Chemical Reactions

3. A principal that states that during a chemical reaction, matter is not created or destroyed
5. When matter can enter from or escape to the surroundings
11. The substances you have at the beginning
12. A rapid reaction between oxygen and a substance called a fuel
14. A characteristic of a substance that describes its ability to change into another substance
16. A material that increases the rate of a reaction by lowering the activation energy
17. A characteristic of a substance that can be observed without changing the substance into another substance
19. Anything that has mass and takes up space
22. The amount of a substance in a given volume
24. A reaction that releases energy in the form of heat

1. A short easy way to show a chemical reaction using symbols instead of words
2. A solid that forms from solution during a chemical reaction
3. A change in matter that produces one or more new substances
4. When matter is not allowed to enter or leave
6. Any change that alters the form or appearance of a substance but does not make the substance into another substance
7. The process of when two or more elements or compounds combine to make a more complex substance
8. What the cells in your body that contain biological catalyst are called
9. What you have at the end of the reaction, your new substance
10. The study of matter and how matter changes
13. A reaction in which energy is absorbed
15. The process when one element replaces another in a compound or when two elements in a different compounds trade places
18. The minimum amount of energy needed to start a chemical reaction
20. A material used to decrease the rate of a reaction
21. Breaks down compounds into similar products
22. A number placed in front of a chemical formula in an equation
23. A material that releases energy when it burns