Question 1

In a temperature vs. heat diagram, such as Figure 5, what does a plateau represent?

Accepted Answer

A) An equilibrium adjustment 
B) The loss of heat 
C) The addition of heat 
D) A phase change 
A) An equilibrium adjustment 
B) The loss of heat 
C) The addition of heat 
D) A phase change

Question 2

What physical phenomenon is used to separate the compounds in crude oil?

Accepted Answer

A) Melting point 
B) Boiling point 
C) Phase change 
D) Combustion pressure 
A) Melting point 
B) Boiling point 
C) Phase change 
D) Combustion pressure

Question 3

What is the oxidation number of carbon in the products of this reaction 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O?

Accepted Answer

A) +4 
B) 0 
C) -4 
D) There is not enough information to tell. 
A) +4 
B) 0 
C) -4 
D) There is not enough information to tell.

Question 4

How is the complete combustion of ethanol (C2H5OH) in oxygen gas represented?

Accepted Answer

A) 2 C2H5OH + 2 O2 → 4 CO2 + 6 H2O 
B) 2 C2H5OH + 7 O2 → 4 CO2 + 6 H2O 
C) C2H5OH + 7 O2 → 4 CO2 + 6 H2O 
D) C2H5OH + 4 O2 → 4 CO2 + 6 H2O 
A) 2 C2H5OH + 2 O2 → 4 CO2 + 6 H2O 
B) 2 C2H5OH + 7 O2 → 4 CO2 + 6 H2O 
C) C2H5OH + 7 O2 → 4 CO2 + 6 H2O 
D) C2H5OH + 4 O2 → 4 CO2 + 6 H2O

Question 5

What phase must a sample be in when it is run through a gas chromatograph?

Accepted Answer

The answer of What phase must a sample be in...

Question 6

The total combustion of sugar, C6H12O6, in oxygen is which of the following?

Accepted Answer

A) C6H12O6 + O2 → 6 CO2 + H2O 
B) 2 C6H12O6 + 12 O2 → 12 CO2 + 6 H2O 
C) 2 C6H12O6 + 6 O2 → 6 CO2 + 6 H2O 
D) C6H12O6 + 6 O2 → 6 CO2 + 6 H2O 
A) C6H12O6 + O2 → 6 CO2 + H2O 
B) 2 C6H12O6 + 12 O2 → 12 CO2 + 6 H2O 
C) 2 C6H12O6 + 6 O2 → 6 CO2 + 6 H2O 
D) C6H12O6 + 6 O2 → 6 CO2 + 6 H2O

Question 7

Which of the following materials found in a fire give clues to the temperature of the fire?

Accepted Answer

A) Water and plastics from household materials 
B) Copper from wiring 
C) Steel from furniture parts 
D) Both B and C 
A) Water and plastics from household materials 
B) Copper from wiring 
C) Steel from furniture parts 
D) Both B and C

Question 8

Diesel fuel is what fraction of crude oil refinement?

Accepted Answer

A) C1 to C4 
B) C5 to C9 
C) C10 to C16 
D) C14 to C20 
A) C1 to C4 
B) C5 to C9 
C) C10 to C16 
D) C14 to C20

Question 9

Even though no gasoline or paint thinner traces had been found on Kenny Richey, why did the prosecutor's office go forward with the case?

Accepted Answer

A) He had been involved in several arsons in the past. 
B) He had an established record of assault and petty theft. 
C) He had bragged to friends that evening that he was going to commit this arson. 
D) None of the above; rather, they didn't go forward with the case. 
A) He had been involved in several arsons in the past. 
B) He had an established record of assault and petty theft. 
C) He had bragged to friends that evening that he was going to commit this arson. 
D) None of the above; rather, they didn't go forward with the case.

Question 10

A piece of aluminum of unknown mass that starts at 95°C is immersed in a calorimeter with 400 g of water at 25.0°C, and the resultant temperature of the water is 35.0°C. What is the mass of the aluminum?

