Across
- 2. When two or more elements or compounds combine to make more complex substances
- 4. is a characteristic of a substance that can be observed without changing the substance into another substance
- 6. a reaction in which energy is absorbed.
- 7. where matter can enter from or escape to the surroundings.
- 9. is the amount of a substance in a given volume.
- 10. a change in matter that produces one or more new substances
- 12. is the minimum amount of energy needed to start a chemical reaction.
- 13. a process called ____ breaks down compounds into simpler products.
Down
- 1. A characteristic of a substance that describes its ability to change into other substances
- 3. any change that alters the form or appearance of a substance but that does not make the substance into another substance
- 5. where matter is not allowed to enter or leave.
- 8. a short easy way to show a chemical reaction using symbols instead of words
- 11. A solid that forms from solution during a chemical reaction