Across
- 4. A short, easy way to show a chemical reaction, using symbols
- 9. The amount of one material in a certain volume of another material
- 12. A system in which no matter is allowed to enter or leave
- 13. A characteristic of a substance that can be observed without changing the substance into another substance
- 15. A reaction that absorbs energy in the form of heat
- 17. A substance that enters into a chemical reaction
- 18. A material that releases energy when it burns
- 19. A material that decreases the rate of a reaction
Down
- 1. A reaction that releases energy in form of heat
- 2. The minimum amount of energy needed to get a chemical reaction started
- 3. The principle stating that matter is not created or destroyed during a chemical reaction
- 5. A characteristic of of a substance that describes its ability to change into different substances
- 6. The process in which substances undergo chemical changes that result in the formation of new substances
- 7. A solid that forms from a solution during a chemical reaction
- 8. The study of properties of matter and how matter changes
- 9. A rapid reaction between oxygen and fuel that results in fire
- 10. A substance formed as a result of a chemical reaction
- 11. A biological catalyst that lowers the activation energy of reactions in cells
- 13. A change that alters the form or appearance of a material but does not make the material into another substance
- 14. Anything that has mass and occupies space
- 16. A material that increases the rate of a reaction by lowering the activation energy