Chemical Reactions

3. A sign of a chemical reaction is unexpected _____ change, like in handwarmers.
7. The atoms in ____ form a repeating pattern.
8. Heating a chemical reaction usually causes it to _____ up.
9. The ____ points to the products in a chemical reaction.
10. A physical change does NOT result in a new _____.
11. Burning is a chemical change because a ___ substance is made.
12. A physical change that can happen to ice cubes.
14. Adding a ____ can speed up a chemical reaction.
16. Molecules with low melting points are ___ molecules.
20. A solid formed from two liquids during a chemical reaction is called a ____.
22. One of the products from burning methane is _____.
23. Adding more reactants to a chemical reaction would produce more ____.

1. Burning a marshmallow is a _____.
2. One sign of a chemical reaction is the formation of gas, which usually looks like ____.
4. Cutting an apple in half is a _____.
5. A chemical change that iron can undergo is _____.
6. Salt has more than one element bonded together so it is a ____ molecule.
12. Air is a ___ of gases that can be separate.
13. A physical change of paper that results in smaller pieces.
15. A chemical reaction that can happen to a silver spoon.
17. An example of an ____ is oxygen.
18. A chemical reaction must be _____.
19. The bonds in the _____ are broken during a chemical reaction.
21. Breaking apart ____ yields hydrogen and oxygen.