Deck 8: Chemical Reactions

Question 1

Which process absorbs energy?

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

Answer 1

bond breaking

Question 2

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

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

Answer 2

precipitation

Question 3

In a gas-phase reaction ________.

A)only products are gases
B)only reactants are gases
C)both reactants and products are gases
D)solids and liquids may be present, but at least one reagent must be a gas

Answer 3

only reactants are gases

Question 4

The spectator ions in the precipitation equation Pb(NO₃)₂+ 2KI → PbI₂ + 2KNO₃ are ________.

A)Pb²⁺ and I^-
B)K⁺ and NO₃^-
C)K⁺ and I^-
D)Pb²⁺ and NO₃^-

Question 5

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 6

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 7

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

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

Question 8

The equation Zn + CuCl₂ → Cu + ZnCl₂ is an example of a ________ reaction.

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

Question 9

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

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

Question 10

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

Question 11

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 12

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 13

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 14

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 15

Which process releases energy?

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

Question 16

The spectator ions in the precipitation equation AgNO₃ + NaCl → AgCl + NaNO₃ are ________.

A)Ag⁺ and NO₃^-
B)Na⁺ and NO₃^-
C)Ag⁺ and Cl^-
D)Na⁺ and Cl^-

Question 17

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 18

Which of the following is an example of a synthesis reaction?

A)HCl + NaOH → NaCl + H₂O
B)Mg + HCl → H₂ + MgCl₂
C)2 Na + Cl₂ → 2NaCl
D)KClO₃ → KCl + O₂

Question 19

Which ions are not spectator ions in the precipitation equation AgNO₃ + NaCl → AgCl + NaNO₃?

A)Ag⁺ and NO₃^-
B)Na⁺ and NO₃^-
C)Ag⁺ and Cl^-
D)Na⁺ and Cl^-

Question 20

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 21

Which of the following equations does not have 1:2:1:2 as the relative ratio of coefficients 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 22

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 23

After balancing the equation Fe₂O₃ + Al → Al₂O₃ + Fe the correct coefficients are respectively ________.

A)1: 2: 1: 2
B)2: 3: 2: 3
C)1: 2: 2: 1
D)2: 3: 3: 4

Question 24

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

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

Question 25

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 26

If the following ions Ca²⁺, Cl^-, Na⁺ and CO₃^2- are placed in a test tube, the precipitate formed is ________.

A)CaCO₃
B)NaCl
C)CaCl₂
D)no precipitate will be formed

Question 27

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 28

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 29

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

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

Question 30

Which of the following equations has 1:1:1:1 as the relative ratio of coefficients when balanced?

A)H₂SO₄ + KOH → K₂SO₄ + H₂O
B)Zn + HCl → H₂ + ZnCl₂
C)CH₄ + O₂ → CO₂ + H₂O
D)NaOH + HCl → NaCl + H₂O

Question 31

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 32

Which of the following salts is water insoluble?

A)K₂SO₄
B)AgNO₃
C)CaCO₃
D)Na₃PO₄

Question 33

The net ionic equation for the reaction AgNO₃ + NaCl → AgCl + NaNO₃ is ________.

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 34

Which of the following equations has 1:2:1:1 as the relative ratio of coefficients when balanced?

A)H₂SO₄ + KOH → K₂SO₄ + H₂O
B)Zn + HCl → H₂ + ZnCl₂
C)CH₄ + O₂ → CO₂ + H₂O
D)NaOH + HCl → NaCl + H₂O

Question 35

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 36

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

A)K⁺ (aq)+ SO₄^2- (aq)→ K₂SO₄
B)H⁺ (aq)+ OH^- (aq)→ H₂O
C)K⁺ (aq)+ OH^-(aq)→ KOH
D)H⁺ (aq)+ SO₄^2- (aq)→ H₂SO₄

Question 37

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 38

Which of the following is the least soluble in water?

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

Question 39

If the following ions Ba²⁺, Cl^-, K⁺ and SO₄^2- are placed in a test tube, the precipitate formed is ________.

A)BaSO₄
B)KCl
C)BaCl₂
D)K₂SO₄

Question 40

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 41

Which sulfate is water soluble?

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

Question 42

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 43

Which sulfide is water insoluble?

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

Question 44

Which sulfate is water insoluble?

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

Question 45

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

Question 46

Which of the following salts is water soluble?

A)AgCl
B)BaCO₃
C)Al₂(SO₄)₃
D)NaNO₃

Question 47

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

Question 48

Which hydroxide is water insoluble?

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

Question 49

A combustion reaction always involves carbon dioxide formation.

Question 50

Bond formation releases energy.

Question 51

It takes ________ moles of calcium hydroxide to neutralize ________ moles of sulfuric acid.

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

Question 52

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

Question 53

Bond breaking releases energy.

Question 54

All nitrates are water soluble

Question 55

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

Question 56

Which phosphate is water soluble?

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

Question 57

Which chloride is water soluble?

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

Question 58

It takes ________ moles of potassium hydroxide to neutralize ________ moles of sulfuric acid.

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

Question 59

It takes ________ moles of sulfuric acid to neutralize ________ moles of aluminum hydroxide.

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

Question 60

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

Question 62

An alternative name for lye is potassium hydroxide.

Question 64

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

Question 68

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

Question 69

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

Question 70

An alternative name for hydrochloric acid is muriatic acid.

Question 71

All hydroxides are water insoluble

Question 72

Match every equation in the questions with its type that appears in the list below.

Question 73

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

Question 74

Predict whether each of the compounds listed in the questions is water soluble or insoluble.

Question 75

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

Question 76

Match each of the acid-base pairs in the questions with the relative neutralization ratio that appears in the list below.

Question 77

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

Question 78

Match each of the acids that appears in the questions with a use or alternative name that appears in the list below.

Question 79

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