Chem 104 Final 145 Correctly Answered Questions Latest Update

When solutions of sodium sulfide and copper(II) sulfate are mixed, a precipitate of copper(II) sulfide is formed. What is the net ionic equation for this reaction? {Ans: Cu2+(aq) + S2-(aq) → CuS(s)}Diamond is a pure form of the element carbon. If a 2 carat diamond has a mass of 0.396 g, how many carbon atoms are contained in this diamond? {Ans: 1.99 × 1022 atoms}Which of the following statements concerning a voltaic cell is FALSE? {Ans: The oxidation half reaction occurs at the cathode.}A covalent bond involves which of the following? {Ans: sharing of electrons between two atoms}A patient needs 0.300 g of a solid drug preparation per day. How many 10.0 mg tablets must be given to the patient per day? {Ans: 30.0 tablets}Choose the best classification of the reaction represented by the following equation: C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(l) {Ans: combustion}Iron reacts with oxygen to form iron(III) oxide according to the chemical equation below. What is the theoretical yield of product when 5.00 grams of Fe react with excess O2? [Molar masses: Fe, 55.85 g/mol; O, 16.00g/mol] 4Fe(s) + 3O2(g) → 2Fe2O3(s) {Ans: 7.15 g}Incomplete combustion occurs when there