Across
- 3. / Soft metal with symbol K
- 5. / A form of matter with uniform composition
- 8. / Solid turning into liquid
- 10. / Two or more elements chemically joined
- 12. / Movement of particles from high to low concentration
- 14. / Liquid turning into vapor
- 15. / Solid changing directly into gas
- 17. / Mixture where one substance dissolves in another
- 18. / Anything that has mass and takes up space
- 19. / Positively charged particle in an atom
- 20. / Two or more atoms bonded together
Down
- 1. / Tiny pieces that make up matter
- 2. / Related to motion or energy of movement
- 4. / Rarest natural alkali metal
- 6. / A pure substance made of only one kind of atom
- 7. / Starting materials in a chemical reaction
- 9. / Force per unit area
- 11. / How clean or unmixed a substance is
- 13. / Mass per unit volume
- 16. / Atoms of the same element with different neutrons