C2 - Exothermic & Endothermic Reactions

Question 0

Is exothermic or endothermic rarer?

Answer 0

Endothermic reactions are rarer

Question 1

What is an exothermic reaction?

Answer 1

A chemical reaction that transfers heat to the surroundings

Question 2

What is an endothermic reaction?

Answer 2

A chemical reaction that absorbs heat from the surroundings

Question 3

Give 3 ways in which exothermic reactions are used

Answer 3

Heating
Generating electricity
Self-heating cans

Question 4

Give 2 ways in which endothermic reactions are used

Answer 4

Ice packs for injuries

Self-cooling cans for drinks

Question 5

What is a reversible reaction?

Answer 5

A reaction where the end products can react back into the original reactants

Question 6

How do we show a reaction is reversible in a chemical formula?

Answer 6

Double-headed arrow

Question 7

What is the industrial problem with reversible reactions?

Answer 7

If the reactants and products can’t escape the reaction area, the reaction would reach a state of equilibrium and the products would turn into the reactants just as much as the other way round

Question 8

What is dynamic equilibrium?

Answer 8

When 2 conflicting sources make a reversible reaction not lose or gain any more products

Question 9

What relates exothermic / endothermic and reversible reactions?

Answer 9

The forward reaction would be exothermic / endothermic and the backward reaction would be the opposite

Question 10

What are the 3 main exothermic reactions?

Answer 10

Burning fuels

Neutralisation reactions

Oxidation reactions

Question 11

What is the main endothermic reaction?

Answer 11

When calcium carbonate thermally decomposes to form calcium oxide and carbon dioxide