Rates of Reaction

Question 1

Explain how changing concentration or pressure affects rates of reactions

Answer 1

If the concentration of a dissolved reactant is increased, or the pressure of a reacting gas is increased:
There are more reactant particles in the same volume
There is a greater chance of the particles colliding
The rate of reaction increases

Question 2

Explain how changing particle size affects rates of reactions

Answer 2

If a solid reactant is broken into small pieces or ground into a powder:Its surface area is increased. More particles are exposed to the other reactant. There is a greater chance of the particles colliding. The rate of reaction increases. Changing the temperature

Question 3

Explain how changing temperature affects rates of reactions

Answer 3

The reactant particles move more quickly.More particles have the activation energy or greater. The particles collide more often, and more of the collisions result in a reaction. The rate of reaction increases.

Question 4

Explain how using a catalyst speeds up the rate of reaction?

Answer 4

Catalysts increase the rate of reaction without being used up. They do this by lowering the activation energy needed. With a catalyst, more collisions result in a reaction, so the rate of reaction increases. Different reactions need different catalysts.

Question 5

What is the reactant

Answer 5

What is present at the begging of a reaction

Question 6

What is a product?

Answer 6

What is formed by the reaction

Question 7

What is a catylst

Answer 7

Something which changes the reaction without changing itself

Question 8

What is the activation energy

Answer 8

The minimum amount of energy for the particles to react