What is the fundamental concept that liquids, gases, and solids are all made of?

• Energy

• Atoms

• Matter

• Molecules

What happens to water molecules when liquid water is heated and changes into water vapor?

• They lose energy and move slower.

• They gain energy and move faster.

• They change their chemical structure.

• They become visible.

What is required to change a liquid into a solid?

• Adding heat

• Removing heat

• Increasing pressure

• Decreasing volume

What is the invisible gas produced when water boils?

• Steam

• Oxygen

• Water vapor

• Hydrogen

How many phases of matter are commonly discussed?

• Two

• Three

• Four

• Five

What happens to the pressure inside a container as the molecules inside move slower?

• The pressure increases.

• The pressure decreases.

• The pressure remains the same.

• The pressure fluctuates unpredictably.

What is the theoretical temperature at which all molecular motion completely stops?

• Freezing point

• Boiling point

• Absolute zero

• Critical temperature

Are you enjoying the video lesson?

• Yes

• No

What state change occurs when solid carbon dioxide (dry ice) is placed in warm water?

• Melting into a liquid.

• Evaporation into a gas.

• Sublimation directly into a gas.

• Condensation into a liquid.

What happens to a carbonated drink if there is no carbonation in it?

• It becomes sweeter.

• It becomes really flat.

• It changes color.

• It freezes instantly.