General, Organic, and Biological Chemistry Practice Exam Questions And Answers

Chapter 1: Chemistry and Measurements 1) The measurement 0.000 0043 m, expressed correctly using scientific notation, is A) 4.3 × 10-7 m. B) 4.3 × 10-6 m. C) 4.3 × 106 m. D) 0.43 × 10-5 m. E) 4.3 m. 2) Which of the following numbers contains the designated CORRECT number of significant figures? A) 0.04300 5 significant figures B) 0.00302 2 significant figures C) 156 000 3 significant figures D) 1.04 2 significant figures E) 3.0650 4 significant figures 3) Which of the answers for the following conversions contains the correct number of significant figures?.. Chapter 2: Energy and Matter 23) When a solid is converted directly to a gas, the change of state is called A) freezing. B) melting. C) boiling. D) condensation. E) sublimation. 24) In a gas, the distance between the particles is A) very close relative to the size of the molecules. B) close relative to the size of the molecules. C) fixed relative to the size of the molecules. D) small relative to the size of the molecules. E) very large relative to the size of the molecules. 25) Helium is a(n) A) compound. B) heterogeneous mixture. C) element. D) homogeneous mixture. E) electron. 26) Air is a(n) A) compound. B) heterogeneous mixture. C) element. D) homogeneous mixture. E) None of the above. 27) Which of the following is a chemical change?... Chapter 3: Atoms and Elements 39) Which of the following elements is a metal? A) nitrogen B) fluorine C) argon D) strontium E) phosphorus 40) Which of the following elements is a noble gas? A) oxygen B) chlorine C) bromine D) argon E) nitrogen 41) The element in this list with chemical properties similar to magnesium is... Chapter 4: Nuclear Chemistry 58) What is the nuclear symbol for a radioactive isotope of copper with a mass number of 60? A) Cu B) Cu C) 29Cu D) Cu E) Cu 59) The nuclear symbol of helium, He, is also the symbol for designating a(n) A) proton. B) neutron. C) gamma ray. D) beta particle. E) alpha particle. 60) The symbol e is a symbol used for a(n)... Chapter 5: Compounds and their Bonds 67) How many electrons will aluminum gain or lose when it forms an ion? A) lose 1 B) gain 5 C) lose 2 D) lose 3 E) gain 1 68) What is the symbol for the ion with 19 protons and 18 electrons? A) F+ B) FC) Ar+ D) KE) K+ 69) The correct formula for a compound formed from the elements Al and O is... Chapter 6: Chemical Reactions and Quantities 93) Which of the following gives the balanced equation for this reaction? K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + KNO3 A) KPO4 + CaNO3 + KNO3 B) K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + 3KNO3 C) 2K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + 6KNO3 D) 2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2 + 6KNO3 E) K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + KNO3 94) The following reaction takes place when an electric current is passed through water. It is an example of a reaction. 2 H2O → 2H2 + O2... Chapter 8: Solutions 116) Which of the following molecules can form hydrogen bonds? A) CH4 B) NaH C) NH3 D) BH3 E) HI 117) A solution is prepared by dissolving 2 g of KCl in 100 g of H2O. In this solution, H2O is the A) solute. B) solvent. C) solution. D) solid. E) ionic compound... Chapter 9: Reaction Rates and Chemical Equilibrium 133) In any chemical reaction, the rate of the reaction can be increased by A) decreasing the temperature. B) changing the size of the container. C) adding water to the reaction. D) adding product molecules to the reaction mixture. E) increasing the concentrations of the reactants. 134) A catalyst is A) a reactant in a chemical reaction. B) a product in a chemical reaction. C) a substance that speeds up a reaction without being consumed in the reaction. D) a substance that increases the energy of the products. E) a substance that decreases the energy of the products. 135) The activation energy of a chemical reaction is the energy that... Chapter 10: Acids and Bases 142) According to the Arrhenius concept, if NaOH were dissolved in water, it would act as A) a base. B) an acid. C) a source of hydronium ions. D) a source of H- ions. E) a proton donor. 143) According to the Arrhenius concept, if HNO3were dissolved in water, it would act as A) a base. B) an acid. C) a source of hydroxide ions. D) a source of H- ions. E) a proton acceptor. 144) The name given to an aqueous solution of HBr is...Answers: 46) D 92) A 138) B 1) B 47) D 93) D 139) A 2) C 48) A 94) D 140) B 3) C...