If you were burning a candle, which of the following would be a reversible change?
  • The solid candle wax melts
  • The liquid wax in the wick burns
  • The flame produces smoke
  • All of the above
Which of the following is an example of a reversible change?
  • A puddle turns to ice on a very cold winter's day
  • Sugar is dissolved in hot water
  • An egg is fried in a hot pan
  • A bar of chocolate has been left in the sunshine and has melted
Which of the following is a sign of an irreversible change taking place?
  • A change in color
  • A sudden change in temperature
  • Vigorous bubbling
  • All of the above
Which of these mixtures is an irreversible change?
  • PVA glue mixed with Borax
  • Mixing salt and water
  • Plaster of Paris mixed with water
  • Bicarbonate of soda mixed with vinegar
Burning will produce what sort of change?
  • An irreversible change
  • A reversible change
  • Either a reversible or an irreversible change
  • Neither a reversible or irreversible change
Which of the following is an example of a reversible change?
  • Evaporation but not condensation
  • Condensation but not evaporation
  • Combustion
  • Evaporation and condensation
Heating will produce what sort of change?
  • An irreversible change
  • A reversible change
  • Either a reversible or irreversible change
  • Neither a reversible or irreversible change
Which of the following is an example of an irreversible change?
  • A log of wood has been burned on the fire
  • A fruit smoothie has been frozen to make lollies
  • A mixture of flour, water and yeast has been baked into bread
  • A bicycle left out in the rain begins to rust
What is a reversible change?
  • A material changes permanently into a new material
  • A material changes its feel or appearance, but it is still the same material
  • A material changes into a new material, but it can be changed back
  • A material stops existing
What is an irreversible change?
  • A material changes permanently into a new material
  • A material changes its feel or appearance, but it is still the same material
  • A material changes into a new material, but it can be changed back
  • A material stops existing
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