Question 1

Considering the following precipitation reaction: 
Pb(NO3)2(aq)+ 2KI(aq)→ PbI2(s)+ 2KNO3(aq)
Which ion(s)would NOT be spectator ions?

Accepted Answer

A) Pb2+,NO3- 
B) K+,I- 
C) NO3-,Pb2+ 
D) Pb2+,I - 
E) All the above ions are in the net ionic equation.

Question 2

When solid NaCl is stirred into water,which of the following is NOT true?

Accepted Answer

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

Question 3

The compound sodium sulfate is soluble in water.When this compound dissolves in water,which ion listed below would be present in solution?

Accepted Answer

A) SO42- 
B) S2- 
C) O2- 
D) Na22+ 
E) none of the above

Question 4

What type of reaction is the generic equation A + BC → AC + B?

Accepted Answer

A) synthesis/combination 
B) decomposition 
C) single displacement 
D) double-displacement 
E) none of the above

Question 5

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)

Accepted Answer

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

Question 6

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)

Accepted Answer

A) K+ 
B) H+ 
C) OH- 
D) H2O 
E) none of the above

Question 7

When water is heated,bubbles form in the water.Is this evidence of a chemical reaction? Why?

Accepted Answer

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

Question 8

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?

Accepted Answer

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.

Question 9

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)

Accepted Answer

A) Ag+ 
B) Br- 
C) K+ 
D) AgBr 
E) none of the above

Question 10

What type of a reaction occurs when a potassium nitrate solution is mixed with a barium acetate solution?

Accepted Answer

A) precipitation 
B) acid-base neutralization 
C) oxidation-reduction 
D) gas evolution 
E) no reaction

Question 11

When the equation __Ca3N2 + __H2O → __Ca(OH)2 + __NH3 is balanced,the coefficient of H2O is:

Accepted Answer

A) 2 
B) 3 
C) 6 
D) 12 
E) none of the above

Question 12

A net ionic equation shows all ionic species that are present in solution.

Accepted Answer

A) True 
 B)False

Question 13

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?

Accepted Answer

A) PbI2 
B) KNO3 
C) Pb(NO3)2 
D) KI 
E) All compounds form ions in the complete ionic equation.

Exam 7: Chemical Reactions

Considering the following precipitation reaction: Pb(NO₃) ₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq) Which ion(s) would NOT be spectator ions?

When solid NaCl is stirred into water,which of the following is NOT true?

The compound sodium sulfate is soluble in water.When this compound dissolves in water,which ion listed below would be present in solution?

What type of reaction is the generic equation A + BC → AC + B?

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)

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)

When water is heated,bubbles form in the water.Is this evidence of a chemical reaction? Why?

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?

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)

What type of a reaction occurs when a potassium nitrate solution is mixed with a barium acetate solution?

When the equation Ca₃N₂ + H₂O → Ca(OH) ₂ + NH₃ is balanced,the coefficient of H₂O is:

A net ionic equation shows all ionic species that are present in solution.

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?

Exam 7: Chemical Reactions

Considering the following precipitation reaction: Pb(NO3) 2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) would NOT be spectator ions?

When solid NaCl is stirred into water,which of the following is NOT true?

The compound sodium sulfate is soluble in water.When this compound dissolves in water,which ion listed below would be present in solution?

What type of reaction is the generic equation A + BC → AC + B?

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)

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)

When water is heated,bubbles form in the water.Is this evidence of a chemical reaction? Why?

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?

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)

What type of a reaction occurs when a potassium nitrate solution is mixed with a barium acetate solution?

When the equation __Ca3N2 + __H2O → __Ca(OH) 2 + __NH3 is balanced,the coefficient of H2O is:

A net ionic equation shows all ionic species that are present in solution.

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?

Considering the following precipitation reaction: Pb(NO₃) ₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq) Which ion(s) would NOT be spectator ions?

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)

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)

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)

When the equation Ca₃N₂ + H₂O → Ca(OH) ₂ + NH₃ is balanced,the coefficient of H₂O is:

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?