Currents Mid-Unit Formative Assessment

When a water bottle has been heated, what happens to the water molecules inside the bottle?

• The molecules start to move faster and collide with each other and the sides of the container. Because of the increase in collisions, the water molecules take up less space and the water level falls.

• The molecules start to move slower and avoid each other and the sides of the container. Because of the decrease in collisions, the water molecules take up more space and the water level rises.

• The molecules start to move faster and collide with each other and the sides of the container. Because the increase in collisions, the water molecules take up more space and the water level rises.

• The molecules start to move slower and avoid each other and the sides of the container. Because of the decrease in collisions, the water molecules take up less space and the water level falls.

A bottle of water is taken out of the shade and put in bright sunlight for a while. Which statement below best describes the water molecules in the bottle?

• They move faster in the sunlight and slower in the shade.

• They do not change their speed when moved to the sunlight.

• They are not affected by the sunlight or the shade.

• They move faster in the shade and slower in the sunlight.

When you heat a bottle of air and a bottle of water, why does the temperature in the air bottle go up more quickly than the temperature in the water bottle?

• Molecules in the water bottle can absorb more energy before moving.

• Molecules in the air bottle can absorb more energy before moving.

• There are fewer molecules in the water bottle to heat up.

• There are more molecules in the air bottle to heat up.

Which one heats/cools faster, water or rocks? Why?

• Water heats/cools faster because of the shape of the water molecule.

• Rocks heats/cool faster because of the shape of the water molecule.

• Water heats/cools faster because it is less dense.

The island of Nantucket is surrounded by ocean. What keeps the temperatures on Nantucket from being really cold in the winter and really hot in the summer.

• The ocean has very salty water.

• The ocean absorbs the Sun's heat energy and releases it slowly.

• The Atlantic Ocean has water that is less salty than other oceans.

• The ocean absorbs the Sun's heat energy and releases it quickly.