Rates of Reaction

Question 1

What is the difference between a chemical and physical change?

Answer 1

A physical change does not alter the identity of a substance and is reversible.
A chemical change alters the identity of a substance and cannot be (easily) reversed.

Question 2

What are examples of chemical changes?

Answer 2

• color change
• odor change
• effervescence

Question 3

Is change in state a chemical or physical change?

Answer 3

Physical

Question 4

What are 5 factors that affect the rate of reaction?

Answer 4

• concentration of reactants
• particle size
• catalysts
• temperature
• surface area

Question 5

In terms of collision success and frequency, what are the effects of concentration of reactants on reaction rate?

Answer 5

It will increase the number of collisions but will not give these more energy.

Question 6

In terms of collision success and frequency, what are the effects of temperature on reaction rate?

Answer 6

It will increase the amount of collisions as well as the amount of successful collisions since it gives particles more energy to react (activation energy)