Across
- 1. a chemical reaction that breaks down compounds into simpler products
- 3. a material that releases energy when it burns
- 6. system a system in which matter can enter from or escape to the surrounding
- 9. property
- 10. the amount of one material in a certain volume of another material
- 12. a biological catalyst that lowers the activation energy of reaction in cells
- 13. that has mass and take up space
- 15. a substance formed as a result of a chemical reaction
- 17. a chemical reaction in which two or more simple substance combine to form a new,more complex substance
- 18. reaction in which substance undergo chemical change that result in the formation of a new substance
- 21. a material that decreases the rate of a reaction
- 23. a material that increases the rate of a reaction by lowering the activation energy
Down
- 2. a number in front of a chemical formula in a equation that indicates how many molecules or atom of each reactant and product are involved in a reaction
- 4. reaction that releases energy in the form of heat.
- 5. of mass the principle stating that matter is not created or destroyed during a chemical reaction
- 7. a rapid reaction between oxygen and fuel that results in fire
- 8. a reaction in which one element replaces another in a compound.
- 11. the study of the properties of matter and how matter change
- 14. reaction that absorbs energy in the form of heat.
- 16. property a substance that describes its ability to change into different substances
- 18. system a system in which no matter is allowed to enter or leave
- 19. energy the minimum amount of energy needed to get a chemical reaction started
- 20. equation a short way to show a chemical reaction using symbols.
- 22. a substance that enters into a chemical reaction