elements

Questions 7 - 8: a) a network solid with covalent bonding b) a molecular solid with London dispersion forces only c) a molecular solid with hydrogen bonding d) an ionic solid e) a metallic solid 7) solid ethyl alcohol, Csub2Hsub5OH. Ans A, B, C, D or E 8) silicon dioxide, SiOsub2. Ans A, B, C, D or E

solutions

Questions 9 - 11: a) COsub3^2- b) MnOsub4^- c) NHsub4^+ d) Ba^2+ e) Al^3+ Assume that you have several unknowns each consisting of an aqueous solution of a salt that contains one of the ions listed above, which ion must be present if the following observations are made of that unknown? 9) the solution is colored. Ans A, B, C, D or E 10) An odar can be detected when a sample of solution is added drop by drop to a warm solution of sodium hydroxide. Ans A, B, C, D or E 11) a precipitate is formed when a dilute solution of Hsub2SOsub4 is added to a sample of the solution. Ans A, B, C, D or E

spontaneous reaction

Questions 12-13: The spontaneous reaction that occurs when the cell above operates is 2 Ag^+ + Cd(s) -> 2 Ag(s) + Cd^2+ a) voltage increases b )voltage decreases by remains but remains above zero c) voltage becomes zero and remains remains at 0. d) no change in voltage occurs. e) direction of voltage change cannot be predicted without additional information Which of the above occurs for each of the following circumstances 12) The silver electrode is made larger. Ans A, B, C, D or E 13) The salt bridge is replaced by platinum wire. Ans A, B, C, D or E

electrons shells, etc.

Directions: Each of the questions or incomplete statements below is followed by five suggested answers or completions. Suggest or select the one that is best in each case. 14) Hydrogen halide Normal Boiling Point, C HF +19 HCl -85 HBr -67 HI -35 The liquified hydrogen halides have the normal boiling points above. The relatively high boiling point of HF Can be correctly explained by which the following. a) hf gas is more ideal b) hf is the strongest acid c) hf moleculs ahve a smaller dipole moment d) hf is much less soluble in water e) hf molecules tend to form hydrogen bonds 1s^2 2s^2 2p^6 3s^2 3p^3 15) Atoms of an element X have the electronic... click for more

oxidation

Questions 17 - 18: Hsub3AsOsub4 + 3I^- + 2Hsub3O^+ -> Hsub3AsOsub3 + Isub3^- + 3Hsub2O The oxidation of iodide ions by arsenic acid in acidic aqueous solution occured accoring to the balanced equation above. The experimental rate law for the reaction at 25 degree C is: 17) what is the order of the reaction with respect to I^-? 18) according to the rate law for the reaction an increase in concentration of the Hydronium has what effect on the reaction at 25 degree C. a) the rate of reaction increases b) the rate of reaction decreases c) the value of the equilibrium constant increases d) the value of the equilibrium constant decreases e) Niether the rate no... click for more