Across
- 1. a reaction where the energy is absorbed
- 3. a system in which matter can enter from or escape into its surroundings
- 6. a system in which no matter is allowed to enter or leave
- 7. the substances that undergo chemical changes
Down
- 1. a reaction where the energy is released
- 2. a change in matter that produces one or more substances
- 4. a change that alters the form or appearance of a substance without changing it into a different substance
- 5. the substances formed through a chemical reaction