Across
- 2. what is being studied/measured
- 7. the law that states atoms cannot be created or destroyed, only rearranged
- 9. a particle of matter/the basic unit of a chemical element
- 10. substances/elements before an equation
Down
- 1. what does the arrow in an equation mean
- 3. anything that has mass or takes up space
- 4. the same number of each type of atom on both sides of the equation
- 5. the mass increases when atoms ______ the system
- 6. substances/elements after an equation
- 8. the mass decreases when atoms ____ the system