for a compound composed of Cr3+ ions and SO32- ions? 1. A) CrSO3 2. B) Cr2(SO3)3 3. C) Cr3(SO3)2 4. D) Cr(SO3)2 5. E) Cr(SO3)3 Answer: B Difficulty: 1 Easy Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 45) What is the formula for a compound composed of Ca2+ ions and PO43− ions? 1. A) CaPO4 2. B) Ca2(PO4)3 3. C) Ca3(PO4)2 4. D) Ca(PO4)2 5. E) Ca(PO4)3 Answer: C Difficulty: 1 Easy Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation 46) The images in the figure represent aqueous solutions of ionic compounds. Which could correspond to BaCl2? 1. A) I only 2. B) II only 3. C) III only 4. D) I and III 5. E) II and III Answer: C Difficulty: 1 Easy Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Ions in Water Accessibility: Keyboard Navigation 47) The images in the figure represent aqueous solutions of ionic compounds. Which could correspond to Na2S? 1. A) I only 2. B) II only 3. C) III only 4. D) I and III 5. E) II and III Answer: A Difficulty: 1 Easy Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions; Ions in Water Accessibility: Keyboard Navigation 48) What is the correct formula for the compound formed between iron(III) ion and the oxide ion? 1. A) FeO 2. B) Fe2O3 3. C) Fe3O2 4. D) Fe3O4 5. E) FeO3 Answer: B Difficulty: 2 Medium Topic: Components of Matter Bloom’s: 2. Understand Gradable: automatic Subtopic: Elements and the Periodic Table; Chemical Formulas; Molecules and Ions Accessibility: Keyboard Navigation Introduction to Chemistry, 5e (Bauer) Chapter 5 Chemical Reactions and Equations 1) Xenon gas reacts with fluorine gas to form xenon tetrafluoride. Identify which image in the figure represents the reactants and which image therefore represents the products in the correct ratio so that mass is conserved. 1. A) Image B = reactants, Image A = products 2. B) Image C = reactants, Image A = products 3. C) Image A = reactants, Image B = products 4. D) Image A = reactants, Image C = products 5. E) Image A = reactants, Image D = products Answer: D Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 2. Understand Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 2) Ozone gas (O3) reacts with carbon monoxide gas to form oxygen gas and carbon dioxide gas. Identify which image in the figure represents the reactants and which image therefore represents the products in the correct ratio so that mass is conserved. 1. A) Image A = reactants, Image B = products 2. B) Image B = reactants, Image A = products 3. C) Image C = reactants, Image D = products 4. D) Image A = reactants, Image D = products 5. E) Image A = reactants, Image C = products Answer: C Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 2. Understand Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 3) The figure shows the chemical reaction between nitrogen gas and hydrogen gas to produce ammonia (NH3) gas. Which of the following changes would make the diagram correctly represent conservation of mass? 1. A) Add one H2molecule from the image on the left. 2. B) Add three NH3molecules to the image on the right. 3. C) Add three H2molecules to the image on the right. 4. D) Remove one H2molecules from the image on the left. 5. E) Remove one NH3molecule from the image on the left. Answer: A Difficulty: 3 Hard Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 4) The figure shows a reaction between methane gas (natural gas, CH4) and oxygen to produce carbon dioxide and water. Is the diagram accurate, and if not, what is wrong with it, and how could it be fixed? 1. A) There are too many hydrogen atoms on the right-hand side of the reaction arrow. Remove one hydrogen atom from each water molecule. 2. B) There are too many oxygen atoms on the right-hand side of the reaction arrow. Remove one oxygen atom from the carbon dioxide. 3. C) The diagram is accurate as shown. 4. D) There are not enough carbon atoms on the left-hand side of the reaction arrow. Add another methane molecule on the left, and then another carbon dioxide molecule on the right of the arrow. 