Question 1

Which of the following does not take place in a chemical reaction?

Accepted Answer

A)  New substances are formed. 
B)  Neutrons are released. 
C)  Energy is released or absorbed. 
D)  Reactants disappear. 
A)  New substances are formed. 
B)  Neutrons are released. 
C)  Energy is released or absorbed. 
D)  Reactants disappear.

Question 2

Write the balanced chemical equation for the complete combustion of pentane,C5H12.

Accepted Answer

Question 3

The coefficients needed to balance the reaction Sb2S3 + HCl → SbCl3 + H2S are,respectively,

Accepted Answer

A)  1, 2, 1, and 1. 
B)  2, 1, 3, and 1. 
C)  1, 2, 1, and 3. 
D)  1, 6, 2, and 3. 
E)  1, 1, 1, and 1. 
A)  1, 2, 1, and 1. 
B)  2, 1, 3, and 1. 
C)  1, 2, 1, and 3. 
D)  1, 6, 2, and 3. 
E)  1, 1, 1, and 1.

Question 4

According to the Arrhenius theory,basic properties are caused by ______________ ions.

Accepted Answer

The answer of According to the Arrhenius theory,basic properties are...

Question 5

One product of photosynthesis is

Accepted Answer

A)  hydrogen. 
B)  oxygen. 
C)  carbon dioxide. 
D)  methane. 
A)  hydrogen. 
B)  oxygen. 
C)  carbon dioxide. 
D)  methane.

Question 6

The human body contains thousands of catalysts called ______________.

Accepted Answer

The answer of The human body contains thousands of catalysts...

Question 7

In order,from top to bottom,in the activity series come Li,K,Ba,Na,Al,Zn,Sn,and Pb.Therefore,

Accepted Answer

A)  tin is more active than lead. 
B)  zinc is more active than aluminum. 
C)  potassium is more active than lithium. 
D)  sodium is more active than barium. 
A)  tin is more active than lead. 
B)  zinc is more active than aluminum. 
C)  potassium is more active than lithium. 
D)  sodium is more active than barium.

Question 8

By definition,the removal of oxygen from a compound is called

Accepted Answer

A)  neutralization. 
B)  reduction. 
C)  oxidation. 
D)  displacement. 
A)  neutralization. 
B)  reduction. 
C)  oxidation. 
D)  displacement.

Question 9

How many moles of He would 3.01 × 1023 helium atoms be?

Accepted Answer

A)  2.00 
B)  4.00 
C)  0.50 
D)  1.00 
E)  None of these 
A)  2.00 
B)  4.00 
C)  0.50 
D)  1.00 
E)  None of these

Question 10

A substance that increases the rate of a chemical reaction but is not consumed in the reaction is called

Accepted Answer

A)  an oxidizing agent. 
B)  a catalyst. 
C)  an activation agent. 
D)  a reducing agent. 
A)  an oxidizing agent. 
B)  a catalyst. 
C)  an activation agent. 
D)  a reducing agent.

Question 11

A chemical reaction generally has a great effect on an atom's

Accepted Answer

A)  nuclear structure. 
B)  mass. 
C)  nuclear binding energy. 
D)  electron configuration. 
A)  nuclear structure. 
B)  mass. 
C)  nuclear binding energy. 
D)  electron configuration.

Question 12

A solution with a pH of 14 is

Accepted Answer

A)  strongly acidic. 
B)  weakly basic. 
C)  strongly basic. 
D)  weakly acidic. 
A)  strongly acidic. 
B)  weakly basic. 
C)  strongly basic. 
D)  weakly acidic.

Question 13

When energy is released in a chemical reaction,the reaction is called a(n)______________ reaction.

Accepted Answer

The answer of When energy is released in a chemical...

Question 14

When the equation Sb2S3 + HCl → SbCl3 + H2S is balanced,the coefficient of H2S is

Accepted Answer

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

Question 15

How many molecules are in 1.00 mol of sulfur dioxide,SO2?

