Chemistry

6. A number in front of a chemical formula
8. A solid that forms from a solution during a chemical reaction
11. Easy way to show a chemical reaction, using symbols
12. Biological catalyst that lowers the activation energy of reaction in cells
13. Material the decreases the rate of a reaction
15. Study of the properties of matter and how it changes
16. A substance that enters into a chemical reaction
19. Process in which a substances undergo chemical changes that result in new substances
21. System in which matter can enter and exit into the surroundings
24. Principle stating that matter is not created or destroyed during a chemical reaction
25. Chemical reaction in which two or more simple substances form a complex substance
26. Reaction in which one element replaces another in a compound

1. A reaction that absorbs energy in the form of heat
2. Anything that has mass and takes up space
3. Change that alters the appearance of a material that doesn’t change the material into a different substance
4. Minimum amount of energy needed to get a chemical reaction started
5. A reaction that releases energy in the form of heat
7. Chemical reaction that breaks down compound into simpler products
9. Characteristic of a substance that describes its ability to change into different substances
10. Amount of one material in a certain volume of another material
14. A rapid reaction between oxygen and fuel that results in a fire
17. A material that releases energy when it is burned
18. System in which no matter is allowed to enter of exit
20. Characteristic of a substance that can be seen without changing the substance
22. A substance formed as a result of a chemical reaction
23. Material that increases the rate of a reaction by lowering the activation energy