Exothermic And Endothermic Reaactions

Question 1

What is an exothermic reaction?

Answer 1

It is one that transfers energy to the surrounding

Question 2

Give example of exothermic reactions.

Answer 2

Combustion
Many oxidation reactions
Neutralisation
Everyday uses: self-heating cans (e.g. for coffee) and hand warmers

Question 3

What is an endothermic reaction?

Answer 3

It is one that takes energy from the surroundings

Question 4

Give examples of endothermic reactions?

Answer 4

Thermal decomposition

Some sport injury packs are based upon endothermic reactions

Question 5

If a reversible reaction is exothermic reaction in one direction, it is…. in the opposite reaction. What stays the same?

Answer 5

Endothermic

the amount of energy transferred in each case

Question 6

Give an example of an endothermic and endothermic reversible raction.

Answer 6

Hydrates copper sulphate (blue) (endothermic reaction) anhydrous copper sulphate (White) + water

Anhydrous copper sulfate (White) + water (exothermic reaction) hydrates copper sulphate (blue)

Question 7

What happens during a chemical reaction?

Answer 7

Energy is transferred to or from the surroundings