Across
- 4. Two or more atoms held together by chemical bonds.
- 5. Uses chemical formulas to model what happens in a chemical reaction.
- 8. Substance present after the chemical reaction.
- 10. Repeated units that give crystal structure.
- 12. is a number placed in front of a chemical formula to show how many molecules of the substance are represented in the chemical equation.
- 13. substance are those that can be observed or measured without changing the substance’s identity.
Down
- 1. Is the process in which atoms are rearranged to produce different substances.
- 2. A number below and to the right of the symbol, shows how many atoms of that element there are.
- 3. states that matter cannot be created or destroyed in ordinary chemical or physical changes.
- 6. A type of matter that can't be separated physically such as water.
- 7. can be determined by observing whether or not a substance can change into another substance under a given set of conditions.
- 9. A combination of chemical symbols and numbers that is used to represent a single unit of a substance
- 11. Substance present before the chemical reaction occurs.