S1 to S3 Science

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