Across
- 4. The name of the element with the symbol H
- 8. The negative particle around the atom
- 9. One of the first two substances leading to the product
- 10. The 5 ( ) in how we make observations
- 11. The element for the air we breathe
- 12. A reaction in which a substance breaks down into two substances
Down
- 1. A reaction resulting in CO2 and H20
- 2. A reaction in which two substances become one
- 3. How we measure a substance's qualities/characteristics
- 5. The neutral particle in the atom
- 6. The positive particle inside the atom
- 7. The relative size of things
- 13. The end result of a chemical reaction