Chapter 5 vocabulary MF

3. A chemical reaction in which two or more simple substances combine to form new more complex substances.
7. A solid in which the atoms arranged in a pattern that repeats again and again.
10. A reaction that absorbs energy.
12. A material that decreases the rate of a reaction.
13. A Substance that enters into a chemical reaction.
14. A reaction in which one element replaces another in a compound or when two elements in different compounds trade places.
15. A solid that forms a solution during a chemical reaction.
17. A short easy way shows a chemical reaction using symbols.
19. A chemical reaction that breaks down compounds into simpler products.
20. A type of protein that spreads up a chemical reaction in a living thing a biological catalyst.

1. A system in which no matter is allowed to enter or leave.
2. A substance formed as a result of a chemical reaction.
4. The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change.
5. A change in which one or more substances combine or break apart to a new substances.
6. A reaction that releases energy usually in the form of heat.
8. The minimum amount of energy needed to start a chemical reaction.
9. The amount of one material in a certain volume of another material.
11. A change that alters the form or appearance of material but does not make the material into another substance.
16. A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
18. A system in which can enter from or escape to the surroundings.