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2. Evidence of a chemical reaction, often indicating the formation of a gas.
8. A number placed in front of a chemical formula to balance a chemical equation.
9. A small number in a chemical formula indicating the number of atoms of an element.
10. A substance that undergoes change during a chemical reaction.
11. A type of chemical reaction in which two or more substances combine to form one product.
12. A chemical reaction involving oxygen that is the process of burning.
13. AB + CD -> AD + CB
15. A reaction where a compound breaks down into simpler substances.
16. The principle stating that matter is not created or destroyed in a chemical reaction.
17. An indication that a chemical reaction when a yellow banana turns brown.
18. A substance that is formed as a result of a chemical reaction.

1. A chemical equation in which the number of atoms for each element is equal on both sides.
3. A reaction where one element replaces another in a compound.
4. A term used to describe a substance dissolved in water.
5. A solid that forms and settles out of a liquid mixture during a chemical reaction.
6. A sign of a chemical reaction we saw with fire
7. A process in which substances interact to form new substances.
14. The symbol in a chemical equation that reads as yields.