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5. When a gas changes straight to a solid
7. When liquid changes to gas because increase in energy
11. Change in the molecular structure
13. Heat always moves from warmer to _____ objects
14. Has weak molecular attraction, lots of energy, and no volume
18. 2 or more atoms chemically combined
19. Any liquid, solid, or gas that can flow
21. Movement of thermal energy between substances that are different temperatures
22. Changing position over time
23. Has strong molecular attraction, less energy, and has volume
24. Transfer of heat by electromagnetic waves

1. Change in appearance
2. Made the law stating when temperature increases, volume increases, pressure constant
3. The movement of heat by a fluid such as water
4. When a solid changes straight to a gas
6. Average kinetic energy
8. Made the law stating when temperature increases, pressure increases, volume constant
9. The energy of motion
10. When a gas changes to a liquid
12. The only way to keep something from cooling is to keep it somewhere just as ___
13. Transfer of energy by direct contact
15. When a liquid changes to a solid
16. How much space something takes up
17. Made the law stating when volume decreases, pressure increases, temperature constant
20. When a solid changes to liquid