Rates of reaction

Question 1

The rate of reaction depends on the

Answer 1

Number of collisions.

Question 2

Collision theory

Answer 2

Reactions can only happen when the reactant particles collide. Most collisions aren’t successful in forming product molecules despite the high rate of collisions.

Question 3

Reason as to why most collisions are unsuccessful

Answer 3

Particles have a wide range of kinetic energy BUT only a small fraction of particles have enough kinetic energy to break the original bonds and form new ones.

Question 4

Terminology for minimum kinetic energy required

Answer 4

Activation energy.

Question 5

What are ‘fruitful collisions’?

Answer 5

The minority high kinetic energy collisions between particles which do not produce a chemical change.

Question 6

Factors that effect the rate of reaction(three)

Answer 6

Temperature.
Concentration of particles.
Surface area/Size of particles.

Question 7

How does the size of particles effect the rate of reaction?

Answer 7

Smaller particles have a larger surface area for collisions to occur, therefore have a faster rate of reaction.

Question 8

Effect of using a catalyst in a reaction

Answer 8

They help break chemical bonds in reactant molecules and provide a ‘different pathway’ for the reaction. Basically activation energy is reduced.

Question 9

Measure the rate of reaction?

Answer 9

Gas syringe and beaker containing liquid and reactants. Measure how much gas is produced in a specific amount of time.