1. The universe is made of matter and energy.
2. Solid, liquid, gas.
3. A solid has a definite shape and volume; a liquid has a definite volume but takes the shape of its container.
4. Energy (heat or cold) is needed to change a phase of matter.
5. A refrigerator cools food by removing heat energy from inside the unit.
6. Changing a solid to a liquid to a gas requires adding energy (heat).
7. Nitrogen is a liquid at -196°C. Nitrogen makes up 78% of the air we breathe.
8. When water vapor in the air condenses, it releases heat energy into the surrounding air.
9. Dry ice is solid carbon dioxide.
10. The slower molecules move, the lower the temperature.
11. Absolute zero is when molecules cease to move completely.
12. Solid: rigid shape, fixed volume; Liquid: flows, fixed volume; Gas: expands to fill container, no fixed shape or volume.
Parent Tip: Review the logic above to help your child master the concept of bill nye phases of matter worksheet.
