1. Approximately how many atoms are in a penny? O 100
O 1,000,000
O 2.4 * 1022
O 1,000

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.