Across
- 4. when a compound breaks down in to two different substances
- 7. is when matter does not enter or leave
- 10. is when energy released as the products form is greater than the energy required to break the bonds of the reactions
- 12. the Law states that during a chemical reaction matter is not created or destroyed
- 14. a change that alters the form or appearance of a substance
- 16. the new substances that form
- 17. substances that undergo the chemical changes
- 18. when two or more elements combine to make a more complex substance
- 19. is a change in matter that produces one or more substances
Down
- 1. more energy is required to break bonds of the reactions than his released by the formation of the products
- 2. increases the reaction rate by lowering the activation energy needed
- 3. matter can enter from or escape to the surroundings
- 5. mixing of two liquids may form
- 6. when one element replaces another in a compound
- 7. is the amount of a substance in a given volume
- 8. a material used to describe the rate of a chemical reaction
- 9. the minimum amount of energy to start a chemical
- 11. biological catalysts
- 13. is away to show a chemical reaction using symbols instead of words
- 15. a number placed in front of a chemical formula in an equation