Across
- 1. The process where gas turns into a liquid when cooled.
- 3. The process where a liquid turns into a gas at the surface, even below its boiling point.
- 7. The physical forms of matter: solid, liquid, and gas.
- 9. A combination of substances that are not chemically bonded.
- 11. Anything that has mass and takes up space.
- 12. A substance made of two or more elements chemically bonded.
Down
- 2. A pure substance made of only one type of atom.
- 4. A model that explains that all matter is made up of tiny moving particles.
- 5. The smallest unit of an element that retains its properties.
- 6. A space with no matter.
- 8. A horizontal row in the periodic table where properties change gradually across.
- 10. A vertical column in the periodic table with elements having similar properties.