5. E) There are not enough oxygen molecules on the left-hand side of the reaction arrow. Add another oxygen molecule on the left of the arrow, and another water molecule on the right. Answer: C Difficulty: 3 Hard Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 5) The figure shows a reaction between hydrogen and oxygen gases to produce water. Is the diagram accurate, and if not, what is wrong with it, and how could it be fixed? 1. A) There are too many water molecules on the right. Remove one water molecule from the image on the right. 2. B) There are not enough oxygen atoms on the right. Add one more water molecule to the right image. 3. C) There are too many oxygen atoms in the image on the left. Remove one oxygen molecule. 4. D) There are not enough hydrogen and oxygen atoms on the right. Add one more water molecule to the right image, and one more hydrogen molecule to the left image. 5. E) The diagram is accurate as shown. Answer: D Difficulty: 3 Hard Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 6) The figure shows a reaction between xenon gas and fluorine gas. Is the diagram correct, and if not, how could it be modified to show that the law of conservation of mass is obeyed? 1. A) Add one more XeF4molecule, one more O2molecule, and three more Xe atoms to the right image. 2. B) Add four more XeF4molecules to the right image. 3. C) Add three more XeF4molecules and one more Xe atom to the right image. 4. D) Add one more XeF4molecule and three more Xe atoms to the right image. 5. E) The diagram is accurate as shown. Answer: A Difficulty: 3 Hard Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 7) Sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas. Based on the initial reaction mixture, what should be present after the reaction occurs? 1. A) 2 molecules of sulfur trioxide, and 2 molecules of sulfur dioxide 2. B) 4 molecules of sulfur trioxide, and 1 molecule of oxygen 3. C) 3 molecules of sulfur trioxide, and 1 molecule of oxygen 4. D) 3 molecules of sulfur trioxide, and 1 molecule of sulfur dioxide 5. E) 4 molecules of sulfur trioxide Answer: E Difficulty: 3 Hard Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 8) Gaseous nitrogen monoxide reacts with oxygen gas to form brown nitrogen dioxide gas. Based on the initial reaction mixture, what should be present after the reaction occurs? 1. A) 6 molecules of nitrogen dioxide 2. B) 5 molecules of nitrogen dioxide, and 1 molecule of oxygen 3. C) 6 molecules of nitrogen dioxide, and 1 molecule of oxygen 4. D) 4 molecules of nitrogen dioxide, and 2 molecules of nitrogen monoxide 5. E) 3 molecules of nitrogen dioxide, and 3 molecules of nitrogen monoxide Answer: A Difficulty: 3 Hard Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 9) Which of the following changes represents a physical change, rather than evidence of a chemical reaction? 1. A) When a piece of zinc metal is placed in a solution of HCl, bubbles begin to form, and the zinc begins to dissolve. 2. B) When solid ammonium carbonate, (NH4)2CO3, is heated, the solid disappears, and gaseous ammonia (NH3), carbon dioxide (CO2), and water (H2O) are formed. 3. C) When dry ice (solid CO2) is allowed to stand at room temperature, gaseous CO2is formed. 4. D) When a solution of KI is mixed with a solution of Pb(NO3)2, a yellow solid is formed. 5. E) When a piece of copper wire is placed in a solution of AgNO3, a silvery solid begins to form on the surface of the wire, and the solution turns blue. Answer: C Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions; Study of Chemistry Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions; Classification and States of Matter; Properties of Matter Accessibility: Keyboard Navigation 10) Which of the following changes represents a physical change, rather than evidence of a chemical reaction? 1. A) When water and a yellow solution of antifreeze are mixed, the resulting solution is a lighter shade of yellow than the original antifreeze solution. 2. B) When concentrated HNO3is placed in contact with copper metal, a brown gas is formed, the copper dissolves, and a green solution is formed. 3. C) When an egg is fried, the clear part becomes white, and the egg becomes a solid. 