Chemical

3. change- A change that alters the form or appearance of substance but that does not make the substance into another substance.
7. equation- A short, easy way to show a chemical reaction, using symbols instead of words.
9. Anything that has mass and takes up space.
10. When two or more elements or compounds combine to make a more complex substance.
11. When the reaction is complete, you have new substances.
14. system- When matte can enter from or escape to the surroundings.
19. A solid that forms from solution during a chemical reaction.
21. of matter- A principle that states that during a chemical reaction, matter is not created or destroyed.

1. A material that releases energy when it burns.
2. reaction- A change in matter that produces one or more new substances.
4. system- When matter is not allowed t enter or leave.
5. A number placed in front of a chemical formula in a equation
6. property- A characteristic of a substance that describes its ability to change into other substances.
8. In contrast to a synthesis reaction.
12. Substances you have at the beginning.
13. A rapid reaction between oxygen and a substance.
15. property- A characteristic of a substance that can be observed without changing.
16. reaction- A reaction that releases energy in a form of heat.
17. When one element replaces another in a compound or when two elements in a different compounds trade places.
18. The study of matter and how matter changes.
20. reaction- A reaction in which energy is absorbed.