Across
- 1. Is a material that increases the rate of a reaction by lowering the activation energy
- 3. Has mass and take up space
- 4. Matter can enter from or escape to the surroundings
- 5. Is a material that releases energy when it bruns
- 6. Solid that forms from a solution during a chemical reaction
- 8. Breaks down compounds into simpler products
- 9. The study of matter and how it changes
- 10. It can be observed without changing a substance into another substance
- 13. When the reaction is complete, you have a substance
- 15. The cells of the body (as in all living things) contain biological catalysts
- 16. The substance you have at the beginning
- 17. The minimum amount of energy needed to start a chemical reaction
- 18. A material used to decrase the rate of a reaction
Down
- 1. A rapid reaction between oxygen and a substance called a fuel
- 2. When one element replaces another in a compound
- 7. Is any change of alters
- 9. Matter is not allowed to enter or leave
- 11. When two or more elements or compounds combine to make a more complex substance
- 12. Substance that describes its abilty to change into other substance
- 14. Is the amonut os a substance in a given volume