Intro to Chemistry

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Across
  1. 2. substances undergo a chemical change
  2. 5. a chemical substance that cannot be broken down further
  3. 6. two or more atoms connected by chemical bonds
  4. 7. substance with loose free particles
  5. 9. a mixture that appears uniform throughout
  6. 10. the end of a chemical reaction
  7. 13. substance composed of identical molecules
  8. 14. two or more substances that are not chemically combined
  9. 16. positive subatomic particle in the nucleus
  10. 17. substance with tightly packed particles
Down
  1. 1. the start of a chemical reaction
  2. 3. negative subatomic particle surrounding the nucleus
  3. 4. neutral subatomic particle in the nucleus
  4. 8. smallest unit of an element
  5. 9. a mixture that has distinguishable parts
  6. 11. substance that can flow
  7. 12. anything that takes up space
  8. 15. mass per unit volume