Across
- 2. The smallest part of an element that retains its properties
- 3. The part of a cell where respiration occurs
- 6. The unit of electrical current
- 7. The arrangement of elements based on atomic number
- 8. Gas produced during photosynthesis
- 9. The speed at which work is done
- 10. The force that pulls objects toward Earth
- 12. Substance made from two or more elements chemically combined
Down
- 1. The process by which green plants make their own food
- 4. Units that carry inherited characteristics
- 5. A chemical reaction that releases heat
- 6. Rate of change of velocity
- 11. A non-renewable fossil fuel energy source