Rates of Reaction

Question 1

What is the rate of reaction?

Answer 1

How fast the reactants are changed into products

Question 2

What affects the rate of reaction?

Answer 2

Temperature
How concentrated the solution is / pressure of gas
Surface Area
Presence of a catalyst

Question 3

How does the temperature affect the rate of reaction

Answer 3

Higher temperatures = higher rate
Move faster, therefore more collisions, therefore energy of collisions is higher.

Question 4

How does the concentation / pressure affect the rate of reaction

Answer 4

Higher concentration / pressure means more particles that are more likely to collide with each other

Question 5

How does smaller solid particles / more surface area affect the rate of reaction

Answer 5

Breaking it into smaller pices will increase its surface area to volume ratio, mroe of the solid will be exposed compared to its overall volume, frequency of collisions will increase

Question 6

What is a Catalyst?

Answer 6

Substance which increases the rate of reaction without being chemically changed or used up in the reaction

Question 7

How does a catalyst increase the rate of reaction

Answer 7

Decreases the activation energy needed for a reaction to occur, more of the particles have at least the minimum amount of energy needed for a reaction to occur when the particles collide.

Question 8

What is Activation Energy

Answer 8

Minimum amount of energy needed for a reaction to occur