Chemistry

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Across
  1. 1. Matter cannot be created or destroyed
  2. 5. Bonds formed when atoms share electrons
  3. 8. A short way to show what elements are in a compound and how many of each there are
  4. 10. Substances that's slow down or stop chemical reactions
  5. 12. Things that come from nature
  6. 13. Substances that make chemical reactions happen faster
  7. 14. Pure substances made up of only one type of atom
  8. 16. The new substances form the chemical reaction
  9. 18. 2 or more substances that join together
  10. 19. A chemical reaction that absorbs heat energy
Down
  1. 2. Made by people
  2. 3. A chemical reaction that releases heat energy
  3. 4. Small numbers written to show how many atoms of each element are in a compound
  4. 6. Things that make up everything around us
  5. 7. When substances change into different ones
  6. 9. Numbers written in front of chemical formulas to balance equations
  7. 11. Bonds formed by the attraction between positively and negatively charged ions
  8. 15. The substances you start within a chemical reaction
  9. 17. Heat Energy