4. D) When a piece of zinc metal is placed in a blue solution of copper sulfate, the solution turns from blue to colorless, the zinc dissolves, and copper metal is formed. 5. E) When solutions of AgNO3and NaCl are mixed, a white solid forms. Answer: A Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions; Study of Chemistry Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions; Classification and States of Matter; Properties of Matter Accessibility: Keyboard Navigation 11) In the figure shown, is a chemical reaction occurring? 1. A) No, because there are the same number of atoms in both images. 2. B) Yes, because the atoms have rearranged to form a new substance. 3. C) No, because there are oxygen atoms and nitrogen atoms in both images. 4. D) No, because both the reactants and products are colorless gases. 5. E) Yes, because the reactants are gases, but the product is a solid. Answer: B Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 12) In the figure shown, is a chemical reaction occurring? 1. A) Yes, because the Na+and Cl−ions are being removed from their ionic lattice as they are dissolved. 2. B) Yes, because the water molecules are reacting with the Na+and Cl−ions to form a gas. 3. C) Yes, because a precipitate will be formed when the water and NaCl are mixed. 4. D) No, because there is no change occurring. 5. E) No, because the Na+and Cl−ions are simply being surrounded by the water molecules as the salt dissolves. Answer: E Difficulty: 1 Easy Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 13) In the figure shown, is a chemical reaction occurring? 1. A) No, because there are the same number of atoms in both images. 2. B) Yes, because the atoms have rearranged to form a new substance. 3. C) No, because both the reactants and products are colorless gases. 4. D) No, because there are oxygen atoms and carbon atoms in both images. 5. E) Yes, because the reactants are gases, but the product is a solid. Answer: B Difficulty: 1 Easy Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 14) Consider the following chemical equations. Select the equations that represent chemical reactions, rather than physical changes. 1. CH4(g) + O2(g) → CO2(g) + H2O(g) 2. C2H5OH(l) → C2H5OH(g) III. NaOH(s) → Na+(aq) + OH−(aq) 1. A) I and III only 2. B) II and III only 3. C) I, II, and III 4. D) I only 5. E) I and II only Answer: D Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions; Study of Chemistry Bloom’s: 2. Understand Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions; Classification and States of Matter; Properties of Matter Accessibility: Keyboard Navigation 15) Consider the following chemical equations. Select the equations that represent chemical reactions, rather than physical changes. 1. 2NO(g) + O2(g) → 2NO2(g) 2. CO2(s) → CO2(g) III. Pb(NO3)2(aq) + 2AgCl(aq) → PbCl2(s) + 2AgNO3(aq) 1. A) I, II, and III 2. B) I and II only 3. C) I and III only 4. D) I only 5. E) II and III only Answer: C Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions; Study of Chemistry Bloom’s: 2. Understand Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions; Classification and States of Matter; Properties of Matter Accessibility: Keyboard Navigation 16) Consider the following chemical equations. Select the equations that represent chemical reactions, rather than physical changes. 1. KNO3(s) → K+(aq) + NO3−(aq) 2. 2O3(g) → 3O2(g) III. HCl(g) + NH3(g) → NH4Cl(s) 1. A) II only 2. B) I, II, and III 3. C) I and III only 4. D) I and II only 5. E) II and III only Answer: E Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions; Study of Chemistry Bloom’s: 2. Understand Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions; Classification and States of Matter; Properties of Matter Accessibility: Keyboard Navigation 17) Which of the following is the complete, balanced equation for the reaction that occurs when sodium metal reacts with water to form hydrogen gas and aqueous sodium hydroxide? 