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GCSE Chemistry > Rates Of Reaction > Flashcards

Flashcards in Rates Of Reaction Deck (25):
1

What are the 4 things rate if of reaction depends on?

- temperature
- pressure / concentration
- catalyst
- size of particles / surface area

2

Why does a higher temperature increase the rate of reaction?

When temperature the particles have more energy and move quicker. This means they collide more frequently

3

Why does a higher concentration increase the rate of reaction?

There are more particles of the reactant knocking about between the water molecules which makes the collisions between the important more likely

4

Why does a higher pressure increase the rate of reaction?

It means the particle are more squashed together so they collide more frequently

5

Why does a larger surface area increase the rate of reaction?

Th particles around it in the solution will have more area to work on, so there'll be more useful collisions more often

6

Why does using a catalyst increase the rate of reaction?

They increase the number of successful collisions by lowering the activation energy

7

What is an exothermic reaction?

A reaction that gives out energy to the surroundings

8

What is an endothermic reaction?

A reaction which takes in energy from the surroundings

9

What is a reversible reaction?

Where the products can themselves react to produce the original products

10

Give two features of dynamic equilibrium

1. Rate of forward reaction = rate of backward reaction
2. Concentration of products and reactants remain stay constant

11

What is equation for the haber process?

N2 + 3H2 -> 2NH3

12

How is the hydrogen obtained?

From the air

13

How is the hydrogen obtained?

From natural gas or cracking hydrocarbons

14

What is the pressure required for the haber process?

200 atmospheres

15

What is the temperature for the haber process?

450*c

16

What is the catalyst for the haber process?

Iron

17

In the haber process, is the forward reaction endo or exothermic?

Exothermic

18

What is ammonia used for ?

To make nitric acid or fertilisers

19

What is the contact process used to make?

Sulfuric acid

20

What is the equation for the 1st reaction in the contact process?

S + O2 -> SO2

21

How is Sulfuric trioxide formed in the contact process?

2SO2 + 02 -> 2SO3

22

How is oleum formed in the contact process?

SO3 + H2SO4 - H2S2O7

23

How is the oleum turned to Sulfuric acid in the contact process?

H2S2O7 + H2O -> 2H2SO4

24

What are the conditions for the contact process?

450*c
2 atmospheres
Vanadium (V) Oxide, V2O5

25

Give three uses of Sulfuric acid in modern industry?

Manufacture of - fertilisers, paints, detergents