5.2 Reaction Rate Notes

Multiple Choice

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

• Slow collision frequency
• Allow less effective collision between the particles
• Neutralise the reaction
• increase collision between the particles thus increasing the rate.

Multiple Choice

To slow down a chemical reaction you will do one of the following:

• Place the reactants in hot water
• Place the products in ice bath
• Place the reactants in a ice bath
• Keep stirring the reactants with a stirring rod

Multiple Choice

How could we make this reaction happen more quickly?

• Decrease the concentration of the acid

• crush the chalk to increase the surface area

• Put the test tube in an ice bath

Multiple Choice

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

• chemical energy.

• kinetic energy.

• activation energy.

• potential energy.

Multiple Choice

What happens to particles as they heat up?

• they slow down

• nothing

• they stop moving

• they speed up

Multiple Choice

Products will form faster during a chemical reaction if

• the particle size of the reactants are larger.

• temperature is decreased.

• concentration of the reactants are increased.

• the reaction is not stirred.

Multiple Choice

What is the purpose of a catalyst?

• they help to slow down a reaction

• they raise the activation energy

• they lower the activation energy

• they are consumed by the reaction

Multiple Choice

The following graph shows two different reaction pathways for the same overall reaction at the same temperature.

Which pathway is slower and why?

• red, because the activation energy is larger

• blue, because the activation energy is lower

• both reactions progress at the same rate

Multiple Choice

Increasing pressure causes the reacting particles

• to bond together

• to repel from each other

• gain more kinetic energy

• to move closer together

Multiple Choice

What type of reaction is this?

• Endothermic
• Exothermic