3. As a cup of water is heated, the molecules of water will:
Be destroyed
Begin to move faster
Begin to slow down
Increase in mass

4. 2. A rise in the temperature inside a kitchen means there is an increase in the
Density of the air molecules
Number of air molecules
Average size of the air molecules
Average kinetic energy of the air molecules

5. 3. Measurements inside a sealed container show that the pressure exerted by a gas increase as the thermal energy of the gas increases. Which of the following best explains this pressure increase?
The gas molecules stick to the walls of the container
The gas molecules radiate energy in the form of nuclear particles
The gas molecules begin to bond together into heavier molecules
The gas molecules move faster and strike the container walls more frequently

6. 4. Thermal energy is added to four identical 1
4. Thermal energy is added to four identical 1.0kg samples of water at room temperature. Which of the following increases in each sample?
Average charge of an electron
Average density of a nucleus
Average mass of a proton
Average speed of a molecule

7. 5. A window washer noticed that, from the same distance and with no breeze, the smell of ammonia glass cleaner reached him faster on a hot day than on a cold day. Which of the following explains this observation?
Molecules expand at higher temperatures
Molecules move more rapidly at higher temperatures
The convection currents carry molecules at higher temperatures
The chemical reaction of molecules increases at higher temperatures.

8. 6. Two identical beakers each contain 250ml of water
6. Two identical beakers each contain 250ml of water. The temperature of the water is 85C in one beaker and 15C in the other. A drop of red food coloring is placed in each beaker at the same time. What will most likely happen?
The food coloring spreads faster in the 15C beaker than the 85C beaker
The food coloring forms a layer on top of the water because it does not mix with the water
The food coloring spreads faster in the 85C beaker than the 15C beaker
The food coloring will sit at the bottom of both beakers since it will sink when put in water