Collision Theory, Reactions, Catalysts Flashcards Preview

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Flashcards in Collision Theory, Reactions, Catalysts Deck (18):
1

What happens when the temperature is increased?

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

2

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

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

3

What does larger surface area mean in terms of reaction ?

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

4

What is the definition of a catalyst?

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

5

How does a solid catalyst work?

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

6

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

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

7

How do catalysts reduce the energy costs for industrial purpose?

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

8

Name the disadvantages of using the catalyst

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

9

What is an exothermic reaction?

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

10

What is the best example of an exothermic reaction?

Burning fuels which is called combustion

11

Name three exothermic reactions

1) Burning fuels

2) neutralisation reactions

3) oxidisation reactions

12

What is an endothermic reaction?

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

13

When do endothermic reactions take place?

In thermal decomposition

14

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

They must collide with enough energy

15

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

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

16

Give a definition of a catalyst

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

17

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

The temperature will decrease

18

What is the collision theory?

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