Across
- 3. Gas humans breathe in that plants release
- 6. Uniform mixture of two or more substances
- 9. Tool used to measure temperature
- 11. Process that separates liquids by boiling points
- 14. Scientist who organized the periodic table
- 16. Technique to determine concentration using a standard solution
- 18. Element with the chemical symbol Na
- 19. Starting substance in a chemical reaction
- 20. Smallest unit of matter
- 21. Two or more atoms bonded together
Down
- 1. Dye that changes color in acids/bases
- 2. Color of universal indicator in a neutral solution
- 4. Negatively charged subatomic particle
- 5. Substance that speeds up a reaction but isn’t used up
- 7. Solid changing directly to gas
- 8. Lightest element; part of water and many compounds
- 10. Process that absorbs heat from surroundings
- 12. Metal that rusts easily when exposed to air and water
- 13. Gas used in balloons because it’s lighter than air
- 15. Change of liquid to gas at the surface
- 17. tube Small cylindrical glass container used in labs