Chapter 7 Practice Questions

43) Which is a spectator ion from the following complete ionic equation: H+(aq) + Br-(aq) + K+ (aq) + OH-(aq) → H2O(l) + K+(aq) + Br- (aq) A) K+ B) H+ C) OH- D) H2O E) none of the above

A) K+

35) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which compound would not form ions in the complete ionic equation? A) PbI2 B) KNO3 C) Pb(NO3)2 D) KI E) All compounds form ions in the complete ionic equation.

A) PbI2

1) The mixing of sodium metal and chlorine gas would be the type of reaction known as: A) oxidation-reduction B) gas evolution C) neutralization D) precipitation E) none of the above

A) oxidation-reduction

46) What type of a reaction occurs when a silver nitrate solution is mixed with sodium chloride solution? A) precipitation B) acid-base neutralization C) oxidation-reduction D) gas evolution E) no reaction

A) precipitation

63) What type of reaction is the generic equation A + B > AB? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

A) synthesis/combination

15) What are the coefficients for the following reaction when it is properly balanced? ___potassium iodide + ___lead (II) acetate → ___lead (II) iodide +___potassium acetate A) 2, 1, 1, 1 B) 2, 1, 1, 2 C) 3, 2, 2, 1 D) 1, 1, 2, 2 E) none of the above

B) 2, 1, 1, 2

34) What would be the formula of the precipitate that forms when Pb(NO3)2 (aq) and K2SO4 (aq) are mixed? A) K(NO3)2 B) PbSO4 C) PbK2 D) H2O E) none of the above

B) PbSO4

66) What type of reaction is the generic equation AB > A+B? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

B) decomposition

44) Which of the following everyday substances does NOT typically contain an acid? A) lemons B) vinegar C) soap D) limes E) all of the above

C) soap

69) Which statement about ozone is TRUE? A) Ozone normally forms in the upper atmosphere. B) Chlorofluorocarbons deplete the ozone layer. C) Ozone protects life on Earth from harmful ultraviolet light. D) None of the above statements are true. E) All the of the first three statements are true.

E) All the of the first three statements are true.

56) As defined in the text, identify the "gas evolution" reactions among the following: 1. 2HCl(aq) + K2CO3(aq) → H2O(l) + CO2(g) + 2KCl(aq) 2. CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) 3. 2HCl(aq) + K2S(aq) → H2S(g) + 2KCl(aq) A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) All of 1, 2, and 3 E) None of 1, 2, and 3

B) 1 and 3 only

2) When the equation, ___O2 + ___C6 H14 → ___CO2 + ___H2O is balanced, the coefficient of O2 is: A) 3 B) 10 C) 19 D) 38 E) none of the above

C) 19

61) Which of the following statements about redox reactions is FALSE? A) Oxidation is the loss of electrons. B) Reduction is the gain of electrons. C) A reaction can result in either oxidation or reduction, not both. D) A reaction involving elemental oxygen is a redox reaction. E) All of the above statement are true.

C) A reaction can result in either oxidation or reduction, not both.

31) In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products? A) (s) B) (g) C) (l) D) (w) E) none of the above

A) (s)

11) What are the coefficients for the following reaction when it is properly balanced? ___HCl + ___Mg → ___MgCl2 + ___H2 A) 2, 1, 1, 1 B) 2, 1, 2, 2 C) 1, 2, 1/2, 1 D) 1, 1, 1, 2 E) none of the above

A) 2, 1, 1, 1

50) What is the complete ionic equation for the reaction of hydrochloric acid with potassium hydroxide? A) H+ + Cl- + K+ + OH- → H2O + K+ + Cl- B) H+ + Cl- + K+ + OH- → 2H+ + O2- + K+ + Cl- C) H+ + OH- → H2O D) 2H+ +2Cl- + K2+ + 2OH- → H2O + K2+ +2 Cl- E) none of the above

A) H+ + Cl- + K+ + OH- → H2O + K+ + Cl-

6) When water is heated, bubbles form in the water. Is this evidence of a chemical reaction? Why? A) No, boiling water is a physical change. B) Yes, the formation of a gas is evidence of a chemical reaction. C) No, the formation of gas bubbles is a secondary chemical reaction which is ignored. D) Yes, the formation of a gas is proof a new compound has been made. E) none of the above

A) No, boiling water is a physical change.

