14.1 The Progress of Chemical Reactions

Multiple Choice

What is the activation energy in a reaction?

• The energy needed for products to be formed

• The energy needed to break products into reactants

• The minimum energy needed for products to make reactants

• The minimum energy needed by reactants for bonds to be broken and new bonds to form for products to be created

Multiple Choice

Which aspect of the graph correlates with the activation energy?

• A

• B

• C

• D

Multiple Choice

Which letter corresponds to the energy of the products?

• A

• B

• C

• D

Multiple Choice

Which letter corresponds to the energy of the reactants?

• A

• B

• C

• D

Multiple Choice

Increase in temperature of the reactants can do one of the following

• Slow collision frequency

• Allow less effective collision between the particles

• Cause particles to lose speed

• Increase collision between the particles thus increasing the rate.

Multiple Choice

Which letter corresponds to the activation energy of the forward reaction?

• A

• B

• C

• D

Multiple Choice

Which factors increase the rate of a reaction.

• increasing temperature

• increasing concentration

• increasing surface area

• all of these

Multiple Choice

A graph of all the energy changes that occur as reactants are converted to products in a chemical reaction.

• A reaction progress curve

• A reaction heating curve.

• A reaction cooling curve

Multiple Choice

An intermediate has a more stable structure and a longer lifetime than an activated complex.

• True

• False

Multiple Choice

Intermediates appear in the overall chemical equation for a reaction.

• True

• False

Multiple Choice

In a multistep chemical reaction, the fastest step will determine, or limit, the rate of the overall reaction.

• True

• False

Multiple Choice

How does a catalyst work in speeding up a reaction?

• By giving them more energy

• By lowering the activation energy or reaction

• By making them more available

Multiple Choice

The minimum amount of energy needed for colliding particles to react is called the

• Chemical Energy

• Kinetic Energy

• Activation Energy

• Potential Energy

Multiple Choice

A catalyst increases the efficiency of collisions between reactants.

• true

• false

Multiple Choice

What is the name given to a catalyst in the human body?

• Biology

• Catalyst

• Chemical

• Enzyme

Multiple Choice

Which of the reaction pathway shows the catalysed reaction?

• red

• blue

Multiple Choice

When a catalyst is added to a reaction the rate of reaction,,,

• Increases

• Decreases

• Does not change

Multiple Choice

Catalysts permit reactions to proceed along a ___________energy path.

• lower

• higher