Describe the transfer of energy that occurs in the reaction shown in figure 1

Exothermic reaction

Explanation:

The change in energy occurs when the reactants have different amount of chemical energy stored in them. The exothermic reactions releases energy into the surroundings when the reactants combine. The combustion reaction is an exothermic reaction as the heat is released in to the environment.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.