S1 to S3 Science

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Across
  1. 2. Speeds up a chemical reaction without being used up.
  2. 4. Mass divided by volume.
  3. 5. A very fast reaction.
  4. 6. Type of reaction when acid is added to alkali.
  5. 9. How much stuff something is made up of.
  6. 11. Increasing ___________, increases reaction rate.
  7. 13. Used to measure mass.
  8. 14. If an object is less dense than the liquid or gas it is in, it will ______.
  9. 16. Unit of force (what we measure it in).
  10. 17. Force caused by pull of Earth’s gravity.
  11. 19. A pull, push or twist.
  12. 20. Adding water to an acid or alkali.
  13. 21. Has a pH of less than 7.
Down
  1. 1. Keep food in a _______ to slow down reactions that make it go off.
  2. 2. Increasing ___________, increases reaction rate.
  3. 3. Unit of mass.
  4. 7. A ___________ car has little air resistance.
  5. 8. A force which opposes movement.
  6. 10. One of the things a force can change.
  7. 12. Reducing _______ size, increases reaction rate.
  8. 15. Has a pH equal to 7.
  9. 18. Has a pH greater than 7.