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

What is the gas produced when hydrochloric acid is reacted with ammonium carbonate?

Accepted Answer

A)  ammonia
B)  chlorine
C)  hydrogen
D)  carbon dioxide
E)  none of the above

Question 3

Combustion reactions emit heat and so can be classified as endothermic.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following compounds is SOLUBLE?

Accepted Answer

A)  aluminum hydroxide
B)  aluminum sulfide
C)  aluminum carbonate
D)  aluminum sulfate
E)  none of the above

Question 5

Considering the following precipitation reaction:
Pb(NO3) 2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) 
What is the correct net ionic equation?

Accepted Answer

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

Question 6

Which of the following everyday substances does NOT typically contain an acid?

Accepted Answer

A)  lemons
B)  vinegar
C)  soap
D)  limes
E)  all of the above

Question 7

Cl-,Br-,and I- are mostly insoluble.

Accepted Answer

A) True 
 B)False

Question 8

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?

Accepted Answer

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

Question 9

What type of reaction is the generic equation AB  →	o→  A + B?

Accepted Answer

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

Question 10

Which of the following statements about balancing reactions is FALSE?

Accepted Answer

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.

Question 11

A reaction in which a substance reacts with oxygen,emitting heat and forming oxygen-containing compounds is an example of a(n)

Accepted Answer

A)  acid-base reaction.
B)  combustion reaction.
C)  precipitation reaction.
D)  gas evolution reaction.
E)  none of the above

Question 12

What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide?

Accepted Answer

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

Question 13

What must be supplied for most decomposition reactions to happen?

Accepted Answer

A)  energy
B)  heat
C)  electrical current
D)  light
E)  any of the above

Question 14

What are the coefficients for the following reaction when it is properly balanced?
___Na3PO4 + ___Ba(NO3) 2 → ___NaNO3 + ___Ba3(PO4) 2

Accepted Answer

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

Question 15

Which of the following is NOT evidence that a chemical reaction has occurred?

Accepted Answer

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.

Question 16

A precipitation reaction will occur when sodium chloride is mixed with potassium nitrate.

Accepted Answer

A) True 
 B)False

Question 17

Evidence of a redox reaction is when one substance transfers protons to another substance.

Accepted Answer

A) True 
 B)False

Question 18

The following equation IS balanced: HNO3 + NaHSO3 → NaNO3 + H2O + SO2

Accepted Answer

A) True 
 B)False

Question 19

The reaction of baking soda and vinegar to produce carbon dioxide gas is an example of a precipitation reaction.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following statements about writing molecular,complete and net ionic equations is FALSE?

Accepted Answer

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 change during 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.

Exam 7: Chemical Reactions

What is the gas produced when hydrochloric acid is reacted with ammonium carbonate?

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The following equation IS balanced: HNO3 + NaHSO3 → NaNO3 + H2O + SO2

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Which of the following is NOT evidence that a chemical reaction has occurred?

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A precipitation reaction will occur when sodium chloride is mixed with potassium nitrate.

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Combustion reactions emit heat and so can be classified as endothermic.

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Which of the following compounds is SOLUBLE?

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What are the coefficients for the following reaction when it is properly balanced? ___Na3PO4 + ___Ba(NO3) 2 → ___NaNO3 + ___Ba3(PO4) 2

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Evidence of a redox reaction is when one substance transfers protons to another substance.

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

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Which of the following everyday substances does NOT typically contain an acid?

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Which of the following statements about balancing reactions is FALSE?

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Cl-,Br-,and I- are mostly insoluble.

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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?

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Which of the following statements about writing molecular,complete and net ionic equations is FALSE?

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What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide?

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What must be supplied for most decomposition reactions to happen?

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What type of reaction is the generic equation AB →\to→ A + B?

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The reaction of baking soda and vinegar to produce carbon dioxide gas is an example of a precipitation reaction.

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A reaction in which a substance reacts with oxygen,emitting heat and forming oxygen-containing compounds is an example of a(n)

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Considering the following precipitation reaction: Pb(NO3) 2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct net ionic equation?

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The following equation IS balanced: HNO₃ + NaHSO₃ → NaNO₃+ H₂O+ SO₂

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What are the coefficients for the following reaction when it is properly balanced? _Na₃PO₄ + _Ba(NO₃) ₂→ _NaNO₃ + _Ba₃(PO₄) ₂

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

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Cl^-,Br^-,and I^- are mostly insoluble.

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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?

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What type of reaction is the generic equation AB $\to$ A + B?

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Considering the following precipitation reaction: Pb(NO₃) ₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq) What is the correct net ionic equation?

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