5.5.1.1 energy transfer during exothermic and endothermic reactions

Question 1

How much energy comes out of any reaction?

Answer 1

The same amount in which the reaction began with
What comes in must come out
-the law of conservation energy

Question 2

If a reaction transfers energy to the surroundings.. the product molecules must have more or less energy than the reactants?

Answer 2

Less. Must have less.

Question 3

Does an exothermic reaction transfer/consume energy from/to the surroundings?

Answer 3

They transfer energy to the surroundings, the temperature of the surroundings then increases.

Question 4

Name 3 reactions which are exothermic

Answer 4

Combustion, many oxidation reactions and neutralisation

Question 5

Name 2 uses of exothermic reactions

Answer 5

Self-heating can and hand warmers

Question 6

Does an endothermic reaction transfer/consume energy from/to the surroundings?

Answer 6

They take in energy from the surroundings, the temperature of the surroundings decreases.

Question 7

Name 3 examples of endothermic reactions

Answer 7

Thermal decomposition, the reaction of citric acid and sodium hydrogen carbonate and some sport injury packs.