Changing Materials: Reversible and Irreversible ChangesOnline version Test what you know about reversible and irreversible changes with this awesome science game! by Skoolmaths 1 What is an irreversible change? a A material changes permanently into a new material b A material changes its feel or appearance, but it is still the same material c A material changes into a new material, but it can be changed back d A material stops existing 2 Frying eggs will produce what sort of change? a An irreversible change b A reversible change c Either a reversible or irreversible change d Neither a reversible or irreversible change 3 Which of these mixtures is not an irreversible change? a Bicarbonate of soda mixed with vinegar b Plaster of Paris mixed with water c Mixing salt and water d PVA glue mixed with Borax 4 If you were burning a candle, which of the following would be a reversible change? a The solid candle wax melts b The liquid wax in the wick burns c The flame produces smoke d All correct 5 What is a reversible change? a A material changes permanently into a new material b A material changes its feel or appearance, but it is still the same material c A material changes into a new material, but it can be changed back d A material stops existing 6 Burning will produce what sort of change? a An irreversible change b A reversible change c Either a reversible or an irreversible change d Neither a reversible or irreversible change 7 Which of the following is a sign of an irreversible change taking place? a A change in colour b A sudden change in temperature c Vigorous bubbling d All of the above 8 Which of the following is not an example of an irreversible change? a A log of wood has been burned on the fire b A fruit smoothie has been frozen to make lollies c A mixture of flour, water and yeast has been baked into bread d A bicycle left out in the rain begins to rust 9 Which of the following is not an example of a reversible change? a A puddle turns to ice on a very cold winter's day b Sugar is dissolved in hot water c An egg is fried in a hot pan d A bar of chocolate has been left in the sunshine and has melted 10 Which of the following is an example of a reversible change? a Evaporation but not condensation b Condensation but not evaporation c Combustion d Evaporation and condensation Feedback 2 The correct answer is Either a reversible or irreversible change Gentle heating can melt a substance - this would be a reversible change. Heating can also cook something, which would be an irreversible change 5 The correct answer is A material changes its feel or appearance, but it is still the same material A material changes its feel or appearance, but it's still the same material and the change can be reversed (that is, changed back) 10 The correct answer is Evaporation and condensation These reversible changes are a vital part of the water cycle
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