Chemistry Crossword : Sarah T and Hannah

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Across
  1. 1. substance elements or compounds
  2. 3. what happens when two substances interact
  3. 4. a thing that is composed of two or more separate elements
  4. 6. two substances combined
  5. 7. each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter
  6. 10. an atom with a negative charge
  7. 12. Gases elements on the periodic table that we're long believed to be unreactive to anything
  8. 15. absorbs heat
  9. 18. Table the most common way to organise learn the elements
  10. 19. Democritus’ version of the atom
Down
  1. 1. Atom with a positive charge
  2. 2. the most reactive nonmetal elements on the periodic table
  3. 5. physical substance in general (what everything is made of)
  4. 6. a group of atoms bonded together
  5. 8. releases heat
  6. 9. Metals the most reactive elements on the periodic table
  7. 11. the basic unit of a chemical element.
  8. 13. not a nonmetal, but not a metal
  9. 14. characteristics of a substance
  10. 16. Mass how many atoms are in an element
  11. 17. a compound or substance that has been purified or prepared, especially artificially