___________
Science
Separation techniques

Starter quiz

  • What process happens when a solid can be observed to 'disappear' in a liquid to make a solution?
    • boiling
    • condensing
    • melting
    • dissolving  ✓
    • evaporating
  • When a process is able to go backwards, or be "undone", it is said to be ______.
    • 'reversible' ✓
  • Match the word to the definition.
    • soluble
      ⇔
      When a solid can dissolve in a liquid ✓
    • insoluble
      ⇔
      When a solid cannot dissolve in a liquid ✓
    • solution
      ⇔
      The mixture formed when a solid dissolves in a liquid ✓
    • saturated
      ⇔
      When no more solid can dissolve ✓
  • Put the following changes of state for ice/water in order starting from the one that requires the lowest temperature to the one that requires the highest temperature.
    • 1
      ⇔
      Melting
    • 2
      ⇔
      Evaporating
    • 3
      ⇔
      Boiling
  • A volume of salt solution containing 0.5 g of salt was placed in a beaker and left for 2 weeks on the windowsill, after which only crystals of salt remained. How much salt would be present?
    • 0.0 g
    • 0.25 g
    • 0.4 g
    • 0.5 g  ✓
  • Sugar was added to water at 60℃ until no more sugar could dissolve. The solution was left to cool. What would you expect to see and why?
    • No change as the sugar would still be dissolved.
    • No change as temperature does not affect the solubility of the sugar.
    • Solid sugar would start to form as the water would evaporate.
    • Solid sugar would start to form as it is less soluble at a lower temperature.  ✓
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