27) The compound sodium sulfate is soluble in water. When this compound dissolves in water, which ion listed below would be present in solution? A) SO42- B) S2- C) O2- D) Na22+ E) none of the above

A) SO42-

23) Which of the following compounds is INSOLUBLE? A) magnesium phosphate B) magnesium sulfate C) magnesium iodide D) magnesium nitrate E) none of the above

A) magnesium phosphate

60) A redox reaction has occurred ________. A) when a substance reacts with elemental oxygen B) when an alkali metal reacts with an alkaline earth metal C) when one substance transfers protons to another D) when one substance forms a solid E) when all of the above occur

A) when a substance reacts with elemental oxygen

59) Methane gas (CH4), on complete combustion in air, produces: 1. CO2 2. H2 3. H2O A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) All of 1 and 2 only E) None

B) 1 and 3 only

30) If you had an aqueous mixture that contained Ag+, K+, and Pb2+ cations, how many different solids could precipitate if a chloride solution was added? A) 1 B) 2 C) 3 D) 4 E) no solids will precipitate

B) 2

16) What are the coefficients for the following reaction when it is properly balanced? ___nitrogen monoxide + ___carbon monoxide → ___nitrogen +___carbon dioxide A) 2, 1, 1, 2 B) 2, 2, 1, 2 C) 2, 2, 2, 1 D) 1, 1, 2, 2 E) none of the above

B) 2, 2, 1, 2

37) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) would NOT be present in the net ionic equation? A) Pb2+, NO3- B) K+, NO3- C) K+, Pb2+ D) K+, I- E) All the above ions are in the net ionic equation.

B) K+, NO3-

7) Which of the following statements about balancing reactions is FALSE? A) If there is no coefficient or subscript, a one is implied. B) When coefficients are added the type of compounds is changed in the chemical reaction. C) Subscripts are multiplied by the coefficients to determine the number of atoms in a compound. D) Coefficients are added to compounds to ensure both sides of the reaction have equal numbers of each atom. E) All of the above statements are true.

B) When coefficients are added the type of compounds is changed in the chemical reaction.

47) What type of a reaction occurs when a sodium hydroxide solution is mixed with an acetic acid solution? A) precipitation B) acid-base neutralization C) oxidation-reduction D) gas evolution E) no reaction

B) acid-base neutralization

3) A reaction in which a substance reacts with oxygen, emitting heat and forming oxygen-containing compounds is an example of a(n): A) acid-base reaction. B) combustion reaction. C) precipitation reaction. D) gas evolution reaction. E) none of the above

B) combustion reaction.

13) What are the coefficients for the following reaction when it is properly balanced? ___Na3PO4 + ___Ba(NO3)2 → ___NaNO3 + ___Ba3(PO4)2 A) 2, 1, 1, 3 B) 2, 3, 1, 6 C) 2, 3, 6, 1 D) 6, 1, 3, 2 E) none of the above

C) 2, 3, 6, 1

9) When the equation, ___N2 + ___H2 → ___NH3 is balanced, the coefficient of hydrogen is: A) 1 B) 2 C) 3 D) 4 E) none of the above

C) 3

18) When the equation __NO2 + __H2O + __O2 → __HNO3 is balanced, the coefficient of HNO3 is: A) 2 B) 3 C) 4 D) 5 E) none of the above

C) 4

17) When the equation __Ca3N2 + __H2O → __Ca(OH)2 + __NH3 is balanced, the coefficient of H2O is: A) 2 B) 3 C) 6 D) 12 E) none of the above

C) 6

48) What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide? A) H+ + Cl- + K+ + OH- → H2O + K+ + Cl- B) HCl + KOH → H2O + KCl C) H+ + OH- → H2O D) 2H+ +2Cl- + K2+ + 2OH- → H2O + K2+ +2 Cl- E) none of the above

C) H+ + OH- → H2O

42) Which is a spectator ion from the following complete ionic equation: Ag+(aq) + NO3-(aq) + K+ (aq) + Br-(aq) → AgBr(s) + K+(aq) + NO3- (aq) A) Ag+ B) Br- C) K+ D) AgBr E) none of the above

C) K+

39) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct complete ionic equation? A) Pb2+ + (NO3)2- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- B) Pb2+ + 2NO3- +2K+ + I- → PbI2(s) + 2K+ + NO3- C) Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- D) Pb2+ + 2NO3- + 2K+ + 2I- → Pb2+ + 2I- + 2K+ + 2NO3- E) none of the above

C) Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3-

52) Which of the following types of compounds will NOT undergo a gas evolution reaction when acid is added? A) sulfides B) carbonates C) hydroxides D) bisulfites E) none of the above

C) hydroxides

57) What type of a reaction occurs when potassium metal reacts with fluorine gas? A) precipitation B) acid-base neutralization C) oxidation-reduction D) gas evolution E) no reaction

C) oxidation-reduction

24) Which of the following compounds is SOLUBLE? A) copper carbonate B) calcium carbonate C) potassium carbonate D) strontium carbonate E) none of the above

C) potassium carbonate

2) A reaction which forms a solid product is an example of a(n): A) oxidation-reduction reaction. B) combustion reaction. C) precipitation reaction. D) gas evolution reaction. E) none of the above

C) precipitation reaction.

