Reactions Crossword

4. A substance made of two or more atoms chemically joined together.
6. When observing a chemical reaction, you might feel the chemicals change in temperature.
7. A change in which atoms are rearranged to create a new substance.
8. When a chemical reaction occurs, energy is transferred to or from the surroundings.
10. A chemical reaction in which a compound breaks down into simpler parts.
13. A possible source of danger.
14. A change which transfers energy from the surroundings.
15. The starting substances in a chemical reaction.

1. Changes of state and dissolving are physical changes.
2. Something used to speed up a chemical reaction.
3. A change which transfers energy to the surroundings.
4. A chemical reaction with oxygen that gives out light and heat.
5. Type of reaction in which you cannot get back the substances you started with.
9. Protective equipment worn in a lab.
11. The resulting substances in a chemical reaction.
12. A chemical formula shows how many atoms of each elements are in a compound.