Year 9 Revision

Products will form faster if____________

• the particle size of the reactants are larger.
• temperature is decreased.
• concentration of the reactants are increased.
• the reaction is not stirred.

Smaller particle size allows for a _________ surface area to be exposed for the reaction.

• larger

• smaller

• rectangular

• spherical

The rate of a reaction increases as temperature__________________.

• Decreases
• Increases
• Stays the Same

Which of A, B or C represents the fastest reaction rate?

• A

• B

• C

• They are all as fast as they end up in the same spot

Where is the reaction rate the fastest?

• A

• B

• C

• Not enough information

Where is the reaction rate the slowest?

• A

• B

• C

• Not enough information

What happens to the graph line when the chemical reaction has ended?

• It goes to zero

• It is horizontal

• It is vertical

• It crosses the y-axis

A steeper part of the graph means the gradient is _______, so the rate of reaction is ________

• large/faster

• large/slower

• small/faster

• small/slower

When has the reaction ended?

• after 60s

• after 70s

• after 80s

• after 50s

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.