key terms

3. the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.
5. reaction is a reaction in which energy is absorbed
9. when the reaction is complete you have new substances called
10. is material that releaes energy when it burns
13. property is a characteristic of a substance taht describes its abitly to change into other substance
14. system matter is not allowed to eneter or leave
16. a solid that forms from solution during a chemical reaction is called a
19. of mass this principle is call and it states that during q chemical reaction matter created or destroyed
20. system matter can enter from or escape to the surroundings
23. is a number place in foront of a chemcial formula in an eqaution
24. is a material that increases the rate of a reaction be lowering the activation energy.
25. anything that has mass and takes up space

1. change is any change that alter the form or apperance of a substance but that does not make the substance change into another substance.
2. the substance you have at the beginning are called the
4. in chemistry when two or more elements or compounds combine to make more complex susbstance the process is called
6. fire is the result of a rapid reaction between oxygen and a substance called a fuel
7. when one element replaces another in compound or when two elements in different compounds trade places the process is called
8. is the amount of a substance in a given volume
11. energy is the minimum amount of energy needed to start a chemical reaction
12. in contrast to a synthesis reaction a process called breaks down compounds into simpler products
15. equation is a short easy way to show chemical reaction unsing symbols instead of words
17. reaction A change in matter that produces one or more new substances is a chemical change or
18. a material used to decrease the rate of a reaction is an
21. property a characteristic of a substance that can be observed without changing the substance into another substance
22. the cells in your body comtains biological catalysts called