1. A) Na(s) + 2H2O(l) → 2NaOH(aq) + 2H2(g) 2. B) Na(s) + 2H2O(l) → NaOH(aq) + 2H2(g) 3. C) Na(s) + H2O(l) → NaOH(aq) + H2(g) 4. D) Na(s) + H2O(l) → NaOH(aq) + H(g) 5. E) 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) Answer: E Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 18) Fireworks which give off bright flashes of white light often contain magnesium metal. When the magnesium burns in the presence of oxygen, it forms solid magnesium oxide, and emits a bright white light. Which of the following is the complete, balanced equation for this reaction? 1. A) Mg(s) + O(g) → MgO(s) 2. B) 4Mg(s) + O2(g) → 2Mg2O(s) 3. C) 2Mg(s) + O2(g) → 2MgO(s) 4. D) Mg(s) + O2(g) → MgO2(s) 5. E) Mg(s) + O2(g) → MgO(s) Answer: C Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 19) Zinc metal will react with aqueous hydrochloric acid to produce aqueous zinc chloride and hydrogen gas. Which of the following is the complete, balanced equation for this reaction? 1. A) Zn(s) + 2HCl(aq) → ZnCl(aq) + H2(g) 2. B) Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g) 3. C) Zn(s) + HCl(aq) → ZnCl(aq) + H(g) 4. D) 2Zn(s) + 2HCl(aq) → 2ZnCl(aq) + H2(g) 5. E) Zn(s) + HCl(aq) → ZnCl(aq) + H2(g) Answer: B Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 20) When solid ammonium carbonate is heated, it decomposes to form ammonia gas, carbon dioxide gas, and water vapor, so that the solid completely disappears. Which of the following is the complete, balanced equation for this reaction? 1. A) (NH4)2CO3(s) → 2NH3(g) + CO2(g) + H2O(g) 2. B) (NH4)2CO3(s) → NH3(g) + CO2(g) + 3H2O(g) 3. C) NH4CO3(s) → NH2(g) + CO2(g) + H2O(g) 4. D) NH4CO3(s) → NH3(g) + CO2(g) + H2O(g) 5. E) (NH4)2CO3(s) → NH3(g) + CO2(g) + H2O(g) Answer: A Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 21) Which of the following is a balanced equation with lowest whole number coefficients that represents the reaction shown in the figure? 1. A) 2N2+ 6Cl2→ 3NCl4 2. B) N2+ 3Cl2→ 2NCl3 3. C) 2N2+ 6Cl2→ 4NCl3 4. D) N2+ 6Cl2→ 4NCl3 5. E) 2N2+ 5Cl2→ 3NCl3 Answer: B Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 22) Which of the following is a balanced equation with lowest whole-number coefficients that represents the reaction shown in the figure? 1. A) 2CH3+ 3O2→ 2CO2 + 3H2O 2. B) CH4+ 2O2→ CO2 + 2H2O 3. C) 3CH3+ 6O2→ 3CO2 + 6H2O 4. D) 3CH4+ 5O2→ 3CO2 + 5H2O 5. E) CH4+ O2→ CO + H2O Answer: B Difficulty: 1 Easy Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 23) The gases carbon dioxide and hydrogen can react together to form carbon monoxide gas and water vapor. Which of the diagrams in the figure could be used to represent this reaction? 1. A) D 2. B) A 3. C) B 4. D) none of these 5. E) C Answer: A Difficulty: 1 Easy Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 24) Balance the following skeletal equation: C3H8(g) + O2(g) → CO2(g) + H2O(g). 1. A) C3H8(g) + O2(g) → 3CO2(g) + 4H2O(g) 2. B) C3H8(g) + O2(g) → 3CO2(g) + 2H2O(g) 3. C) C3H8(g) + 3O2(g) → 3CO2(g) + 4H2O(g) 4. D) C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g) 5. E) C3H8(g) + 4O2(g) → 3CO2(g) + 4H2O(g) Answer: D Difficulty: 3 Hard Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 25) Balance the following skeletal equation: C2H5OH(l) + O2(g) → CO2(g) + H2O(g). 1. A) C2H5OH(l) + O2(g) → CO2(g) + 3H2O(g) 2. B) C2H5OH(l) + 2O2(g) → 2CO2(g) + 3H2O(g) 3. C) C2H5OH(l) + O2(g) → 2CO2(g) + 3H2O(g) 4. D) C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g) 5. E) 2C2H5OH(l) + 3O2(g) → 4CO2(g) + 3H2O(g) Answer: D Difficulty: 3 Hard Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 26) Balance the following skeletal equation: Li(s) + H2O(l) → LiOH(aq) + H2(g). 1. A) Li(s) + H2O(l) → LiOH(aq) + H2(g) 2. B) 2Li(s) + 2H2O(l) → 2LiOH(aq) + H2(g) 3. C) Li(s) + 2H2O(l) → LiOH(aq) + H2(g) 4. D) Li(s) + 2H2O(l) → 2LiOH(aq) + 2H2(g) 5. E) Li(s) + 2H2O(l) → 2LiOH(aq) + H2(g) Answer: B Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 27) Balance the following skeletal equation: NH3(g) + O2(g) → NO2(g) + H2O(g). 1. A) NH3(g) + O2(g) → NO2(g) + 2H2O(g) 2. B) NH3(g) + O2(g) → NO2(g) + H2O(g) 3. C) 2NH3(g) + 2O2(g) → 2NO2(g) + 3H2O(g) 4. D) 4NH3(g) + 7O2(g) → 4NO2(g) + 6H2O(g) 5. E) 2NH3(g) + O2(g) → NO2(g) + 2H2O(g) Answer: D Difficulty: 3 Hard Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 28) Balance the following skeletal equation: CH4(g) → C2H2(g) + H2(g). 