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6. The solubility of gases _________ as temperature increases

  • Stays the same
  • Decreases
  • Increases

7. The solubility of gases __________ as temperature decreases

  • Increases
  • Decreases
  • Stays the same

8. The solubility of gases ____________ as pressure increases

  • Stays the same
  • Increases
  • Decreases

9. The solubility of gases ____________ as pressure decreases

  • Decreases
  • Increases
  • Stays the same

10. Which water, hard or soft, can limescale form in?

  • Hard
  • Soft

11. Which water, hard or soft, can scum form in?

  • Soft
  • Hard

12. Calcium is good for our health, why?

  • Better sense of smells
  • Healthier heart
  • Stronger immune system
  • Stronger teeth and bones
  • Healthy vision

13. Scum is formed when...

  • Soap enters water
  • Magnesium enters water
  • Chlorine enters water
  • Water is purified

14. Washing soda can remove hardness from water, what does it contain?

  • Sodium carbonate
  • Magnesium chloride
  • Chlorine

15. Microorganisms can be killed by boiling water

  • True
  • False

16. What else is added to water to kill microorganisms?

  • Chlorine
  • Calcium
  • mercury
  • Magnesium
  • Sodium

17. Why should drinking water contain as little harmful substances as possible?

  • So it's safe to drink
  • So it doesn't dissolve
  • So it doesn't evapourate

18. What PH must drinking water be?

  • Alkaline
  • Neutral
  • Acidic

19. What is de-ionisation?

  • The romoval of ions from water
  • Chaning the PH of water
  • The removal of microorganisms from water
  • The boiling of water