Exothermic and endothermic reactions

Question 1

During chemical reactions what can be said about the energy in the surroundings?

Answer 1

Energy is either transferred to or from the surroundings.

Question 2

An exothermic reaction is one that does what?

Answer 2

Transfers energy to the surroundings (gives it out).

Question 3

Examples of exothermic reactions:

Answer 3

Combustion.
many oxidation reactions.
Neutralisation.

Question 4

Everyday examples of exothermic reactions:

Answer 4

Self heating cans (eg: for coffee).

Hand warmers.

Question 5

An endothermic reaction is one that does what?

Answer 5

Transfers energy from the surroundings (uses it).

Question 6

Examples of endothermic reactions:

Answer 6

Thermal decompositions.

Question 7

Everyday examples of endothermic reactions:

Answer 7

Sports injury packs.

Question 8

If a reversible reaction is exothermic one way, what is it the other way?

Answer 8

Endothermic.

Question 9

What can be said about the energy in a endo/exothermic reversible reaction?

Answer 9

The amount of energy transferred each way is the same.