1. A) 4CH4(g) → 2C2H2(g) + 5H2(g) 2. B) 2CH4(g) → C2H2(g) + 3H2(g) 3. C) CH4(g) → C2H2(g) + H2(g) 4. D) 2CH4(g) → C2H2(g) + H2(g) 5. E) 2CH4(g) → C2H2(g) + 2H2(g) Answer: B Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 29) Balance the following skeletal equation: Pb(NO3)2(aq) + KI(aq) → PbI2(s) + KNO3(aq) 1. A) Pb(NO3)2(aq) + KI(aq) → PbI2(s) + KNO3(aq) 2. B) Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) 3. C) Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + KNO3(aq) 4. D) 2Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 4KNO3(aq) 5. E) 2Pb(NO3)2(aq) + 2KI(aq) → 2PbI2(s) + 4KNO3(aq) Answer: B Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 30) Balance the following skeletal equation: Ba(NO3)2(aq) + K2SO4(aq) → BaSO4(s) + KNO3(aq) 1. A) 2Ba(NO3)2(aq) + 2K2SO4(aq) → 2BaSO4(s) + 2KNO3(aq) 2. B) 2Ba(NO3)2(aq) + K2SO4(aq) → 2BaSO4(s) + KNO3(aq) 3. C) Ba(NO3)2(aq) + K2SO4(aq) → BaSO4(s) + 2KNO3(aq) 4. D) 2Ba(NO3)2(aq) + 2K2SO4(aq) → 2BaSO4(s) + 3KNO3(aq) 5. E) Ba(NO3)2(aq) + K2SO4(aq) → BaSO4(s) + KNO3(aq) Answer: C Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 31) Balance the following skeletal equation: HCl(g) + O2(g) → H2O(l) + Cl2(g) 1. A) 2HCl(g) + O2(g) → 2H2O(l) + Cl2(g) 2. B) HCl(g) + O2(g) → H2O(l) + Cl2(g) 3. C) 2HCl(g) + O2(g) → H2O(l) + Cl2(g) 4. D) 4HCl(g) + O2(g) → 2H2O(l) + 2Cl2(g) Answer: D Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 32) After the following equation is properly balanced, what is the coefficient in front of O2? S8(s) + O2(g) → SO3(g) 1. A) 12 2. B) 8 3. C) 16 4. D) 3 5. E) 2 Answer: A Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 33) After the following equation is properly balanced, what is the coefficient in front of O2(g)? PbS(s) + O2(g) → PbO(s) + SO2(g) 1. A) 1 2. B) 2 3. C) 6 4. D) 4 5. E) 3 Answer: E Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 34) When the equation shown is balanced properly, what is the coefficient in front of O2(g)? C6H14(l) + O2(g) → CO2(g) + H2O(g) 1. A) 6 2. B) 19 3. C) 9 4. D) 12 5. E) 7 Answer: B Difficulty: 3 Hard Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Writing and Balancing Chemical Reactions Accessibility: Keyboard Navigation 35) When aqueous solutions of hydrochloric acid and sodium carbonate are mixed, 1. A) CO2gas is produced. 2. B) a precipitate is formed. 3. C) no reaction occurs. 4. D) H2gas is formed. 5. E) sodium metal is formed. Answer: A Difficulty: 2 Medium Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Types of Chemical Reactions Accessibility: Keyboard Navigation 36) A reaction which has two elements as reactants and one compound as a product is 1. A) a single-displacement reaction. 2. B) a decomposition reaction. 3. C) a combustion reaction. 4. D) a double-displacement reaction. 5. E) a combination reaction. Answer: E Difficulty: 1 Easy Topic: Stoichiometry and Chemical Reactions Bloom’s: 2. Understand Gradable: automatic Subtopic: Types of Chemical Reactions Accessibility: Keyboard Navigation 37) A reaction which has one element and one compound as reactants and one element and one compound as products is 1. A) a double-displacement reaction. 2. B) a combination reaction. 3. C) a decomposition reaction. 4. D) a combustion reaction. 5. E) a single-displacement reaction. Answer: E Difficulty: 1 Easy Topic: Stoichiometry and Chemical Reactions Bloom’s: 3. Apply Gradable: automatic Subtopic: Types of Chemical Reactions Accessibility: Keyboard Navigation 38) A reaction which has one compound as a reactant and two elements as products is 1. A) a decomposition reaction. 2. B) a combustion reaction. 3. C) a single-displacement reaction. 4. D) a combination reaction. 5. E) a double-displacement reaction. Answer: A Difficulty: 1 Easy Topic: Stoichiometry and Chemical Reactions Bloom’s: 2. Understand Gradable: automatic Subtopic: Types of Chemical Reactions Accessibility: Keyboard Navigation Show Less