Heat 6.p.2.2

Anita heats a beaker containing water. As the temperature of the water increases, which change to the water molecules occurs?

• The molecules move at a faster rate.
• The molecules become more massive.
• The molecules separate into hydrogen and oxygen.

What happens at the boiling point of a substance?

• liquid becomes a gas
• solid becomes a gas
• liquid becomes a solid
• solid becomes a liquid

What types of particles have the least amount of kinetic energy?

• ice particles
• air particles
• skin particles
• liquid water particles

At what temperature is water most likely to be in vapor form?

• –10°C
• 20°C
• 90°C
• 120°C

When ice melts, it becomes a

• solid
• liquid`
• gas
• plasma

Which of these is an example of water changing from water vapor to liquid?

• moisture forming on a mirror when you breathe on it
• sweat forming on your body when you exercise
• ice cubes melting when you put them in a warm liquid
• rivers drying up during a very hot summer

When the wax from a candle drips, the wax has reached

• its boiling point
• its melting point.
• a chemical change.
• a physical change.

What has occurred when bubbles form in a liquid that is being heated?

• Oxygen is absorbed from the air.
• Heat is radiating in the liquid.
• The boiling point has been reached.
• Molecular stability in the liquid is increasing

The ice cubes in a freezer are melting. Which change most likely is causing the ice cubes to melt?

• a decrease in the mass of the ice cubes
• an increase in the mass of the ice cubes
• a decrease in the temperature inside the freezer
• an increase in the temperature inside the freezer

When liquid water freezes, it forms ice. What is the physical state of an ice cube?

• gas
• solid
• liquid
• plasma