Chemical Energy A2 98 – 101

Question 1

What is an endothermic reaction?

Answer 1

Energy is transferred from the surroundings to the reactants, theres a temperature decrease. So the energy in that reaction is decreased as its taken by the reactants, causing the temperature decrease.

Question 2

What is an exothermic reaction?

Answer 2

Energy is transferred to the surroundings from the reactants, theres a temperature increase. The energy in that reaction os reduced as it releases the enrgy tot he surroundings, causing the temperature increase.
(energy exits

Question 3

State if melting ice is an endothermic or exothermic reaction and why.

Answer 3

It is endothermic because, it gets energy from its surroundings as it melts.

Question 4

State if freezing water to ice is an endothermic or exothermic reaction and why.

Answer 4

Its an exothermic reaction because energy is released to the usrroundings as the water freezes.