Accepted Answer

A) 309.9 g 
B) 16,736 g 
C) 54.0 g 
D) 278.9 g 
A) 309.9 g 
B) 16,736 g 
C) 54.0 g 
D) 278.9 g

Question 11

What occurs in a chemical reaction when the activation energy is not achieved?

Accepted Answer

A) The reactants explode. 
B) The reaction can only proceed slowly. 
C) The reaction does not proceed. 
D) The reactants degrade. 
A) The reactants explode. 
B) The reaction can only proceed slowly. 
C) The reaction does not proceed. 
D) The reactants degrade.

Question 12

The complete combustion of wood has carbon dioxide as one of its products.

Accepted Answer

A) True 
 B)False

Question 13

How is a flammable liquid defined?

Accepted Answer

A) A liquid that will produce vapors that support combustion at 37.8°C or less 
B) A liquid that will produce vapors that support combustion at 100°C or less 
C) A gas that will produce vapors that support combustion at 37.8°C or less 
D) A gas that will produce vapors that support combustion at 100°C or less 
A) A liquid that will produce vapors that support combustion at 37.8°C or less 
B) A liquid that will produce vapors that support combustion at 100°C or less 
C) A gas that will produce vapors that support combustion at 37.8°C or less 
D) A gas that will produce vapors that support combustion at 100°C or less

Question 14

How does the oxidation number of C change in the following reaction: CH4 + 2 O2 → CO2 + 2 H2O?

Accepted Answer

A) There is not enough information to tell. 
B) It does not change. 
C) From -2 to +2 
D) From -4 to +4 
A) There is not enough information to tell. 
B) It does not change. 
C) From -2 to +2 
D) From -4 to +4

Question 15

What ingredients are needed for a fire?

Accepted Answer

A) A fuel source 
B) Oxygen gas 
C) Heat 
D) All of the above 
A) A fuel source 
B) Oxygen gas 
C) Heat 
D) All of the above

Question 16

What is the oxidation number of oxygen in the compound CaO?

Accepted Answer

The answer of What is the oxidation number of oxygen...

Question 17

What does a cone heater measure while heating a sample?

Accepted Answer

A) The oxygen in the air above the burning object 
B) The oxygen in the burning sample 
C) The amount of sample combusted 
D) The amount of sample mixed with oxygen 
A) The oxygen in the air above the burning object 
B) The oxygen in the burning sample 
C) The amount of sample combusted 
D) The amount of sample mixed with oxygen

Question 18

What amount of heat is evolved when a piece of concrete rises in temperature from 27ºC to 50ºC?

Accepted Answer

A) 40.0 J 
B) 21.6 J 
C) 18.4 J 
D) Not enough information to tell 
A) 40.0 J 
B) 21.6 J 
C) 18.4 J 
D) Not enough information to tell

Question 19

What products occur under ideal conditions in any combustion reaction?

Accepted Answer

A) Carbon oxides 
B) Carbon dioxide 
C) Carbon dioxide and water 
D) Carbon oxides and water 
A) Carbon oxides 
B) Carbon dioxide 
C) Carbon dioxide and water 
D) Carbon oxides and water

Question 20

Why are some wood-based smokes white and others black?

Accepted Answer

A) It depends on the completeness of the burning. 
B) It depends upon the water content of the wood being burned. 
C) It depends on the color of the wood being burned. 
D) It depends on the size of the wood being burned. 
A) It depends on the completeness of the burning. 
B) It depends upon the water content of the wood being burned. 
C) It depends on the color of the wood being burned. 
D) It depends on the size of the wood being burned.

In a temperature vs. heat diagram, such as Figure 5, what does a plateau represent?

What physical phenomenon is used to separate the compounds in crude oil?

What is the oxidation number of carbon in the products of this reaction 2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O?

How is the complete combustion of ethanol (C₂H₅OH) in oxygen gas represented?

What phase must a sample be in when it is run through a gas chromatograph?

