Across
- 4. – The smallest unit of an element.
- 5. change – A change where new substances are made.
- 7. point – The temperature at which a solid melts.
- 10. – Elements that are poor conductors and brittle if solid.
- 13. – A state of matter with fixed shape and volume.
- 16. – Two or more substances combined but not chemically bonded.
- 18. – A substance that speeds up a reaction without being used up.
- 19. – When a gas changes back to a liquid.
- 21. – A positively charged particle in an atom.
Down
- 1. change – A change that does not create a new substance.
- 2. – The center of an atom containing protons and neutrons.
- 3. point – The temperature at which a liquid boils.
- 6. – A substance made of two or more elements chemically combined.
- 8. – A state of matter with no fixed shape or volume.
- 9. – Elements that are good conductors of heat and electricity.
- 11. – When a liquid changes to a gas.
- 12. – A state of matter that has a fixed volume but takes the shape of its container.
- 14. table – A chart that organizes all known elements.
- 15. – A process where substances change into new substances.
- 17. – A negatively charged particle orbiting the nucleus.
- 20. – A neutrally charged particle in an atom.