Chemistry

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Across
  1. 2. Substance that has a pH less than 7
  2. 3. Substance that cannot be broken down into any simpler substance by chemical means
  3. 4. Atom or group of atoms with a negative charge or positive charge
  4. 6. Smallest particle in matter
  5. 8. Chemical reaction in which a compound or element rapidly combines with oxygen gas
Down
  1. 1. combination of pure substances
  2. 3. Subatomic particle that has a negative charge of 1-
  3. 5. Subatomic particle that is neutral
  4. 7. Anything that has mass and takes up space (has volume)
  5. 9. Substance that has a pH greater than 7