The crossword

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Across
  1. 2. The amount of one material in a certain volume of another material
  2. 5. change- Changes the physical appearance but not the actually substance
  3. 6. Property- A characteristic of a substance that can be observed
  4. 8. System- Matter can enter or escape the system
  5. 10. System- No matter is allowed to enter or leave
  6. 12. Property- The ability to change into different substances
  7. 15. Anything that has mass or occupies space.
  8. 17. reaction- A reaction that absorbs energy in the form of heat.
  9. 19. Two or more substances combine to form a new substance.
  10. 21. A rapid reaction between oxygen and fuel that results in a fire.
  11. 22. energy- The minimum amount of energy needed.
  12. 23. Releases energy when it burns.
Down
  1. 1. How many atoms or molecules are represented in a reaction
  2. 3. When one element replaces another.
  3. 4. reaction- Substances undergo chemical changes that result in a new substance
  4. 6. A solid that forms from a solution during a chemical reaction
  5. 7. Equation- A short easy was to show a chemical reaction using symbols
  6. 9. of mass- Matter isn’t created or destroyed during a chemical reaction
  7. 11. A chemical that breaks down into simpler substances.
  8. 13. A material that increases the rate of reaction
  9. 14. The studies of properties of matter and how matter changes.
  10. 16. reaction- A reaction that releases energy in the form of heat.
  11. 18. A substance that enters into a chemical reaction
  12. 20. The result of a chemical reaction