Collision Theory, Reactions, Catalysts

Question 1

What happens when the temperature is increased?

Answer 1

When the temperature is increased the particles all move quicker , if they’re moving quicker theyre going to collide more often

Question 2

What does it mean in terms of reaction when is solution is made more concentrated?

Answer 2

It means there are more particles of reactant between the water molecules which makes collisions more likely

Question 3

What does larger surface area mean in terms of reaction ?

Answer 3

This means the particles around The broken up reactant will have more area to work on so there will be more frequent collisions

Question 4

What is the definition of a catalyst?

Answer 4

A catalyst is a substance which speeds up a reaction without being changed or used up in the reaction

Question 5

How does a solid catalyst work?

Answer 5

A solid catalyst works by giving the reacting particles a surface to stick to which increases the number of successful collisions

Question 6

What is the main advantage of using a catalyst for industrial purposes?

Answer 6

Catalysts increase the rate of reaction, which saves a lot of money as the plant doesn’t need to operate for as long to produce the same amount of stuff

Question 7

How do catalysts reduce the energy costs for industrial purpose?

Answer 7

A catalyst will allow the reaction to work at a much lower temperature which reduces the energy used up in the reaction which is good for sustainable development to save money

Question 8

Name the disadvantages of using the catalyst

Answer 8

1) expensive to buy and after need to be removed from the product and cleaned
2) different reactions use different catalysts so if you make more than one product at your plant you’re probably need to buy different catalysts
3) Catalysts can be poisoned by impurities and stop working

Question 9

What is an exothermic reaction?

Answer 9

An exothermic reaction gives out energy to the surroundings in the form of heat and shown by a rise in temperature

Question 10

What is the best example of an exothermic reaction?

Answer 10

Burning fuels which is called combustion

Question 11

Name three exothermic reactions

Answer 11

1) Burning fuels
2) neutralisation reactions
3) oxidisation reactions

Question 12

What is an endothermic reaction?

Answer 12

An endothermic reaction takes in energy from the surroundings in the form of heat and shown by a fall in temperature

Question 13

When do endothermic reactions take place?

Answer 13

In thermal decomposition

Question 14

According to the collision theory what must happen in order for two particles to react?

Answer 14

They must collide with enough energy

Question 15

Why doesn’t increase in concentration of solutions increase the rate of reaction?

Answer 15

There will be more frequent collisions so the rate of reaction will increase

Question 16

Give a definition of a catalyst

Answer 16

A catalyst is a substance which speeds up a reaction without being used up in the reaction

Question 17

And endothermic reaction happens when ammonium nitrate is dissolved in water. Predict how the temperature of the solution will change during the solution

Answer 17

The temperature will decrease

Question 18

What is the collision theory?

Answer 18

The collision theory just says that the rate of a reaction simply depends on how often and how hard the reacting particles collide with each other