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