64) What type of reaction is the generic equation A + BC → AC + B? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

C) single displacement

8) Before a chemical equation can be written, one must know: A) the atomic mass of all the elements involved. B) the molar mass of all the compounds. C) the symbols and formulas of all reactants and products. D) the number of moles of all reactants and products. E) none of the above.

C) the symbols and formulas of all reactants and products.

14) What are the coefficients for the following reaction when it is properly balanced? ___nitric acid + ___sodium hydroxide → ___sodium nitrate + ___water A) 2, 1, 1, 1 B) 2, 3, 2, 2 C) 5, 2, 2, 1 D) 1, 1, 1, 1 E) none of the above

D) 1, 1, 1, 1

12) What are the coefficients for the following reaction when it is properly balanced? ___O2 + ___CH4 → ___CO2 + ___H2O A) 2, 1, 3, 1 B) 2, 3, 2, 2 C) 1, 3, 2, 1 D) 2, 1, 1, 2 E) none of the above

D) 2, 1, 1, 2

20) Sodium metal reacts with water to form aqueous sodium hydroxide and hydrogen gas. Which equation below best describes the balanced equation for this reaction? A) Na + H2O → NaOH (aq) + H (g) B) S + H2O → SOH (aq) + H (g) C) Na + H2O → NaOH (aq) + H2 (g) D) 2Na + 2H2O → 2NaOH (aq) + H2 (g) E) 2Na + H2O → Na2OH (aq) + H (g)

D) 2Na + 2H2O → 2NaOH (aq) + H2 (g)

19) Which of the following equations is NOT balanced properly? A) 2Cr + 6HCl → 2CrCl3 + 3H2 B) 2NaHCO3 → Na2CO3 + CO2 + H2O C) Cr2(SO4)3 + 6KOH → 2Cr(OH)3 + 3 K2SO4 D) 4NH3 + 14O2 → 4NO2 + 6H2O E) none of the above

D) 4NH3 + 14O2 → 4NO2 + 6H2O

10) When the equation, ___O2 + ___C5H12 → ___CO2 + ___H2O is balanced, the coefficient: of O2 is: A) 3 B) 4 C) 5 D) 8 E) none of the above

D) 8

58) Identify the oxidation-reduction reactions among the following: 1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) 2. 2 Na(s) + Cl2(aq) → 2NaCl(s) 3. 2 Mg(s) + O2(g) → 2 MgO A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) All of 1, 2, and 3 E) None of 1, 2, and 3

D) All of 1, 2, and 3

68) Identify the double displacement reactions among the following: 1. KCl(aq) + AgNO3(aq) → AgCl(s) + KNO3(aq) 2. Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq) 3. H2SO4((aq) + 2NaOH(aq) → Na2SO4((aq) + 2H2O(l) A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) All of 1, 2, and 3 E) None of 1, 2, and 3

D) All of 1, 2, and 3

51) When a solution of MgCl2 and one of AgNO3 are mixed, the net ionic equation is: A) Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) + 2NO3- (aq) → Mg2+(aq) + 2NO3-aq) + 2AgCl(s) B) Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) + 2NO3- (aq) → Mg(NO3)2 (aq) + 2 AgCl(s) C) Mg2+(aq) + 2NO3-(aq) → Mg(NO3)2(aq) D) Cl-(aq) + Ag+(aq) → AgCl(s) E) none of the above

D) Cl-(aq) + Ag+(aq) → AgCl(s)

55) Which of the following would NOT be a product from mixing hydrochloric acid with a solution of sodium sulfite? A) H2O (l) B) SO2 (g) C) NaCl (aq) D) H2 (g) E) none of the above

D) H2 (g)

49) What is the molecular equation for the reaction of hydrochloric acid with potassium hydroxide? A) H2Cl + 2KOH → H2O +2KCl B) 2HCl + K(OH)2 → 2H2O + KCl2 C) H+ + OH- → H2O D) HCl + KOH → H2O + KCl E) none of the above

D) HCl + KOH → H2O + KCl

40) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct net ionic equation? A) Pb2+ + I2- → PbI2(s) B) 2NO3- + 2K+ → 2KNO3 C) Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- D) Pb2+ + 2I- → PbI2(s) E) none of the above

D) Pb2+ + 2I- → PbI2(s)

38) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) would NOT be spectator ions? A) Pb2+, NO3- B) K+, I- C) NO3-, Pb2+ D) Pb2+, I - E) All the above ions are in the net ionic equation.

