C8 Rates Of Reaction

Question 1

When can chemical reactions occur?

Answer 1

Chemical reactions can occur only when reaction particals collide with each other in the correct orientation and with enough energy

Question 2

What is the minium amount of energy called for it to react?

Answer 2

Activation energy

Question 3

What do you need to follow the rates of reaction

Answer 3

Cotton wool
Conical flask
Reactants
Scale

Question 4

Explain why reaction is fastest at the beginning and then slow down

Answer 4

The reaction is the fastest at the start because the most reactant is at the start so then the successful collision between the parcticals become more frequent

Question 5

Explain why reactions stop

Answer 5

The reactions stop because the product that is reaction would have run out

Question 6

Why is the cotton wool placed in the conical flask in this experiment

Answer 6

To stop the liquid escaping

Question 7

Why the rate of reaction is lower at 30 seconds than at 0 seconds

Answer 7

Less reactant particals volume
fewer collisions
Fewer successful collision

Question 8

What is the aim of the rhubarb reaction

Answer 8

To see how changing the surface area of the rhubarb affects the rate of reaction

Question 9

What does increasing the surface area mean ?

Answer 9

Increasing the surface area means that the object has either doubled in size or bigger

Question 10

What is the prediction of the concentration of rate of reaction

Answer 10

Increasing the concentration of a reactant will increase the rate of reaction because it increases the number of reactant particals in a certain volume or per cm3