B. What happens to the molecules as they begin to boil?

When water is boiled, the heat energy is transferred to the molecules of water, which begin to move more quickly. Eventually, the molecules have too much energy to stay connected as a liquid. When this occurs, they form gaseous molecules of water vapor, which float to the surface as bubbles and travel into the air.

When water is boiled, the heat energy is transferred to the molecules of water, which start to move faster. Eventually they have too much energy to stay a liquid. They begin to form gaseous molecules of water vapor, which then float to the surface as bubbles and travel into the air.

the answer is c. nacl