Reactions Crossword

3. A substance made of two or more atoms chemically joined together.
5. A change which transfers energy to the surroundings.
7. When observing a chemical reaction, you might feel the chemicals change in temperature.
9. A chemical formula shows how many atoms of each elements are in a compound.
11. A change which transfers energy from the surroundings.
13. The starting substances in a chemical reaction.
14. Something used to speed up a chemical reaction.
15. Protective equipment worn in a lab.
16. Type of reaction in which you cannot get back the substances you started with.

1. A chemical reaction in which a compound breaks down into simpler parts.
2. A chemical reaction with oxygen that gives out light and heat.
4. The resulting substances in a chemical reaction.
6. A possible source of danger.
8. When a chemical reaction occurs, energy is transferred to or from the surroundings.
10. A change in which atoms are rearranged to create a new substance.
12. Changes of state and dissolving are physical changes.