Rate of reaction

Question 1

What is the rate of a chemical reaction?

Answer 1

How fast the reactants are changed into products

Question 2

What is activation energy?

Answer 2

The minimum amount of energy that particles need to react.

Question 3

What does the rate of a chemical reaction depend on?

Answer 3

• The collision frequency (how often they collide)

- The energy transferred during a collision

Question 4

What factors influence the rate of reaction?

Answer 4

• Temperature
• Concentration of a solution or pressure of a gas
• Surface area
• Catalyst

Question 5

How does increasing the temperature affect the rate of reaction?

Answer 5

• When the temperature is increased, the particles will be moving faster
• If they are moving faster they are also colliding more frequently
• Also the faster they move the more energy they have, so more of the collisions will have enough energy to make the reaction happen

Question 6

How will increasing the concentration or pressure affect the rate of reaction?

Answer 6

• If a solution is more concentrated, that means that there are more particles in the same volume
• Similarly, when the pressure of a gas is increased, it means that the same number of particles occupy a smaller space
• This makes the collisions more frequent

Question 7

How will increasing the surface area affect the rate of reaction?

Answer 7

• If one of the reactants is a solid, then breaking it up into smaller pieces will increase its surface area to volume ratio
• This means that for the same volume, particles will have a greater area to work on
• Therefore, there will be more frequent collisions

Question 8

How does using a catalyst affect the rate of reaction?

Answer 8

• Catalyst decrease the activation energy required for a reaction to occur
• This means that more particles will have enough energy needed for a chemical reaction to happen