Science

2. – Two or more atoms bonded together.
4. – A very small piece of matter (like an atom or molecule).
5. – To decrease in volume or draw together (often when cooled).
6. – To increase in volume or spread out (often when heated).
10. – To change from a liquid to a gas at the surface of the liquid.
11. – Matter with a definite volume but no definite shape; particles are close but can slide past each other.
13. – Matter with a definite shape and volume; particles are tightly packed and vibrate in place.
14. – To change from a solid to a liquid when heat is added.
16. – The spreading of particles from an area of high concentration to an area of low concentration.
17. – Matter with no definite shape or volume; particles are far apart and move freely.

1. Point – The temperature at which a liquid changes to a solid.
3. – To change from a liquid to a solid when heat is removed.
5. – To change from a gas to a liquid when heat is removed.
7. – A high-energy state of matter where particles are charged (ions and electrons); found in stars and lightning.
8. Point – The temperature at which a solid changes to a liquid.
9. – Anything that has mass and takes up space.
12. – The smallest unit of an element; made of protons, neutrons, and electrons.
15. Point – The temperature at which a liquid changes to a gas throughout the liquid.
16. – The amount of mass in a given volume (how tightly matter is packed).