Reversible and Irreversible Changes Quiz

What defines a reversible change?

• Creates a new material

• Cannot be undone

• Can be reversed to the original state

• Only occurs in solids

Which is an example of a reversible change?

• Frying an egg

• Melting ice

• Burning paper

• Cooking ingredients into a cake

Dissolving salt in water is reversible because:

• It forms a new material

• Salt can be recovered by evaporation

• It creates a gas

• It is irreversible

What happens in an irreversible change?

• Materials return to their original state

• A new material is formed

• Only the shape changes

• It can always be undone

Which is an irreversible change?

• Stretching a rubber band

• Burning wood

• Freezing juice

• Dissolving sugar

Mixing bicarbonate of soda and vinegar causes:

• A reversible state change

• An irreversible reaction producing CO₂

• Dissolution without residue

• Magnetism

Plastic milk (milk + vinegar) is irreversible because:

• It can be filtered

• Curds cannot turn back into milk

• It evaporates

• It dissolves

Cola and mints create an irreversible change due to:

• Reversible gas production

• Inability to restore the original cola

• Filtration recovery

• Sieving separation

Which separation method recovers solute from a solution?

• Sieving

• Magnetism

• Evaporation

• Filtration

Rolling modeling dough is reversible because:

• It creates a new substance

• It can be reshaped

• It involves heat

• It is permanent