Reversible and Irreversible Changes week 5

Which of these changes is irreversible?

• Burning wood

• Freezing water
• Dissolving sugar in water
• Melting ice

Which of these changes are reversible?

• sand mixed in water

• baking a potato

• dissolving an Aspro-Clear

• frying an egg

Which of these changes are reversible?

• burning wood

• rice mixed in sand

• tearing paper

• baking a cake

Which of these changes are reversible?

• lighting a match

• cooking a steak

• blowing up a balloon

• having a birthday

Which of these changes are reversible?

• Dissolving sugar in water
• Rusting iron
• Melting ice

• Burning wood

Which of these changes are irreversible?

• Dissolving salt in water

• Melting ice
• rusting iron

• Inflating a balloon

What kind of reversible change is it when water is heated?

• Evaporation
• Freezing
• Condensation
• Sublimation

What kind of change is made when paper is folded in origami?

• A chemical change

• A biological change

• An irreversible change

• A physical change.

What kind of change is it called as we grow older?

• reversible

• irreversible

• chemical

• mechanical

What kind of change is it when you melt butter or chocolate?

• It is a physical change.
• It is a mechanical change.

• It is a biological change.
• It is a chemical change.