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Exam 6: Chemical Reactions

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Question 41

Multiple Choice

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

A) →
B) ←
C)
D) ↔

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Question 42

Multiple Choice

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

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.

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Question 43

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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.

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

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

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

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

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