Across
- 1. One or more well-established hypotheses.
- 3. measure of the quantity of matter within it.
- 7. substance displays without changing its composition.
Down
- 2. a substance that cannot be broken down into simpler substances.
- 4. are a set of standard units agreed on by the scientist through out the world.
- 5. are atoms bonded together.
- 6. what matter is composed of.