Question 1

What can you deduce about the activation energy of a reaction that takes billions of years to go to completion? How about a reaction that takes only fractions of a second?

Accepted Answer

A) The activation energy of both these reactions must be very low. 
B) The activation energy of both these reactions must be very high. 
C) The slow reaction must have a high activation energy while the fast reaction must have a low activation energy. 
D) The slow reaction must have a low activation energy while the fast reaction must have a high activation energy. 
A) The activation energy of both these reactions must be very low. 
B) The activation energy of both these reactions must be very high. 
C) The slow reaction must have a high activation energy while the fast reaction must have a low activation energy. 
D) The slow reaction must have a low activation energy while the fast reaction must have a high activation energy. C

Question 2

How many bonds between nitrogen and hydrogen are formed if you react nitrogen with hydrogen according to the following reaction? N2 + 3H2 → 2 NH3

Accepted Answer

A) 6 
B) 2 
C) 3 
D) 1 
E) 8 
A) 6 
B) 2 
C) 3 
D) 1 
E) 8 A

Question 3

If the relative mass of a pingpong ball is 1/20 that of a golf ball, how many Ping-Pong balls would you need to equal the mass of two golf balls?

Accepted Answer

A) 40 
B) 20 
C) 24 
D) 100 
E) 6.022 × 1023 
A) 40 
B) 20 
C) 24 
D) 100 
E) 6.022 × 1023 A

Question 4

How many moles of H2 bonds are broken if you react nitrogen with hydrogen according to the following reaction? N2 + 3H2 → 2 NH3

Accepted Answer

A) 6 
B) 2 
C) 3 
D) 1 
E) 8 
A) 6 
B) 2 
C) 3 
D) 1 
E) 8

Question 5

What is a reaction rate?

Accepted Answer

A) It is the speed at which reactants are consumed or product is formed. 
B) It is the balanced chemical formula that relates the number of product molecules to reactant molecules. 
C) It is the ratio of the masses of products and reactants. 
D) It is the ratio of the molecular masses of the elements in a given compound. 
E) none of the above 
A) It is the speed at which reactants are consumed or product is formed. 
B) It is the balanced chemical formula that relates the number of product molecules to reactant molecules. 
C) It is the ratio of the masses of products and reactants. 
D) It is the ratio of the molecular masses of the elements in a given compound. 
E) none of the above

Question 6

Balance the following equation. ____ NO → ____ N2O + ____ NO2

Accepted Answer

A) 3, 1, 1 
B) 3, 0, 0 
C) 4, 4, 8 
D) 1, 2, 4 
E) 6, 2, 1 
A) 3, 1, 1 
B) 3, 0, 0 
C) 4, 4, 8 
D) 1, 2, 4 
E) 6, 2, 1

Question 7

The chlorinated fluorocarbons molecules are acting as a(n)________ by converting hundreds of thousands of molecules before they are inactivated.

Accepted Answer

A) catalyst 
B) aerosol 
C) active site 
D) acid 
E) base 
A) catalyst 
B) aerosol 
C) active site 
D) acid 
E) base

Question 8

Which of the following statements about ozone is true?

Accepted Answer

A) Ozone in the stratosphere is beneficial. 
B) Ozone in the troposphere is a pollutant. 
C) Ozone is generated from photochemical reactions of hydrocarbons. 
D) none of the above 
E) both a and b 
A) Ozone in the stratosphere is beneficial. 
B) Ozone in the troposphere is a pollutant. 
C) Ozone is generated from photochemical reactions of hydrocarbons. 
D) none of the above 
E) both a and b

Question 9

Given the following generic chemical reaction, which is the reactant? X → Y

Accepted Answer

A) Y is the reactant. 
B) X is the reactant. 
C) → is the reactant. 
D) Both X and Y are the products. 
E) Both X and Y are the reactants. 
A) Y is the reactant. 
B) X is the reactant. 
C) → is the reactant. 
D) Both X and Y are the products. 
E) Both X and Y are the reactants.

Question 10

Which of the following reaction energies is the least exothermic (but still an exothermic reaction)?

Accepted Answer

A) 540 kJ/mole 
B) -540 kJ/mole 
C) 125 kJ/mole 
D) -125 kJ/mole 
E) not enough information given 
A) 540 kJ/mole 
B) -540 kJ/mole 
C) 125 kJ/mole 
D) -125 kJ/mole 
E) not enough information given

Question 11

How many moles of water,   O, are produced from the reaction of 16 grams methane, C   , with an unlimited supply of oxygen,   . How many grams of   O is this? C   + 2   → C   + 2   O

Accepted Answer

A) 0.889 mole, which is 16 grams 
B) 2.0 moles of water, which is 32 grams 
C) 2.0 moles of water, which is 36 grams 
D) 1.0 mole of water, which is 18 grams 
A) 0.889 mole, which is 16 grams 
B) 2.0 moles of water, which is 32 grams 
C) 2.0 moles of water, which is 36 grams 
D) 1.0 mole of water, which is 18 grams

Question 12

How many grams of water can be formed from the reaction between 10 grams of oxygen and 1 gram of hydrogen?

