Topic: Reversible and irreversible changes
1) What do reversible and irreversible changes mean?
2) Examples of reversible and irreversible changes.
3) Why high fever is so dangerous for our organism?
Answers for the exercise in Workbook (Page 31):
Bread toasting - irreversible
Water freezing on the ground - reversible, we can melt ice
Spoonful of sugar dissolving - reversible, water will evaporate from the solution
Candle burning - irreversible
Boiling an egg - irreversible
Bar of chocolate melting - reversible, we can put melterd chocolate bar to the fridge
Firing a clay pot in a hot oven - irreversible
Water vapour from the air condensing on a cold-drinks can - irreversible
Car rusting - irreversible
1) What do reversible and irreversible changes mean?
2) Examples of reversible and irreversible changes.
3) Why high fever is so dangerous for our organism?
Answers for the exercise in Workbook (Page 31):
Bread toasting - irreversible
Water freezing on the ground - reversible, we can melt ice
Spoonful of sugar dissolving - reversible, water will evaporate from the solution
Candle burning - irreversible
Boiling an egg - irreversible
Bar of chocolate melting - reversible, we can put melterd chocolate bar to the fridge
Firing a clay pot in a hot oven - irreversible
Water vapour from the air condensing on a cold-drinks can - irreversible
Car rusting - irreversible
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