Complete the statement below with all that apply.

average speed is what?

=force × distance a. work b. velocity c. pressure d. momentum

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

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?