reversible-or-irreversible-changes grade 2

2. Are rusting, burning and cooking
reversible or irreversible changes?
Reversible
Irreversible

3. Are melting, freezing and
evaporating irreversible or
reversible changes?
Reversible
Irreversible

4. True or False?
Most reversible changes are
physical changes.
True
False

5. Which changes are irreversible?
Frying an egg Dissolving salt in water
Freezing water
to make ice
Melting chocolate
Mixing vinegar and
bicarbonate of soda
Burning wood
Making bread into toast
Water turning into steam

6. True or False?
Beating an egg changes the consistency of the
egg irreversibly but the chemical composition
of the egg will stay the same.
True
False

7. True or False?
Changes to mixed materials can be reversed
by filtration, evaporation, sieving or pouring.
True
False

8. Which materials will dissolve
in water?
salt pepper
tea leaves
sand
sugar
Instant coffee
jelly crystals
cooking oil

9. filtration
What is the correct scientific word
for describing something that does
not dissolve in water?
insoluble
solution

10. Adding more heat
What would make a solid dissolve
quicker in water?
Making the solid into bigger pieces
Making the solid into smaller particles
Stirring it quickly or longer