1. The Universe is made of matter and energy.
2. Matter is anything that has mass and takes up space.
3. a. Solid b. Liquid c. Gas
4. Getting things to change phase requires energy.
5. When we turn liquid into gas we add/subtract (circle one) energy. → add
6. When we turn liquid into solid we add/subtract (circle one) energy. → subtract
7. Nitrogen makes up 68% of the atmosphere (True/False). → False
8. When a compound changes from a liquid to a gas, its molecules move farther apart and move faster.
9. When a compound changes from a liquid to a solid, its molecules move closer together and slow down.
10. Dry ice is a solid carbon dioxide mixed with some alcohol. → False (Dry ice is solid carbon dioxide; it is not mixed with alcohol.)
11. Absolute zero is the lowest possible temperature, where molecular motion theoretically stops.
12. Scientists cannot cool matter to absolute zero because it is impossible to remove all thermal energy from a system according to the Third Law of Thermodynamics.
13. The job of the cool scientist is to study and understand the behavior of matter at very low temperatures.
14. The CO2 gas is lighter/heavier (circle one) than air. → heavier
15. Gases take the shape of their container.
16. Solids can hold their own shape.
Follow-up Questions:
1. I learned that matter exists in three main phases—solid, liquid, and gas—and that changing between them requires adding or removing energy.
2. Can we ever observe matter at absolute zero?
Parent Tip: Review the logic above to help your child master the concept of bill nye matter worksheet.
