10.Reactions depending on energy exchange

Question 1

Exothermic reaction(example)

Answer 1

An exothermic reaction releases energy, the energy of the reactants is higher than the products. The value of the energy is negative.
Ex:paper burning

Question 2

Endothermic reaction(example)

Answer 2

An endothermic reaction absorbs the energy, the energy of the reactant is lower than the products. The value of the energy is positive.
Ex:vinegar and sodium bicarbonate

Question 3

What does chemical energy depend on

Answer 3

Chemical energy depends on the stability of their chemical bonds, the stabler the bonds, the less energy a substance has.

Question 4

Draw the exothermic and endothermic reaction diagram

Answer 4

Answer in notes