G10-Q4-Worksheet 1

Name:

What does the term "activation energy" refer to?

• A) Energy released during a reaction
• B) The energy in the products
• C) The minimum energy needed to start a reaction
• D) Energy stored in reactants

In lighting a match, what provides the activation energy?

• A) Oxygen
• B) The wood
• C) Friction
• D) Heat from a flame

What is a reaction intermediate?

• A) A catalyst
• B) The final product
• C) A reactant
• D) A substance formed in an earlier step and used in a later step

What determines the rate of a multistep reaction?

• A) The last step
• B) The step with the least energy
• C) The fastest step
• D) The slowest step

What is the role of a catalyst in a chemical reaction?

• A) Increases reactant concentration
• B) Increases temperature
• C) Lowers activation energy
• D) Increases energy of products

Which of the following does NOT change the activation energy?

• A) Catalyst
• B) Enzyme
• C) Increasing temperature
• D) None of the above

Why do catalysts speed up reactions?

• A) They raise the temperature
• B) They react with all the products
• C) They provide energy
• D) They allow more collisions to have enough energy

What would most likely happen if the temperature of a reaction increases?

• A) The reaction slows down
• B) The number of collisions decreases
• C) The activation energy increases
• D) The reaction rate increases

A catalyst:

• A) Is a product
• B) Is a reactant
• C) Is unchanged at the end of the reaction
• D) Raises the energy of activation