Amplify Phase Change Review

What phase change is occurring to this ice cream?

• melting

• freezing

• condensation

• evaporation

A student left a sealed jar of water outside her home. Water can be a solid, liquid, or gas. When she put it outside, the water was a liquid. Twelve hours later, the water had changed phase and was a solid. What happened to the water molecules?

• Before the student left, the molecules were moving in place. After, the molecules were moving around each other.

• Before the student left, the molecules were moving around each other. After, the molecules were moving away from each other.

• Before the student left, the molecules were flowing around each other. After, the molecules were moving in place.

• Before the student left, the molecules were moving away from each other. After, the molecules were moving around each other.

The pull between two molecules that holds them together

• Kinetic Energy

• Molecular Attraction

• Molecule

Of the following, which is the best description of the freedom of movement in liquids?

• molecules only move in place, not around each other

• molecules move around, not away from each other

• molecules move away from each other

• molecules are charged and move away from each other

Scientists put a sample of water into a sealed tank. At first, the water was a liquid. Then, the scientists transferred energy (heat) out of the substance, and the water changed phase. What happened to the movement of the water molecules?

After the phase change, the water molecules moved . . .

• faster and started moving away from each other.

• faster and started moving around each other.

• slower and started moving in place.

• slower and started moving around each other.

The energy that an object has because it is moving

• Molecule

• Refute

• Density

• Kinetic Energy

Which statement is true about the molecule model shown?

• Model B represents a solid with the most kinetic energy.

• Model C represents a gas with the most kinetic energy.

• Model A represents a solid with the least kinetic energy.

• Model B represents a liquid with a medium amount of and kinetic energy.

A phase change occurs when the _____ increases .

• temperature

• kinetic energy

• heat

• potential energy

Jose's go cart is made of steel which is a solid. When are the steel molecules in his bicycle moving?

• They are only moving when Jamil is riding his bicycle.

• They are only moving when Jamil is not riding his bicycle.

• They are always vibrating.

• They are never moving.

What happens to molecules when their kinetic energy decreases?

• They move slower.

• They move faster.

• They get heavier.

• It depends on the type of molecules.