Question 1

During the carbon cycle plants produce the oxygen that is consumed by animals.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following is the best definition of a catalyst?

Accepted Answer

A)   A catalyst is a material that speeds up the rate of a chemical reaction.
B)   A catalyst is a material that speeds up the rate of a chemical reaction without participating in the reaction.
C)   A catalyst is a material that speeds up the rate of a chemical reaction without being consumed during the reaction.
D)   All of the above are equally good definitions.

Question 3

A block of iron forming a pool of the liquid metal is correctly classified as

Accepted Answer

A)   a chemical change.
B)   a physical change.
C)   both a chemical and a physical change.
D)   neither a chemical nor a physical change.

Question 4

Which of the following symbols is used to denote a reversible reaction?

Accepted Answer

A)   →
B)   ←
C)   
D)   ↔

Question 5

Consider the following image representing an equilibrium mixture. The black spheres represent the reactant and the gray spheres the product.  This reaction was started with only reactants present. If the reaction had been started with only product present, the equilibrium mixture would contain 4 gray spheres and 8 black spheres.

Accepted Answer

A) True 
 B)False

Question 6

If a reaction occurs very rapidly, even at a relatively low temperature, which of the following is probably true?

Accepted Answer

A)   The reaction is endothermic.
B)   The reaction is exothermic.
C)   The reaction has a low activation energy.
D)   The reaction is at equilibrium.

Question 7

Which of the following most closely defines the term "reaction rate"?

Accepted Answer

A)   the temperature needed to initiate a reaction
B)   the position of a reaction at equilibrium
C)   the speed of a reaction
D)   the activation energy in the presence of a catalyst

Question 8

Decreasing the temperature will decrease the number of collisions that result in product formation.

Accepted Answer

A) True 
 B)False

Exam 6: Chemical Reactions

A block of iron forming a pool of the liquid metal is correctly classified as

Correct Answer
verified

Which of the following most closely defines the term "reaction rate"?

Correct Answer
verified

If a reaction occurs very rapidly, even at a relatively low temperature, which of the following is probably true?

Correct Answer
verified

Decreasing the temperature will decrease the number of collisions that result in product formation.

Correct Answer
verified

Which of the following symbols is used to denote a reversible reaction?

Correct Answer
verified

During the carbon cycle plants produce the oxygen that is consumed by animals.

Correct Answer
verified

Correct Answer
verified

Which of the following is the best definition of a catalyst?

Correct Answer
verified

Exam 6: Chemical Reactions

A block of iron forming a pool of the liquid metal is correctly classified as

Correct AnswerverifiedShow Answer

Which of the following most closely defines the term "reaction rate"?

Correct AnswerverifiedShow Answer

If a reaction occurs very rapidly, even at a relatively low temperature, which of the following is probably true?

Correct AnswerverifiedShow Answer

Decreasing the temperature will decrease the number of collisions that result in product formation.

Correct AnswerverifiedShow Answer

Which of the following symbols is used to denote a reversible reaction?

Correct AnswerverifiedShow Answer

During the carbon cycle plants produce the oxygen that is consumed by animals.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following is the best definition of a catalyst?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified