Across
- 3. when one element replaces another in a compound
- 7. A change that alters the appearance
- 9. The new substances that are formed
- 10. Used to decrease the speed of chemical reactions.
- 12. states that matter isn’t destroyed or created
- 14. Provide a surface for reactions to take place
- 15. increases the reaction rate
- 16. When matter changes to form a new substance
- 17. The minimum amount needed to start chemical reactions
Down
- 1. When the bonds can’t break down the product, this normally produces heat
- 2. Numbers used to balance the chemical equation
- 4. When more energy is required to break the bonds of the reactants
- 5. A way to show chemical reactions using symbols
- 6. When two compounds break down to form simple elements
- 8. A solid that forms form liquids
- 11. To combine elements to form a compound
- 13. Substances that undergo chemical change
- 18. The amount of a substance in one area