Collision Theory Quiz

What are the tiny ____ that represent what everything is made of?

• Bits

• Particles

• Molecules

• Cells

What is a chemical reaction?

• A process where substances are mixed without changing

• A process where substances change into new substances

• A process where substances are cooled

• A process where substances are heated

How is a chemical change different from a physical change?

• Chemical change involves a change in state only

• Chemical change creates new substances

• Chemical change involves only temperature change

• Chemical change involves only size change

Why do particles need energy to react?

• To stay still

• To collide with each other

• To change color

• To become larger so they close the gap

What is the minimum amount of energy needed to start a chemical reaction called?

• Kinetic energy

• Potential energy

• Activation energy

• Thermal energy

What must happen for a chemical reaction to take place?

• Activation energy must be provided.

• The temperature must be below freezing.

• The reaction must occur in a vacuum.

• The reactants must be solid.

What are the ways that the frequency of reaction can be increased?

• Add water
• Change in pressure, space, volume and surface area

• Use a larger container
• Temperature, concentration, surface area, and use a catalyst.

What is activation energy?

• The energy required to start a reaction.

• The energy released by a reaction.

• The energy stored in products.

• The energy lost as heat.

What happens if there is no spark in a petrol engine?

• The engine will start.

• The engine will not start.

• The engine will overheat.

• The engine will run faster.

Why won’t cooking reactions happen in a cold pan?

• The pan is too clean.

• There is not enough activation energy.

• The food is too fresh.

• There is not enough catalyst.