Question 1

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.F) A) and E)
G) B) and D)

Question 2

What would be the formula of the precipitate that forms when Pb(NO3) 2 (aq) and K2SO4 (aq) are mixed?

Accepted Answer

A)  K(NO3) 2
B)  PbSO4
C)  PbK2
D)  H2O
E)  none of the aboveF) B) and E)
G) B) and D)

Question 3

A reaction which forms a solid product is an example of a(n) :

Accepted Answer

A)  oxidation-reduction reaction.
B)  combustion reaction.
C)  precipitation reaction.
D)  gas evolution reaction.
E)  none of the aboveF) B) and D)
G) None of the above

Question 4

If you had an aqueous mixture that contained Ag+,K+,and Pb2+ cations,how many different solids could precipitate if a chloride solution was added?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  no solids will precipitateF) A) and C)
G) None of the above

Question 5

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.F) B) and C)
G) All of the above

Question 6

In writing the chemical equation for a precipitation reaction,what abbreviation of the physical state must appear with one of the products?

Accepted Answer

A)  (s) 
B)  (g) 
C)  (l) 
D)  (w) 
E)  none of the aboveF) All of the above
G) None of the above

Question 7

Before a chemical equation can be written,one must know:

Accepted Answer

A)  the atomic mass of all the elements involved.
B)  the molar mass of all the compounds.
C)  the symbols and formulas of all reactants and products.
D)  the number of moles of all reactants and products.
E)  none of the above.F) A) and B)
G) All of the above

Question 8

All of the following compounds are soluble in water EXCEPT:

Accepted Answer

A)  NaCl.
B)  CaCl2.
C)  FeCl3.
D)  NH4Cl.
E)  PbCl2.F) B) and D)
G) A) and B)

Question 9

The net ionic equation for the reaction of sodium hydroxide plus hydrochloric acid is  .

Accepted Answer

A) True 
 B)False

Question 10

An aqueous solution is:

Accepted Answer

A)  any liquid with another compound dissolved in it.
B)  an ionic compound with water dissolved in it.
C)  water with a molecular compound dissolved in it.
D)  water with another compound dissolved in it.
E)  none of the aboveF) A) and D)
G) B) and D)

Question 11

The following equation IS balanced: 2 C4H10O + 13 O2 → 8 CO2 + 10 H2O

Accepted Answer

A) True 
 B)False

Question 12

What type of a reaction occurs when a sodium hydroxide solution is mixed with an acetic acid solution?

Accepted Answer

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

Question 13

One of the characteristics of an acid-base reaction is that this type of reaction forms water.

Accepted Answer

A) True 
 B)False

Question 14

What are the coefficients for the following reaction when it is properly balanced? ___potassium iodide + ___lead (II) acetate → ___lead (II) iodide +___potassium acetate

Accepted Answer

A)  2,1,1,1
B)  2,1,1,2
C)  3,2,2,1
D)  1,1,2,2
E)  none of the aboveF) C) and D)
G) A) and B)

Question 15

The following reaction IS balanced: AgNO3 + 2NH4Cl → AgCl + (NH4)2NO3

Accepted Answer

A) True 
 B)False

Question 16

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 aboveF) B) and E)
G) All of the above

Question 17

Which of the following equations is NOT balanced properly?

Accepted Answer

A)  2Cr + 6HCl → 2CrCl3 + 3H2
B)  2NaHCO3 → Na2CO3 + CO2 + H2O
C)  Cr2(SO4) 3 + 6KOH → 2Cr(OH) 3 + 3 K2SO4
D)  4NH3 + 14O2 → 4NO2 + 6H2O
E)  none of the aboveF) A) and C)
G) None of the above

Question 18

When a solution of MgCl2 and one of AgNO3 are mixed,the net ionic equation is:

Accepted Answer

A)  Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) + 2NO3- (aq) → Mg2+(aq) + 2NO3-aq) + 2AgCl(s) 
B)  Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) + 2NO3- (aq) → Mg(NO3) 2 (aq) + 2 AgCl(s) 
C)  Mg2+(aq) + 2NO3-(aq) → Mg(NO3) 2(aq) 
D)  Cl-(aq) + Ag+(aq) → AgCl(s) 
E)  none of the aboveF) A) and B)
G) A) and D)

Question 19

What type of a reaction occurs when a hydrochloric acid solution is mixed with a sodium bicarbonate solution?

Accepted Answer

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

Question 20

Methane gas (CH4) ,on complete combustion in air,produces: 
1.CO2
2.H2
3.H2O

Accepted Answer

A)  1 and 2 only
B)  1 and 3 only
C)  2 and 3 only
D)  All of 1 and 2 only
E)  None ofF) B) and D)
G) A) and D)

Exam 7: Chemical Reactions

In writing the chemical equation for a precipitation reaction,what abbreviation of the physical state must appear with one of the products?

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Before a chemical equation can be written,one must know:

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The following equation IS balanced: 2 C4H10O + 13 O2 → 8 CO2 + 10 H2O

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Methane gas (CH4) ,on complete combustion in air,produces: 1.CO2 2.H2 3.H2O

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What would be the formula of the precipitate that forms when Pb(NO3) 2 (aq) and K2SO4 (aq) are mixed?

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If you had an aqueous mixture that contained Ag+,K+,and Pb2+ cations,how many different solids could precipitate if a chloride solution was added?

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Which of the following statements about balancing reactions is FALSE?

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

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The following reaction IS balanced: AgNO3 + 2NH4Cl → AgCl + (NH4)2NO3

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What type of a reaction occurs when a hydrochloric acid solution is mixed with a sodium bicarbonate solution?

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The net ionic equation for the reaction of sodium hydroxide plus hydrochloric acid is .

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An aqueous solution is:

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One of the characteristics of an acid-base reaction is that this type of reaction forms water.

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Which of the following equations is NOT balanced properly?

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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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All of the following compounds are soluble in water EXCEPT:

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When a solution of MgCl2 and one of AgNO3 are mixed,the net ionic equation is:

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What type of a reaction occurs when a sodium hydroxide solution is mixed with an acetic acid solution?

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What are the coefficients for the following reaction when it is properly balanced? ___potassium iodide + ___lead (II) acetate → ___lead (II) iodide +___potassium acetate

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A reaction which forms a solid product is an example of a(n) :

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The following equation IS balanced: 2 C₄H₁₀O + 13 O₂ → 8 CO2 + 10 H₂O

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Methane gas (CH₄) ,on complete combustion in air,produces: 1.CO₂ 2.H₂ 3.H₂O

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What would be the formula of the precipitate that forms when Pb(NO₃) ₂ (aq) and K₂SO₄ (aq) are mixed?

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If you had an aqueous mixture that contained Ag⁺,K⁺,and Pb²⁺ cations,how many different solids could precipitate if a chloride solution was added?

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The following reaction IS balanced: AgNO₃ + 2NH₄Cl → AgCl + (NH₄)₂NO₃

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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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When a solution of MgCl₂ and one of AgNO₃ are mixed,the net ionic equation is:

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What are the coefficients for the following reaction when it is properly balanced? _potassium iodide + _lead (II) acetate → _lead (II) iodide +_potassium acetate

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