D) Pb2+, I -

29) Several grams of sodium chloride are stirred into a glass of water and are no longer visible to the eye. Which of the following statements is FALSE? A) The sodium chloride solid has dissociated into its component ions. B) An aqueous solution has been prepared. C) No precipitate has formed. D) Sodium chloride is insoluble in water. E) All of the statements are true.

D) Sodium chloride is insoluble in water.

28) When solid NaCl is stirred into water, which of the following is NOT true? A) Individual sodium and chloride ions are present. B) The solution will conduct electricity. C) The solution will taste salty. D) The NaCl will fail to dissociate. E) none of the above

D) The NaCl will fail to dissociate.

5) Which of the following is NOT typically a sign of a chemical reaction? A) absorbing heat when chemicals are contacted with each other B) emission of heat when chemicals are contacted with each other C) emission of light when chemicals are contacted with each other D) absorbing light when chemicals are contacted with each other E) All of the above are signs of a chemical reaction.

D) absorbing light when chemicals are contacted with each other

62) The reaction CH4 (g) + 2 O2 (g) → CO2 (g) + 2 H2O (g) is: A) a combustion reaction. B) a redox reaction. C) an exothermic reaction. D) all of the above E) none of the above

D) all of the above

25) Which of the following compounds is SOLUBLE? A) aluminum hydroxide B) aluminum sulfide C) aluminum carbonate D) aluminum sulfate E) none of the above

D) aluminum sulfate

22) Which of the following compounds is INSOLUBLE? A) potassium acetate B) lithium carbonate C) magnesium bromide D) aluminum sulfide E) none of the above

D) aluminum sulfide

33) A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of: A) iron(III) chloride. B) potassium chloride. C) magnesium chloride. D) barium chloride. E) none of the above

D) barium chloride.

53) What is the gas produced when hydrochloric acid is reacted with ammonium carbonate? A) ammonia B) chlorine C) hydrogen D) carbon dioxide E) none of the above

D) carbon dioxide

65) What type of reaction is the generic equation AB + CD > AD + CB? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

D) double-displacement

54) What type of a reaction occurs when a hydrochloric acid solution is mixed with a sodium bicarbonate solution? A) precipitation B) acid-base neutralization C) oxidation-reduction D) gas evolution E) no reaction

D) gas evolution

1) A reaction which forms a gaseous product is an example of a(n)________. A) oxidation-reduction reaction B) combustion reaction C) precipitation reaction D) gas evolution reaction E) none of the above

D) gas evolution reaction

21) An aqueous solution is: A) any liquid with another compound dissolved in it. B) an ionic compound with water dissolved in it. C) water with a molecular compound dissolved in it. D) water with another compound dissolved in it. E) none of the above

D) water with another compound dissolved in it.

4) Which of the following is NOT evidence that a chemical reaction has occurred? A) color change when chemicals are contacted with each other B) solid formation when chemicals are contacted with each other C) gas formation when chemicals are contacted with each other D) emission of light when chemicals are contact with each other E) All of the above are evidence of a chemical reaction.

E) All of the above are evidence of a chemical reaction.

41) Which of the following statements about writing molecular, complete and net ionic equations is FALSE? A) A molecular equation is a chemical equation showing the complete, neutral formulas for every compound in a reaction. B) A complete ionic equation is a chemical equation showing all of the species as they are actually present in solution. C) A net ionic equation is an equation showing only the species that actually participate in the reaction. D) A spectator ion remains unchanged in the reaction and appears on both sides of the equation. E) All of the statements are true.

E) All of the statements are true.

36) Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion would NOT be present in the complete ionic equation? A) Pb2+ B) K+ C) NO3- D) I- E) All the above ions are in the complete ionic equation.

E) All the above ions are in the complete ionic equation.

26) All of the following compounds are soluble in water EXCEPT: A) NaCl. B) CaCl2. C) FeCl3. D) NH4Cl. E) PbCl2.

E) PbCl2.

67) What must be supplied for a decomposition reaction to happen? A) energy B) heat C) electrical current D) light E) any of the above

E) any of the above

32) What type of a reaction occurs when a potassium nitrate solution is mixed with a barium acetate solution? A) precipitation B) acid-base neutralization C) oxidation-reduction D) gas evolution E) no reaction

E) no reaction

45) Which of the following is NOT an acid? A) HClO4 B) HNO3 C) HC2H3O2 D) H2SO4 E) none of the above

E) none of the above