1. What are the three states of matter?

2. What do the dots represent in the illustration?

3. What is matter made of?

4. What do the lines that connect the dots represent?

5. Count the dots in each state. Which state has more atoms?

Which state has less atoms? Explain why.

6. For most substances, their solid state is more dense than their liquid state. How is water different? Why is the fact that ice is lighter than liquid water important for life on earth?

7. What does heating and cooling do to substance’s state of matter?

8. Fill in with a state of matter (Liquid, Solid, or Gas).

Heating: ________________→ _________________→_________________.

Cooling: ________________→ _________________→_________________.

9. What is it called when: 

A. Solid goes to liquid?______________________________

B. Liquid goes to gas?______________________________

C. Gas goes to liquid?______________________________

D. Liquid goes to solid?______________________________

10. Are water molecules sticky or slippery? Explain why.

11. Explain how heat changes ice to liquid water. 

12. Explain how heat changes a liquid water to a gas vapor.

13. Explain how cooling changes a gas to liquid. 

14. Explain how cooling changes a liquid to a solid.

15. Does heating always raise an object’s temperature? Explain.

16. Why is evaporation a cooling process? 

17. Why can you float a pin, which is more dense than water, on the surface of water? 

18. What is water in the state of gas called?

19. What are your three best water question

20. Draw the very bipolar water molecule.