C10 Rates of Reaction

Question 1

Which 4 factors affect reaction rate?

Answer 1

• Temperature
• Concentration/pressure
• Surface area
• Catalysts

Question 2

In collision theory, which 2 things does reaction rate depend on?

Answer 2

• Collision frequency of reactant particles
• Energy transferred during collision

Question 3

What is the relationship between collision frequency and reaction rate?

Answer 3

Directly proportional

Question 4

What is the activation energy?

Answer 4

The minimum amount of energy needed for a reaction to take place

Question 5

How do catalysts increase the reaction rate?

Answer 5

By providing an alternative reaction pathway with a lower activation energy

Question 6

What is a precipitate?

Answer 6

A solid that forms in a solution during a chemical reaction

Question 7

Describe a method that can be used to measure the rate of reaction that produces gaseous products:

Answer 7

Place the reaction vessel onto a mass balance, add the reactants and insert a piece of cotton wool to ensure non-gaseous reactants can’t get out. Measure the time and change in mass.

Question 8

What is the advantage of using a gas syringe?

Answer 8

Minimises release of potentially harmful gases

Question 9

How does increasing temperatures increase reaction rate?

Answer 9

• Increases number of particles that collide with enough (kinetic) energy
• Increased number of collisions (more motion due to kinetic energy)

Question 10

What is the disadvantage of using a gas syringe?

Answer 10

The plunger could blow out the end if the reaction is too vigorous,

Question 11

What name is given to similar results obtained on different days under the same
conditions by the same person?

Answer 11

Repeatable