Across
- 5. the total energy of a system
- 7. part of the universe we wish to study
- 8. energy changes in chemical reactions
- 9. divides a system from its surroundings
Down
- 1. determination of the heat
- 2. energy is absorbed
- 3. science of measuring the quantities of heat
- 4. energy is released
- 6. the strength required for physical activity
- 7. universe other than the system being studied