2.4 - Rate of reaction change

Question 1

3 ways to measure gases in reactions

Answer 1

1. Use a gas syringe
2. Measure the mass of reaction before and after
3. Upturned measuring cylinder filled with water

Question 2

What is a catalyst?

Answer 2

A substance that speeds up a reaction and is not used up

Question 3

How can a rate of a reaction be increased? (5)

Answer 3

• increasing the solutions concentration
• raising pressure of a gas
• increasing the surface area of a solid
• increasing the temperature
• adding a catalyst

Question 4

What is the activation energy?

Answer 4

The minimum energy required for a reaction to occur

Question 5

What is a risk of HCL?

Answer 5

It is an irritant so could splash in someones eyes but can be prevented by wearing safety goggles

Question 6

What is a risk of sulphur dioxide?

Answer 6

The gas could be breathed in and cause coughing or an asthma attack but can be reduced by wearing a mask or use a fume cupboard

Question 7

How is the activation energy lowered?

Answer 7

By a catalyst, there are more collisions every second so the reaction happens faster

Question 8

What is the importance of developing new catalysts?

Answer 8

To increase yields

• preserve raw materials
• reduce energy costs

Question 9

What is the collision theory

Answer 9

When the temperature is higher the particles have more energy so they collide more frequently, and the collisions have more energy so there are more successful collisions

Question 10

Surface area

Answer 10

More chance for the particles to collide successfully if the surface area is large