chemistry class

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Across
  1. 2. The joining of atoms.
  2. 4. A particle with a positive charge.
  3. 5. A measure of how acidic or alkaline something is.
  4. 7. Substance with a pH below 7.
  5. 9. Substance with a pH above 7.
  6. 12. A substance that dissolves in a liquid.
  7. 13. The liquid that dissolves a solute.
  8. 15. Table that organises all known elements.
  9. 17. A change that produces new substances.
  10. 18. Particle with no charge.
  11. 20. The number of protons in an atom.
Down
  1. 1. A substance made from two or more elements chemically joined.
  2. 3. A vertical column in the periodic table.
  3. 6. A substance that speeds up a reaction.
  4. 8. The process of burning.
  5. 10. A mixture where a solute dissolves in a solvent.
  6. 11. Negatively charged particle in an atom.
  7. 14. The smallest particle of an element.
  8. 16. A reaction that releases heat.
  9. 19. The centre of an atom.