Chemistry Chapter 8 What is the coefficient for iron after the following

Introductory Chemistry: Atoms First, 5e (Russo/Silver)

Chapter 8 Chemical Reactions

8.1 Multiple-Choice Questions

1) Which of the following statements is correct about a superconductor?

A) It possesses the extraordinary property, when cooled, to have a magnet float as if defying

gravity.

B) It conducts electricity with zero resistance.

C) It prevents magnetic field lines from penetrating it.

D) All of the above statements are correct about a superconductor.

2) In a gas-phase reaction ________.

A) only the products are gases

B) only the reactants are gases

C) both the reactants and the products are gases

D) solids and liquids may be present, but at least one reagent must be a gas

3) Which process releases energy?

A) bond formation

B) bond breaking

C) both A and B

D) none of the above

4) Which process absorbs energy?

A) bond formation

B) bond breaking

C) both A and B

D) none of the above

5) Which of the following equations has 1:1:1:1 as the coefficient ratio when balanced?

A) H2SO4 + KOH → K2SO4 + H2O

B) Zn + HCl → H2 + ZnCl2

C) CH4 + O2 → CO2 + H2O

D) NaOH + HCl → NaCl + H2O

6) Which of the following equations has 1:2:1:1 as the coefficient ratio when balanced?

A) H2SO4 + KOH → K2SO4 + H2O

B) Zn + HCl → H2 + ZnCl2

C) CH4 + O2 → CO2 + H2O

D) NaOH + HCl → NaCl + H2O

7) Which of the following balanced reactions does not have at least one 6 as a coefficient?

A) H2SO4 + Al(OH)3 → Al2(SO4)3 + H2O

B) H3PO4 + Ba(OH)2 → Ba3(PO4)2 + H2O

C) C6H12O6 + O2 → CO2 + H2O

D) C2H2 + O2 → CO2 + H2O

8) The coefficients are respectively ________ for the following equation.

Fe2O3 + Al → Al2O3 + Fe

A) 1: 2: 1: 2

B) 2: 3: 2: 3

C) 1: 2: 2: 1

D) 2: 3: 3: 4

9) The coefficients are respectively ________ for the following equation.

C4H10 + O2 → CO2 + H2O

A) 1: (13/2): 4: 5

B) 2: 13: 8: 10

C) 1: 13: 4: 5

D) either A or B

10) Which of the following equations does not have 1:2:1:2 as the coefficient ratio when

balanced?

A) H2SO4 + KOH → K2SO4 + H2O

B) Ca(OH)2 + HCl → CaCl2 + H2O

C) CH4 + O2 → CO2 + H2O

D) K + H2O → H2 + KOH

11) Which of the following has 6 as one of the coefficients when the equation is balanced?

A) H2SO4 + Al(OH)3 → Al2(SO4)3 + H2O

B) C2H6O +O2 → CO2 + H2O

C) Mg + HCl → H2 + MgCl2

D) Al(OH)3 + HCl → AlCl3 + H2O

12) What is the coefficient for iron after the following reaction is balanced?

Fe + O2 → Fe2O3

A) 1

B) 3

C) 4

D) 6

13) What is the sum of all coefficients after the following equation is balanced?

C8H18 + O2 → CO2 + H2O

A) 4

B) 18

C) 32

D) 61

14) What is the sum of all coefficients after the following equation is balanced?

K2CrO4 + Al(NO3)3 → Al2(Cr O4)3 + KNO3

A) 4

B) 8

C) 12

D) 15

15) Which of the following reactions is a single replacement reaction?

A) HCl + NaOH → NaCl + H2O

B) Mg + HCl → H2 + MgCl2

C) CaCl2 + H2O → CaCl2 ∙ 2H2O

D) KClO3 → KCl + O2

16) Which of the following reactions is a double replacement reaction?

A) HCl + NaOH → NaCl + H2O

B) Mg + HCl → H2 + MgCl2

C) CaC12 + H2O → CaCl2 ∙ 2H2O

D) KClO3 → KCl + O2

17) Which of the following reactions is a decomposition reaction?

A) HCl + NaOH → NaCl + H2O

B) Mg + HCl → H2 + MgCl2

C) CaCl2 + H2O → CaCl2 ∙ 2H2O

D) KClO3 → KCl + O2

18) Which of the following is an example of a combination reaction?

A) HCl + NaOH → NaCl + H2O

B) Mg + HCl → H2 + MgCl2

C) 2 Na + Cl2 → 2NaCl

D) KClO3 → KCl + O2

19) Which of the following equations is not a combustion reaction?

A) C2H6O + O2 → H2O + CO2

B) CH4 + O2 → CO + H2O

C) KClO3 → KCl +O2

D) Fe + O2 → FeO

20) The following equation is an example of a ________ reaction.

NaClO3 → NaCl + O2

A) combination

B) combustion

C) decomposition

D) double replacement

21) The following equation is an example of a ________ reaction.

Zn + CuCl2 → Cu + ZnCl2

A) combination

B) single replacement

C) double replacement

D) decomposition

22) The following equation is an example of a ________ reaction.

K2SO4 + BaCl2 → BaSO4 + KCl

A) combination

B) single replacement

C) double replacement

D) decomposition

23) Which of the following equations is not a single replacement reaction?

A) H2SO4 + Mg(OH)2 → H2O + MgSO4

B) Zn + HCl → H2 + ZnCl2

C) Al + Fe2O3 → Al2O3 + Fe

D) Na + H2O → NaOH + H2

24) Which of the following equations is not a double replacement reaction?

