Unit 7 - Material changes

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Across
  1. 3. to describe when a substance causes burns on your skin
  2. 4. the colour shows universal indicator is added to a weak/diluted nitric acid
  3. 9. the living organism in your mouth that produces acid when they feed
  4. 11. to describe when a substance causes chemical burns on your skin
  5. 12. A substances that changes colour to show acidity or alkalinity
  6. 15. adding a lot of water to make it less concentrated
  7. 16. substances with a pH of 11-14
  8. 18. the substance that is used to treat indigestion or neutralise acid in the stomach
  9. 20. The long graduated glass tube used for neutralisation in lab
Down
  1. 1. the colour shows when universal indicator is added to a concentrated/strong Sodium hydroxide
  2. 2. the scale that used to measure how strong or weak an acid or alkali is
  3. 5. substances with a pH of 4-6
  4. 6. the common acid used in lab, also found in the stomach
  5. 7. to describe when a substance makes part of your body sore or painful, i.e cause damage to the eyes and airways
  6. 8. changing an acid or alkali into a solution at pH7
  7. 10. paper indicator that can indicate if a substance is either an acid or an alkali
  8. 11. irritation and destruction of human tissue caused by exposure to a chemical
  9. 13. pictograms used to warn about the dangerous materials
  10. 14. the colour that shows when water is added to blue litmus paper
  11. 17. The colour that shows a neutral substance when universal indicator is added
  12. 19. the colour that shows when lemon is added to blue litmus