Deck 8: Chemical Reactions

Question 1

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

Answer 1

NaOH + HCl → NaCl + H₂O

Question 2

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

Answer 2

KClO₃ → KCl + O₂

Question 3

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

Answer 3

either A or B

Question 4

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

Question 5

Which process releases energy?

A) bond formation
B) bond breaking
C) both A and B
D) none of the above

Question 6

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

Question 7

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

Question 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

Question 9

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.

Question 10

The following equation is an example of a ________ reaction. NaClO₃ → NaCl + O₂

A) combination
B) combustion
C) decomposition
D) double replacement

Question 11

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

Question 12

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

Question 13

Which process absorbs energy?

A) bond formation
B) bond breaking
C) both A and B
D) none of the above

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

What is the coefficient for iron after the following reaction is balanced? Fe + O₂ → Fe2O₃

A) 1
B) 3
C) 4
D) 6

Question 19

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

Question 20

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

Question 21

Which hydroxide is soluble in water?

A) lead (II) hydroxide
B) magnesium hydroxide
C) calcium hydroxide
D) strontium hydroxide

Question 22

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

Question 23

The following equation is an example of a ________ reaction. C₈H₁₈ + O₂ → CO₂ + H₂O

A) synthesis
B) decomposition
C) double displacement
D) combustion

Question 24

Which hydroxide is insoluble in water?

A) sodium hydroxide
B) barium hydroxide
C) aluminum hydroxide
D) calcium hydroxide

Question 25

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

Question 26

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-

Question 27

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-

Question 28

The following equation is an example of a ________ reaction. Zn + CuCL₂ → Cu + ZnCL₂

A) combination
B) single replacement
C) double replacement
D) decomposition

Question 29

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

Question 30

The following equation is an example of a ________ reaction. Pb(NO₃ )2+ 2KI → PbI₂ + 2KNO₃

A) synthesis
B) precipitation
C) single replacement
D) decomposition

Question 31

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

Question 32

Which of the following is the least soluble in water?

A) sodium sulfate
B) lead (II) nitrate
C) potassium chloride
D) calcium sulfate

Question 33

Which of the following salts is soluble in water?

A) AgCl
B) BaCO₃
C) Ca(SO₄)
D) NaNO₃

Question 34

Which sulfate is insoluble in water?

A) ammonium sulfate
B) strontium sulfate
C) sodium sulfate
D) potassium sulfate

Question 35

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

Question 36

Which sulfate is soluble in water?

A) calcium sulfate
B) barium sulfate
C) lithium sulfate
D) lead (II) sulfate

Question 37

Which chloride is soluble in water?

A) lead (II) chloride
B) calcium chloride
C) mercury (I) chloride
D) silver chloride

Question 38

Which of the following salts is insoluble in water?

A) K₂SO₄
B) AgNO₃
C) CaCO₃
D) Na3PO₄

Question 39

The following equation is an example of a ________ reaction. K₂SO₄ + BaCL₂ → BaSO₄ + KCl

A) combination
B) single replacement
C) double replacement
D) decomposition

Question 40

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-

Question 41

The precipitate formed when sodium chloride and lead (II) nitrate are placed in a test tube is ________.

A) lead (II) chloride
B) sodium nitrate
C) lead (II) hydroxide
D) No precipitate will be formed.

Question 42

If the following ions Ca₂+, Cl-, Na+ and CO₃2- are placed in a test tube, the precipitate formed is ________.

A) CaCO₃
B) NaCl
C) CaCL₂
D) No precipitate will be formed.

Question 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

Question 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

Question 45

The following equation is an example of a ________ reaction. AgNO₃ + NaCl → AgCl + NaNO₃

A) combination
B) precipitation
C) single replacement
D) decomposition

Question 46

If the following ions Ba2+, Cl-, K+ and SO₄2- are placed in a test tube, the precipitate formed is ________.

A) BaSO₄
B) KCl
C) BaCL₂
D) K₂SO₄

Question 47

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

Question 48

Which sulfide is insoluble in water?

A) lead (II) sulfide
B) potassium sulfide
C) ammonium sulfide
D) sodium sulfide

Question 49

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)

Question 50

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-

Question 51

Which phosphate is soluble in water?

A) ammonium phosphate
B) cobalt (II) phosphate
C) aluminum phosphate
D) barium phosphate

Question 52

The net ionic equation for the following reaction is ________. H₂SO₄ + KOH → K₂SO₄ + H₂O

A) K+ (aq) + SO₄2- (aq) → K₂SO₄
B) H+ (aq) + OH- (aq) → H₂O
C) K+ (aq) + OH-(aq) → KOH
D) H+ (aq) + SO₄2- (aq) → H₂SO₄

Question 53

It takes ________ mole(s)of calcium hydroxide to neutralize ________ moles of sulfuric acid.

A) 1; 1
B) 1; 2
C) 2; 1
D) 1; 3

Question 54

The precipitate formed when hydrochloric acid and sodium hydroxide are placed in a test tube is ________.

A) sodium hydroxide
B) sodium chloride
C) hydrochloric acid
D) No precipitate will be formed.

Question 55

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

Question 56

The precipitate formed when barium nitrate and potassium chromate are placed in a test tube is ________.

A) barium nitrate
B) barium chromate
C) potassium nitrate
D) potassium chromate

Question 57

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

Question 58

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

Question 59

It takes ________ mole(s) of sulfuric acid to neutralize ________ moles of aluminum hydroxide.

A) 2; 3
B) 3; 2
C) 1; 2
D) 1; 1

Question 60

It takes ________ mole(s) of potassium hydroxide to neutralize ________ moles of sulfuric acid.

A) 1; 1
B) 1; 2
C) 2; 1
D) 3; 1

Question 61

The number of moles of sodium hydroxide needed to neutralize one mole of nitric acid is ________.

A) 1
B) 2
C) 3
D) 0.5

Question 62

In a precipitation reaction, all ions and compounds are soluble in water.

Question 63

The coefficients in the balanced equation are 1: 19: 8: 3.
C₈H₆ + O₂ → CO₂ + H₂O

Question 64

In a combustion reaction, oxygen is typically one of the reactants.

Question 65

Bond breaking releases energy.

Question 66

Another term for the combination reaction is a synthesis reaction.

Question 67

It takes two moles of sulfuric acid to neutralize one mole of sodium hydroxide.

Question 68

Ammonium phosphate is soluble in water, but ammonium carbonate is insoluble in water.

Question 69

All nitrates are soluble in water.

Question 70

In a combination reaction two or more compounds yield two or more compounds.

Question 71

In a decomposition reaction, one compound breaks down into two or more simpler compounds or elements.

Question 72

Bond formation releases energy.

Question 73

Silver (I) chloride is insoluble in water, while silver (I) acetate is soluble in water.

Question 74

All hydroxides are insoluble in water.

Question 75

Only the halides of lead (II) and silver (I) are insoluble in water.

Question 76

One needs to balance a chemical reaction before identifying the type of reaction.

Question 77

The coefficients in the balanced equation are 1: 6: 2: 3.
Au₂S₃ + H₂ → Au + H₂S

Question 78

When the following ions barium, chloride, sodium and sulfate are placed together in a test tube, barium sulfate precipitates out.

Question 79

A combustion reaction always involves carbon dioxide formation.

Question 80

The coefficients in the balanced equation are 2: 2: 3.
KClO₃ → KCl + O₂