Memorial Day Comprehensive Chemistry Homework

62) Solubility data for four different salts in water at 60DC are shown in the table below.1226 - 1 - Page 6Which salt is most soluble at 60DC?A) A B) B C) C D) D63) At room temperature, the solubility of which solute in water would be most affected by a change in pressure?A) carbon dioxide B) sugar C) methanol D) sodium nitrate64) What is the molarity of a solution of NaOH if 2 liters of the solution contains 4 moles of NaOH?A) 8 M B) 2 M C) 80 M D) 0.5 M65) A student wants to prepare a 1.0-liter solution of a specific molarity. The student determines that the mass of the solute needs tobe 30. grams. What is the proper procedure to follow?A) Add 30. g of solute to 970. mL of solvent to make 1.0 L of solution.B) Add enough solvent to 30. g of solute to make 1.0 L of solution.C) Add 1,000. g of solvent to 30. g of solute.D) Add 30. g of solute to 1.0 L of solvent.66) One hundred grams of water is saturated with NH 4Cl at 50DC. According to the Solubility Curves chemistry reference table, ifthe temperature is lowered to 10DC, what is the total amount of NH 4Cl that will precipitate?A) 5.0 g B) 30. g C) 17 g D) 50. g67) Adding a catalyst to a chemical reaction results inA) an increase in activation energy and a decrease in the reaction rateB) an increase in activation energy and an increase in the reaction rateC) a decrease in activation energy and a decrease in the reaction rateD) a decrease in activation energy and an increase in the reaction rate68) Which process is accompanied by a decrease in entropy?A) subliming of iodineB) boiling of water69) Given the equation:C) condensing of water vaporD) melting of iceKNO 3(s)KNO 3(aq)As H 2O(l) is added to KNO 3(s) to form KNO 3(aq), the entropy of the systemA) increases B) remains the same C) decreases70) Which statement must be true about a chemical system at equilibrium?A) The rate of the forward reaction is equal to the rate of the reverse reaction.B) The number of moles of reactants is equal to the number of moles of product.C) The forward and reverse reactions stop.D) The concentration of reactants and products are equal.71) A solution that is at equilibrium must beA) unsaturated B) saturated C) dilute D) concentrated

72) Given the reaction at equilibrium:1226 - 1 - Page 7N 2(g) + O 2(g) + energy ‰Š‹ 2NO(g)Which change will result in a decrease in the amount of NO(g) formed?A) increasing the temperatureB) decreasing the concentration of N 2 (g)73) Given the system at equilibrium:N 2 O 4 (g) + 58.1 kJ ‰Š‹ 2NO 2 (g)C) decreasing the pressureD) increasing the concentration of O 2 (g)What will be the result of an increase in temperature at constant pressure?A) The equilibrium will shift to the left, and the concentration of NO 2(g) will increase.B) The equilibrium will shift to the right, and the concentration of NO 2(g) will decrease.C) The equilibrium will shift to the left, and the concentration of NO 2(g) will decrease.D) The equilibrium will shift to the right, and the concentration of NO 2(g) will increase.74) Which ion is the only negative ion present in an aqueous solution of an Arrhenius base?A) hydrogen ion B) hydronium ion C) hydride ion D) hydroxide ion75) Which pH indicates a basic solution?A) 7 B) 5 C) 12 D) 176) Which indicator is yellow in a solution with a pH of 9.8?A) methyl orange B) bromthymol blue C) bromcresol green D) thymol blue77) Which equation represents a neutralization reaction?A) Na 2CO 3+ CaCl 2 ‚ 2NaCl + CaCO 3B) Ni(NO 3 ) 2 + H 2 S ‚ NiS + 2HNO 3C) NaCl + AgNO 3 ‚ AgCl + NaNO 3D) H 2 SO 4 + Mg(OH) 2 ‚ MgSO 4 + 2H 2 O78) In which compound does chlorine have the highest oxidation number?A) NaClO 4B) NaClO C) NaClO 2D) NaClO 379) What is the oxidation state of nitrogen in NaNO 2?A) +1 B) +2 C) +3 D) +480) Given the redox reaction:Cr 3+ + Al ‚ Cr + Al 3+As the reaction takes place, there is a transfer ofA) electrons from Cr 3+ to AlC) protons from Cr 3+ to AlB) electrons from Al to Cr 3+ D) protons from Al to Cr 3+81) Given the balanced ionic equation:Zn(s) + Cu 2+ (aq) ‚ Zn 2+ (aq) + Cu(s)Which equation represents the oxidation half-reaction?A) Zn(s) ‚ Zn 2+ (aq) + 2e -B) Zn(s) + 2e - ‚ Zn 2+ (aq)C) Cu 2+ (aq) ‚ Cu(s) + 2e -D) Cu 2+ (aq) + 2e - ‚ Cu(s)

82) Which structural formula is incorrect?1226 - 1 - Page 8A)C)B)D)83) Which compound is an isomer of pentane?A) propane B) butane C) methyl butane D) methyl propane84) Which formula represents an unsaturated hydrocarbon?A) C 2H 6B) C 3H 8C) C 6H 14D) C 5H 885) What is the name of the process in which the nucleus of an atom of one element is changed into the nucleus of an atom of adifferent element?A) substitution B) transmutation C) decomposition D) reduction86) The stability of an isotope is based on itsA) number of neutrons, onlyB) number of protons, only87) Which reaction represents natural nuclear decay?A)C) ratio of neutrons to protonsD) ratio of electrons to protonsC)B)D)88) Which of the following particles has the greatest mass?A) beta B) alpha C) neutron D) positron