A) H2SO4 + Mg(OH)2 → H2O + MgSO4

B) Mg + HCl → H2 + MgCl2

C) AlCl3 + H2O → Al(OH)3 + HCl

D) AgNO3 + NaCl → AgCl + NaNO3

25) Which of the following equations is not a decomposition reaction?

A) CaSO4 ∙ 2H2O → CaSO4 + 2 H2O

B) NaClO3 → NaCl + O2

C) H2O2 → H2O + O2

D) K + H2O → KOH + H2

26) Which of the following equations is not a combination reaction?

A) H2 + O2 → H2O

B) C2H4 + Br2 → C2H4Br2

C) CH4 + O2 → CO2 + H2O

D) Fe + O2 → Fe3O4

27) Which of the following equations is a combustion reaction?

A) MgO + HCl → MgCl2 + H2O

B) Al + Fe2O3 → Al2O3 + Fe

C) KClO3 → KCl + O2

D) CH4 + O2 → CO2 + H2O

28) The following equation is an example of a ________ reaction.

C8H18 + O2 → CO2 + H2O

A) synthesis

B) decomposition

C) double displacement

D) combustion

29) The spectator ions in the following precipitation equation are ________.

AgNO3 + NaCl → AgCl + NaNO3

A) Ag+ and NO3–

B) Na+ and NO3–

C) Ag+ and Cl–

D) Na+ and Cl–

30) Which ions are not spectator ions in the following precipitation equation?

AgNO3 + NaCl → AgCl + NaNO3

A) Ag+ and NO3–

B) Na+ and NO3–

C) Ag+ and Cl–

D) Na+ and Cl–

31) The following equation is an example of a ________ reaction.

Pb(NO3 )2+ 2KI → PbI2 + 2KNO3

A) synthesis

B) precipitation

C) single replacement

D) decomposition

32) The spectator ions in the following precipitation equation are ________.

Pb(NO3)2+ 2KI → PbI2 + 2KNO3

A) Pb2+ and I–

B) K+ and NO3–

C) K+ and I–

D) Pb2+ and NO3–

33) Which of the following is the least soluble in water?

A) sodium sulfate

B) lead (II) nitrate

C) potassium chloride

D) calcium sulfate

34) Which of the following salts is insoluble in water?

A) K2SO4

B) AgNO3

C) CaCO3

D) Na3PO4

35) Which of the following salts is soluble in water?

A) AgCl

B) BaCO3

C) Ca(SO4)

D) NaNO3

36) Which hydroxide is insoluble in water?

A) sodium hydroxide

B) barium hydroxide

C) aluminum hydroxide

D) calcium hydroxide

37) Which hydroxide is soluble in water?

A) lead (II) hydroxide

B) magnesium hydroxide

C) calcium hydroxide

D) strontium hydroxide

38) Which chloride is soluble in water?

A) lead (II) chloride

B) calcium chloride

C) mercury (I) chloride

D) silver chloride

39) Which sulfate is insoluble in water?

A) ammonium sulfate

B) strontium sulfate

C) sodium sulfate

D) potassium sulfate

40) Which sulfate is soluble in water?

A) calcium sulfate

B) barium sulfate

C) lithium sulfate

D) lead (II) sulfate

41) Which sulfide is insoluble in water?

A) lead (II) sulfide

B) potassium sulfide

C) ammonium sulfide

D) sodium sulfide

42) Which phosphate is soluble in water?

A) ammonium phosphate

B) cobalt (II) phosphate

C) aluminum phosphate

D) barium phosphate

43) Which lead (II) compound is soluble in water?

A) lead (II) sulfate

B) lead (II) carbonate

C) lead (II) chloride

D) lead (II) nitrate

44) Which of the following equations is not a precipitation reaction?

A) Na2SO4 + CaCl2 → CaSO4 + NaCl

B) MgCl2 + AgNO3 → Mg(NO3)2 + AgCl

C) NaOH + HCl → NaCl + H2O

D) NaCl+ AgC2H3O2 → AgCl + NaC2H3O2

45) The following equation is an example of a ________ reaction.

AgNO3 + NaCl → AgCl + NaNO3

A) combination

B) precipitation

C) single replacement

D) decomposition

46) Which ions are not spectator ions in the following precipitation equation?

Pb(NO3)2+ 2KI → PbI2 + 2KNO3

A) Pb2+ and I–

B) K+ and NO3–

C) K+ and I–

D) Pb2+ and NO3–

47) When aqueous solutions of sodium phosphate and calcium nitrite are mixed, the spectator

ions are ________.

A) calcium and nitrite

B) sodium and phosphate

C) calcium and phosphate

D) sodium and nitrite

48) When aqueous solutions of calcium hydroxide and hydrobromic acid are mixed, the spectator

ions are ________.

A) calcium and bromide

B) hydrogen and hydroxide

C) calcium and hydroxide

D) hydrogen and bromide

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49) When aqueous solutions of sodium nitrate and potassium chloride are mixed, the spectator

ions are ________.

A) potassium and nitrate

B) sodium and chloride

C) both A and B

D) no spectator ions are present

50) The net ionic equation for the following reaction is ________.

AgNO3 + NaCl → AgCl + NaNO3

A) Ag+ (aq) + NO3– (aq) → AgNO3

B) Ag+ (aq) + Cl– (aq) → AgCl (s)

C) Na+ (aq) + NO3– (aq) → NaNO3

D) NaCl + AgNO3 → AgCl (s)

51) If the following ions Ca2+, NO3–, Na+ and SO42- are placed in a test tube, the precipitate

formed is ________.

A) NaNO3

B) CaSO4

C) Ca(NO3)2

D) Na2SO4