Accepted Answer

A)  64.1 
B)  64.1 × 6.02 × 1023 
C)  12.0 × 1023 
D)  6.02 × 1023 
A)  64.1 
B)  64.1 × 6.02 × 1023 
C)  12.0 × 1023 
D)  6.02 × 1023

Question 16

What type of reaction gives CO2 and H2O as the only products?

Accepted Answer

A)  Complete hydrocarbon combustion 
B)  Acid-base reaction 
C)  Acid-carbonate reaction 
D)  Single-replacement, with an acid and an active metal 
A)  Complete hydrocarbon combustion 
B)  Acid-base reaction 
C)  Acid-carbonate reaction 
D)  Single-replacement, with an acid and an active metal

Question 17

A chemical reaction is at equilibrium when

Accepted Answer

A)  no reactants are changing to products. 
B)  the forward and reverse reactions proceed at the same rate. 
C)  the total mass has become constant. 
D)  the temperature is no longer changing. 
A)  no reactants are changing to products. 
B)  the forward and reverse reactions proceed at the same rate. 
C)  the total mass has become constant. 
D)  the temperature is no longer changing.

Question 18

Name four factors that influence the rate of chemical reactions.

Accepted Answer

Temperatur

Question 19

When the equation NH4NO3→ N2O + H2O is balanced,the total of all the coefficients (both written and "understood")is

Accepted Answer

A)  3. 
B)  4. 
C)  7. 
D)  8. 
A)  3. 
B)  4. 
C)  7. 
D)  8.

Question 20

Which answer is incorrect? A base is a substance that,when dissolved in water,

Accepted Answer

A)  reacts with an acid to neutralize its properties. 
B)  reacts with many metals to liberate O2. 
C)  changes the color of litmus dye from red to blue. 
D)  conducts electricity. 
A)  reacts with an acid to neutralize its properties. 
B)  reacts with many metals to liberate O2. 
C)  changes the color of litmus dye from red to blue. 
D)  conducts electricity.

Exam 13: Chemical Reactions

Which of the following does not take place in a chemical reaction?

Write the balanced chemical equation for the complete combustion of pentane,C5H12.

The coefficients needed to balance the reaction Sb2S3 + HCl → SbCl3 + H2S are,respectively,

According to the Arrhenius theory,basic properties are caused by ______________ ions.

One product of photosynthesis is

The human body contains thousands of catalysts called ______________.

In order,from top to bottom,in the activity series come Li,K,Ba,Na,Al,Zn,Sn,and Pb.Therefore,

By definition,the removal of oxygen from a compound is called

How many moles of He would 3.01 × 1023 helium atoms be?

A substance that increases the rate of a chemical reaction but is not consumed in the reaction is called

A chemical reaction generally has a great effect on an atom's

A solution with a pH of 14 is

When energy is released in a chemical reaction,the reaction is called a(n)______________ reaction.

When the equation Sb2S3 + HCl → SbCl3 + H2S is balanced,the coefficient of H2S is

How many molecules are in 1.00 mol of sulfur dioxide,SO2?

What type of reaction gives CO2 and H2O as the only products?

A chemical reaction is at equilibrium when

Name four factors that influence the rate of chemical reactions.

When the equation NH4NO3→ N2O + H2O is balanced,the total of all the coefficients (both written and "understood")is

Which answer is incorrect? A base is a substance that,when dissolved in water,

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Write the balanced chemical equation for the complete combustion of pentane,C₅H₁₂.

The coefficients needed to balance the reaction Sb₂S₃ + HCl → SbCl₃ + H₂S are,respectively,

How many moles of He would 3.01 × 10²³ helium atoms be?

When the equation Sb₂S₃ + HCl → SbCl₃ + H₂S is balanced,the coefficient of H₂S is

How many molecules are in 1.00 mol of sulfur dioxide,SO₂?

What type of reaction gives CO₂ and H₂O as the only products?

When the equation NH₄NO₃→ N₂O + H₂O is balanced,the total of all the coefficients (both written and "understood")is