Accepted Answer

A) 11 grams of water are formed since mass must be conserved. 
B) 10 grams of water are formed since you can't get a greater mass of water produced than oxygen reacting. 
C) 9 grams of water are formed because oxygen and hydrogen react in an 8:1 ratio. 
D) No water is formed because there is insufficient hydrogen to react with the oxygen. 
A) 11 grams of water are formed since mass must be conserved. 
B) 10 grams of water are formed since you can't get a greater mass of water produced than oxygen reacting. 
C) 9 grams of water are formed because oxygen and hydrogen react in an 8:1 ratio. 
D) No water is formed because there is insufficient hydrogen to react with the oxygen.

Question 13

Are the chemical reactions that take place in a disposable battery exothermic or endothermic? Is the reaction going on in a rechargeable battery while it is recharging exothermic or endothermic?

Accepted Answer

A) An operating disposable battery is driven by endothermic reaction, while a recharging rechargeable battery is also driven by endothermic reactions. 
B) An operating disposable battery is driven by exothermic reaction, while a recharging rechargeable battery is driven by endothermic reactions. 
C) An operating disposable battery is driven by endothermic reaction, while a recharging rechargeable battery is driven by exothermic reactions. 
D) An operating disposable battery is driven by exothermic reaction, while a recharging rechargeable battery is also driven by exothermic reactions. 
A) An operating disposable battery is driven by endothermic reaction, while a recharging rechargeable battery is also driven by endothermic reactions. 
B) An operating disposable battery is driven by exothermic reaction, while a recharging rechargeable battery is driven by endothermic reactions. 
C) An operating disposable battery is driven by endothermic reaction, while a recharging rechargeable battery is driven by exothermic reactions. 
D) An operating disposable battery is driven by exothermic reaction, while a recharging rechargeable battery is also driven by exothermic reactions.

Question 14

Which of the above reactions would proceed the fastest?

Accepted Answer

A) a 
B) b 
C) c 
D) all proceed at same rate 
E) not enough information given 
A) a 
B) b 
C) c 
D) all proceed at same rate 
E) not enough information given

Question 15

Chlorine is put into the atmosphere by volcanoes in the form of hydrogen chloride, HCl, but this form of chlorine does not remain in the atmosphere for very long. Why?

Accepted Answer

A) The hydrogen chloride is destroyed by ultraviolet rays. 
B) The hydrogen chloride is washed away by atmospheric moisture. 
C) The hydrogen chloride reacts with atmospheric carbon dioxide. 
D) The hydrogen chloride degenerates into hydrogen,   , and chlorine,   . 
A) The hydrogen chloride is destroyed by ultraviolet rays. 
B) The hydrogen chloride is washed away by atmospheric moisture. 
C) The hydrogen chloride reacts with atmospheric carbon dioxide. 
D) The hydrogen chloride degenerates into hydrogen,   , and chlorine,   .

Question 16

How close are you to a CFC molecule right now?

Accepted Answer

A) It depends upon whether you are in an urban or rural setting. 
B) There are about 25 trillion of them in each liter of air you breathe. 
C) There are about 25 million of them in each liter of air you breathe. 
D) There are about 25 of them in each liter of air you breathe. 
A) It depends upon whether you are in an urban or rural setting. 
B) There are about 25 trillion of them in each liter of air you breathe. 
C) There are about 25 million of them in each liter of air you breathe. 
D) There are about 25 of them in each liter of air you breathe.

Question 17

How is ozone produced in the upper atmosphere?

Accepted Answer

A) It forms by reaction of oxygen molecules with UV light. 
B) It forms by nuclear decomposition of oxygen. 
C) It diffuses from the lower atmosphere. 
D) It forms by the reaction of nitric dioxide and oxygen. 
E) all of the above 
A) It forms by reaction of oxygen molecules with UV light. 
B) It forms by nuclear decomposition of oxygen. 
C) It diffuses from the lower atmosphere. 
D) It forms by the reaction of nitric dioxide and oxygen. 
E) all of the above

Question 18

Why do the natural reactions involving ozone not lead to depletion of the ozone layer?

Accepted Answer

A) Ozone continually rises from the troposphere. 
B) Ozone is too diffuse. 
C) Ozone breaks into fragments that can reassemble into more ozone. 
D) UV radiation generates more ozone. 
E) c and d 
A) Ozone continually rises from the troposphere. 
B) Ozone is too diffuse. 
C) Ozone breaks into fragments that can reassemble into more ozone. 
D) UV radiation generates more ozone. 
E) c and d

Question 19

Explain the connection between photosynthetic life on the earth and the ozone layer.

Accepted Answer

A) They are too distant from one another to be directly related. 
B) The ozone layer protects photosynthetic life from harmful ultraviolet rays. 
C) Photosynthetic plants produce the oxygen from which the ozone layer forms. 
D) Seed pods are carried throughout the globe by currents within the ozone layer. 
A) They are too distant from one another to be directly related. 
B) The ozone layer protects photosynthetic life from harmful ultraviolet rays. 
C) Photosynthetic plants produce the oxygen from which the ozone layer forms. 
D) Seed pods are carried throughout the globe by currents within the ozone layer.

