C2 Chemistry - exothermic and endothermic reactions

Question 1

what do exothermic reactions do?

Answer 1

transfer energy to the surroundings

Question 2

what do endothermic reactions do?

Answer 2

reactions take in energy from surroundings

Question 3

in exothermic reactions what energy is it transfered into the surroundings as?

Answer 3

heat energy

Question 4

three examples of exothermic reactions?

Answer 4

combustion
oxidation
neutralisation

Question 5

what are 2 examples of endothermic reactions?

Answer 5

electrolysis

thermal decomposition

Question 6

what are reversible reactions?

Answer 6

the reaction one direction will be endothermic, the other will be exothermic

Question 7

an example of reversible reactions?

Answer 7

decomposition of ammonium chloride

Question 8

what happens in a reversible reaction of the decomposition of ammonium chloride?
forward and backward reactions

Answer 8

forward reaction = it decomposes when heated - energy must be taken from surroundings

backward reaction = energy is transfered to the surroundings when is happens