Across
- 2. a thing that is composed of two or more separate elements.
- 3. the process of increasing in physical size.
- 6. the action or process of observing something by sense organ.
- 7. a substance that increases the rate of a chemical reaction.
- 9. a substance which slows down or prevents a particular chemical reaction.
Down
- 1. type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound.
- 2. the smallest structural unit of an organism.
- 4. an individual animal, plant, or single-celled life form.
- 5. an idea or explanation for something that is based on known facts but has not yet been proved.
- 8. the basic unit of a chemical element.