I need help please please

What happens to atoms and chemical bonds during a reaction?

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

Wind and moving water provide energy. question 1 options: chemical mechanical thermal none of the above