Atoms, Molecules, and Heat Transfer Vocabulary

1. Occurs when a liquid cools to the point at which its particles no longer have enough energy to overcome the force of attraction between them. The particles remain in fixed positions, crowding closely together. A liquid becomes a solid.
7. No definite shape, (takes shape of container), no definite volume. Particles move in random motion with little or no attraction to each other.
9. Anything that has mass and takes up space.
11. The building blocks of matter.
12. The mix of compounds and molecules that can be separated.
13. Heat transfer through a substance by direct contact. Occurs when particles of warmer matter bump into particles of cooler matter and transfer some of their thermal energy to the cooler particles.
14. Resists the transfer of heat.
16. No definite shape (takes the shape of container, definite volume particles are free to move over each other, but are still attracted to each other.
18. How close matter is packed together.
19. Pure elements are made of one kind of atom.

2. The process in which a liquid changes into a gas. Individual liquid particles absorb just enough energy to overcome the force of attraction, they move away from the liquid and move into the air becoming a gas.
3. ENERGY Energy causing the particles of matter to move.
4. Transfer of heat through heat in the form of waves.
5. Occurs when particles of a solid absorb enough energy to partly overcome the force of attraction holding them together. This allows them to move out of their fixed positions and slip over one another. A solid becomes a liquid.
6. More than one atom bonded together.
8. More than one different element bonded together.
10. Heat transfer in liquids and gases as particles circulate in currents.
15. Definite shape definite volume particles vibrate around a fixed axis.
17. The transfer of thermal energy between substances. It can alter the density of a material.