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  • Name the fuel that the human body 'burns'
    The human body burns food
  • Is it useful to sieve a solution?
    No, this is pointless/not useful
  • What happens to water vapour when it cools?
    It condenses into liquid
  • Why do we sieve flour before we bake?
    To separate lumps from the flour
  • Is melting reversible or irreversible?
    Melting is reversible
  • Name 3 different fuels.
    Gas, oil and wood are fuels.
  • What is a particle?
    It's a very small piece
  • What's another word for 'sieving'?
    Sifting
  • Why do puddles look like they disappeared?
    Because the water evaporated
  • What two processes do we need to separate a mixture of sand and salt?
    We need filtering and evaporation.
  • What is 'recycle'?
    Use again
  • Do things disappear when they dissolve?
    No, they look like they disappear
  • If I want to make a filter, should I use something permeable or impermeable?
    Something permeable
  • Is sugar soluble?
    Yes, sugar is soluble
  • Is soil soluble or insoluble?
    Soil is insoluble (in water)
  • What do we call the process of separating solids from liquids?
    This is filtering
  • What are filter beds used for?
    They are used for cleaning water.
  • What happens to salt in water?
    Salt dissolves in water
  • What is a sieve with big holes (that we can use to separate peas from water)?
    This is a colander
  • What is 'separate' the opposite of?
    It's the opposite of 'mix' or 'combine'
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