The total combustion of sugar, C₆H₁₂O₆, in oxygen is which of the following?

Which of the following materials found in a fire give clues to the temperature of the fire?

Diesel fuel is what fraction of crude oil refinement?

Even though no gasoline or paint thinner traces had been found on Kenny Richey, why did the prosecutor's office go forward with the case?

A piece of aluminum of unknown mass that starts at 95°C is immersed in a calorimeter with 400 g of water at 25.0°C, and the resultant temperature of the water is 35.0°C. What is the mass of the aluminum?

What occurs in a chemical reaction when the activation energy is not achieved?

The complete combustion of wood has carbon dioxide as one of its products.

How is a flammable liquid defined?

How does the oxidation number of C change in the following reaction: CH₄ + 2 O₂ → CO₂ + 2 H₂O?

What ingredients are needed for a fire?

What is the oxidation number of oxygen in the compound CaO?

What does a cone heater measure while heating a sample?

What amount of heat is evolved when a piece of concrete rises in temperature from 27ºC to 50ºC?

What products occur under ideal conditions in any combustion reaction?

Why are some wood-based smokes white and others black?

Understanding Our World With Chemistry

Matter: Properties, Changes and Measurements

Understanding Atoms

Bonding and Reactions

Chemistry of Bonding: Structure and Function of Drug Molecules

Aqueous Solutions: Part I

Aqueous Solutions: Part II

Organic Chemistry and Polymers

Chemistry of Explosions

Applications of Chemical Kinetics

Nuclear Chemistry: Energy, Medicine, Weapons, and Terrorism

Chemical Equilibrium

Introduction to Biochemistry

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Exam 9: Chemistry of Fire and Heat

In a temperature vs. heat diagram, such as Figure 5, what does a plateau represent?

What physical phenomenon is used to separate the compounds in crude oil?

What is the oxidation number of carbon in the products of this reaction 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O?

How is the complete combustion of ethanol (C2H5OH) in oxygen gas represented?

What phase must a sample be in when it is run through a gas chromatograph?

The total combustion of sugar, C6H12O6, in oxygen is which of the following?

Which of the following materials found in a fire give clues to the temperature of the fire?

Diesel fuel is what fraction of crude oil refinement?

Even though no gasoline or paint thinner traces had been found on Kenny Richey, why did the prosecutor's office go forward with the case?

A piece of aluminum of unknown mass that starts at 95°C is immersed in a calorimeter with 400 g of water at 25.0°C, and the resultant temperature of the water is 35.0°C. What is the mass of the aluminum?

What occurs in a chemical reaction when the activation energy is not achieved?

The complete combustion of wood has carbon dioxide as one of its products.

How is a flammable liquid defined?

How does the oxidation number of C change in the following reaction: CH4 + 2 O2 → CO2 + 2 H2O?

What ingredients are needed for a fire?

What is the oxidation number of oxygen in the compound CaO?

What does a cone heater measure while heating a sample?

What amount of heat is evolved when a piece of concrete rises in temperature from 27ºC to 50ºC?

What products occur under ideal conditions in any combustion reaction?

Why are some wood-based smokes white and others black?

Understanding Our World With Chemistry

Matter: Properties, Changes and Measurements

Understanding Atoms

Bonding and Reactions

Chemistry of Bonding: Structure and Function of Drug Molecules

Aqueous Solutions: Part I

Aqueous Solutions: Part II

Organic Chemistry and Polymers

Chemistry of Explosions

Applications of Chemical Kinetics

Nuclear Chemistry: Energy, Medicine, Weapons, and Terrorism

Chemical Equilibrium

Introduction to Biochemistry

Filters

What is the oxidation number of carbon in the products of this reaction 2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O?

How is the complete combustion of ethanol (C₂H₅OH) in oxygen gas represented?

The total combustion of sugar, C₆H₁₂O₆, in oxygen is which of the following?

How does the oxidation number of C change in the following reaction: CH₄ + 2 O₂ → CO₂ + 2 H₂O?