Chemistry

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Across
  1. 3. A solution with a pH value less than 7
  2. 6. The vertical columns in the periodic table are known as...
  3. 7. Halogens tend to be very ...
  4. 11. A gas that turns limewater cloudy
  5. 12. An example of an exothermic reaction
  6. 14. What substance do acids need to to give their typical acid reactions?
  7. 15. An example of an endothermic reaction
  8. 16. The number of bonds that can form
  9. 18. The change of state from a gas to a liquid
  10. 21. Gives oxygen to another substance
Down
  1. 1. The change of state from solid to gas
  2. 2. Alkalis contain... (ions)
  3. 4. A reaction with oxygen to release energy
  4. 5. The horizontal rows in the periodic table are known as...
  5. 8. The middle block of the periodic table is called the...
  6. 9. An acidity or alkalinity of a substance can be shown using an...
  7. 10. A substance that speeds up a reaction
  8. 13. Fluorine gas is an example of a ...
  9. 17. Acids contain... (ions)
  10. 19. The gain of oxygen
  11. 20. Group 1 metals get ... reactive down the group