Chapter 5

2. matter that does not leave.
3. new substance that form
6. the amount of substance in a given volume.
7. biological catalysts in your body.
9. substances that undergo change
10. any change that alters appearance
13. increases the reaction rate by lowering the activation energy needed.
15. more energy that is required breakthe bonds of reactants than is released.
16. a number placed in front of a chemical formula in an equation.
17. a way to show a chemical reaction, using symbols instead of words.
18. matter than can escape or enter to the surroundings.

1. the minimum amount of energy needed to start a chemical reaction.
4. a solid that forms liquids during chemical reactions.
5. the energy released as the products form is greater than the energy required to break the bonds.
8. when two elements trade places
11. atoms that rearrange to form new substances
12. a reaction that occurs when compounds break down into simpler products.
14. when two or more elements or compounds combine to make a more complex substance.