Question 20

Does the ozone pollution from automobiles help alleviate the ozone hole over the South Pole?

Accepted Answer

A) Yes, because ozone is ozone no matter what the source. 
B) No, because the ozone from automobiles is too dense. 
C) Yes, but automobiles haven't been around long enough for the impact to be significant. 
D) No, because the ozone decomposes before reaching the upper atmosphere. 
A) Yes, because ozone is ozone no matter what the source. 
B) No, because the ozone from automobiles is too dense. 
C) Yes, but automobiles haven't been around long enough for the impact to be significant. 
D) No, because the ozone decomposes before reaching the upper atmosphere.

What can you deduce about the activation energy of a reaction that takes billions of years to go to completion? How about a reaction that takes only fractions of a second?

How many bonds between nitrogen and hydrogen are formed if you react nitrogen with hydrogen according to the following reaction? N₂ + 3H₂ → 2 NH₃

If the relative mass of a pingpong ball is 1/20 that of a golf ball, how many Ping-Pong balls would you need to equal the mass of two golf balls?

How many moles of H₂ bonds are broken if you react nitrogen with hydrogen according to the following reaction? N₂+ 3H₂ → 2 NH₃

What is a reaction rate?

Balance the following equation. NO → N₂O + NO₂

The chlorinated fluorocarbons molecules are acting as a(n)________ by converting hundreds of thousands of molecules before they are inactivated.

Which of the following statements about ozone is true?

Given the following generic chemical reaction, which is the reactant? X → Y

Which of the following reaction energies is the least exothermic (but still an exothermic reaction)?

How many moles of water, O, are produced from the reaction of 16 grams methane, C , with an unlimited supply of oxygen, . How many grams of O is this? C + 2 → C + 2 O

How many grams of water can be formed from the reaction between 10 grams of oxygen and 1 gram of hydrogen?

Are the chemical reactions that take place in a disposable battery exothermic or endothermic? Is the reaction going on in a rechargeable battery while it is recharging exothermic or endothermic?

Which of the above reactions would proceed the fastest?

Chlorine is put into the atmosphere by volcanoes in the form of hydrogen chloride, HCl, but this form of chlorine does not remain in the atmosphere for very long. Why?

How close are you to a CFC molecule right now?

How is ozone produced in the upper atmosphere?

Why do the natural reactions involving ozone not lead to depletion of the ozone layer?

Explain the connection between photosynthetic life on the earth and the ozone layer.

Does the ozone pollution from automobiles help alleviate the ozone hole over the South Pole?

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

Filters

Exam 9: How Chemicals React

What can you deduce about the activation energy of a reaction that takes billions of years to go to completion? How about a reaction that takes only fractions of a second?

How many bonds between nitrogen and hydrogen are formed if you react nitrogen with hydrogen according to the following reaction? N2 + 3H2 → 2 NH3

If the relative mass of a pingpong ball is 1/20 that of a golf ball, how many Ping-Pong balls would you need to equal the mass of two golf balls?

How many moles of H2 bonds are broken if you react nitrogen with hydrogen according to the following reaction? N2 + 3H2 → 2 NH3

What is a reaction rate?

Balance the following equation. ____ NO → ____ N2O + ____ NO2

The chlorinated fluorocarbons molecules are acting as a(n)________ by converting hundreds of thousands of molecules before they are inactivated.

Which of the following statements about ozone is true?

Given the following generic chemical reaction, which is the reactant? X → Y

Which of the following reaction energies is the least exothermic (but still an exothermic reaction)?

How many moles of water, O, are produced from the reaction of 16 grams methane, C , with an unlimited supply of oxygen, . How many grams of O is this? C + 2 → C + 2 O

How many grams of water can be formed from the reaction between 10 grams of oxygen and 1 gram of hydrogen?

Are the chemical reactions that take place in a disposable battery exothermic or endothermic? Is the reaction going on in a rechargeable battery while it is recharging exothermic or endothermic?

Which of the above reactions would proceed the fastest?

Chlorine is put into the atmosphere by volcanoes in the form of hydrogen chloride, HCl, but this form of chlorine does not remain in the atmosphere for very long. Why?

How close are you to a CFC molecule right now?

How is ozone produced in the upper atmosphere?

Why do the natural reactions involving ozone not lead to depletion of the ozone layer?

Explain the connection between photosynthetic life on the earth and the ozone layer.

Does the ozone pollution from automobiles help alleviate the ozone hole over the South Pole?

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

Filters

How many bonds between nitrogen and hydrogen are formed if you react nitrogen with hydrogen according to the following reaction? N₂ + 3H₂ → 2 NH₃

How many moles of H₂ bonds are broken if you react nitrogen with hydrogen according to the following reaction? N₂+ 3H₂ → 2 NH₃

Balance the following equation. NO → N₂O + NO₂