3b

Question 1

Catalyst

Answer 1

• Increases the rate of reaction by providing an alternative pathway with lower activation energy.
• Chemically unchanged at the end of the reaction.

Question 2

Rate of reaction factors

Answer 2

• Surface area
• Temperature
• Concentration/Pressure
• Catalyst

Question 3

Rate of reaction

Answer 3

A measure of how quickly a reactant is used up or a product is formed

Question 4

Conditions for chemical reactions

Answer 4

• Reactant particles must collide with each other (Affected by concentration/pressure or surface area)
• The particles must have enough energy for them to react (affected by temperature or catalyst)

Question 5

Concentration/Pressure

Answer 5

Increasing concentration in solution or pressure in gases increases the rate of reaction:
- Particles are close together
- Collision frequency increases
- More chances of a successful collision

Question 6

Temperature

Answer 6

Increasing temperature increases rate of reaction:
- Particles have more energy and move quicker
- Collision frequency with energy needed increases
- More chances of a successful collision

Question 7

Surface area

Answer 7

Increasing surface are increases rate of reaction (Powders have a higher surface are than lumps):
- More area exposed, there are more places for collision to occur
- Collision frequency increases
- More chances of a successful collision