Reversible And Irreversible Changes Fact Sheet
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1
2Any reaction, such as burning,
Physical Changes
When chocolate is melted it
that causes new substances to
can solidify again. The
be formed is called a
change is reversible.
CHEMICAL CHANGE. These
Cooking eggs, by frying, boiling,
changes are irreversible.
scrambling, poaching etc., is
solid
liquid
gas
always an irreversible change.
When oil, vinegar and egg
Changing state from solid to liquid
fuel
oxygen
flame
yolks are mixed together ,
to gas and back again is a
they make a precipitate
reversible change.
called mayonnaise. This
Heating is the process of
change is irreversible.
heat
increasing the temperature.
ash
smoke
Dissolving sugar in water is
Cooling is the opposite process where
a reversible change. When
temperature is decreased. We use
the water is evaporated it
a thermometer to measure
leaves the sugar behind.
temperature.
When vitamin tablets
A wind turbine helps to
Coal, gas and oil are all fossil
effervesce (fizz) a gas is
generate electricity from
fuels. They non-renewable
produced. This is an
renewable sources.
energy sources.
irreversible change.
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