Chemistry A Final Exam questions and answers 100% verified.

Chemistry A Final Exam questions and answers 100% verified. What describes metallic compounds? Select all that apply. - correct a solid state, they usually conduct electricity they generally have high melting points Using the electron configuration, how many valence electrons does sulfur (S) have? HINT: Sulfur's atomic number is 16. - correct answers.S: 1s222s222p663s223p44 Since there are two electrons in 3s and four electrons in 3p, there are six valence electrons. Oxygen has six valence electrons, and an electronegativity of 3.44. Calcium has two valence electrons and an electronegativity of 1.00. How can the octet rule be used to explain the bonding between them? - correct answers.Oxygen needs access to two electrons to reach a full octet. Each calcium atom has two valence electrons that it prefers to lose to obtain a full octet. Therefore, one oxygen atom and one calcium atom complement each other and form an ionic bond. How does the octet rule apply to ionic and covalent bonds? Select all that apply. - correct answers.Carbon with 4 valence electrons can satisfy the octet rule by sharing one electron with four different hydrogen atoms, each with 1 valence electron. Chlorine with 7 valence electrons can satisfy the octet rule by gaining one electron from a lithium atom with only 1 valence electron. The Haber process for commercially producing ammonia is represented by the equation N22(g) + 3H22(g) → 2NH33(g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required? - correct answers.3 What is the correct coefficient for Fe2O3 in the balanced version of the following equation? Fe22O33 + 3H22 → 2Fe + 3H22O - correct answers.XXX 2 What is the proper Lewis structure for an atom of phosphorus with electron configuration 1s22 2s22 2p66 3s22 3p44? - correct answers.XXX The letter P with 1 dot to its right, one dot to its left, one dot above it, and 1 dot below it. What is true about neutrons within an atom? Select all that apply. - correct are found within the nucleus of the atom XXX their number in an atom is equal to the atomic number The electron configuration of nitrogen is 1s22 2s22 2p33. How many more electrons does nitrogen need to satisfy the octet rule? Write the answer as a whole number and do not include a unit label or other information. - correct answers.3 What is the correct coefficient for HNO3 in the balanced version of the following equation?HNO33 + P22O55 → N22O55 + HPO3 - correct answers.2 Review the balanced equation and lab scenario. 2C1010H1111NO44 + 2H22O → C1616H1010N22O22 + 2C22H44O22 + 4H22O In this reaction, 1.87 g of indigo (C1616H1010N22O22) are produced. If the theoretical yield is 2.35 g of C1616H1010N22O22, what is the percent yield of indigo? Round to the nearest decimal. - correct answers.79.6 Which of the following correctly shows a synthesis reaction involving potassium? - correct answers.XXX Br2 + 2KI → I2 + 2KBr The following molecules contain polar bonds. The only polar molecule is - correct answers.NH3- Pat wants to balance the following chemical equation:Fe +H2O → Fe3O4+H2 What is the logical first step? - correct answers.Add a coefficient of 3 in front of the reactant Fe What are properties of ionic compounds? Select all that apply. - correct al lattice structure high melting and boiling points Which of the following describes the bond that will form between the two atoms? - correct answers.Ionic: an electron will be transferred from the potassium to the chlorine atom What is the difference between electronegativity and ionization energy? - correct answers.Electronegativity describes how easily an atom can gain an electron and ionization energy describes how easily an atom will lose an electron. What types of compounds are held together by shared electron pairs? - correct ent During a lab experiment, 26 mol of BaF22 are combined with 50 mol of NaNO33. BaF22 + 2NaNO33 → Ba(NO33)22 + 2NaF What is the limiting reactant? - correct answers.XXX NaF What is the molecular mass of NH44Cl? Round the answer to 3 decimal places. Answer should not include a unit label or other information. - correct answers.XXX 53.491