Changes around us -Grade-6

A chemical change is_______

• Permanent

• Temporary

• None of the avove

• Both of these

Melting of ice is an example of_______

• Chemical change

• Physical change

Rusting of iron is an ________ change.

• Physical change

• Chemical change

• Desirable change

• Reversible change

During condensation and evaporation of water, the ________ of water changes.

• Appearance

• State

• Movement

Changes that lead to the formation of new substances are called_________.

• Physical change

• Chemical change

Which of the following changes cannot be reversed?

• Milk to paneer

• Cold milk to hot milk

• Yarn to knitted sweater

• Wet clothes to dry clothes

Which of the following can be reversed?

• Raw egg to boiled egg

• Wet clothes to dry clothes

• Bud of a flower

• Cow dung to bio-gas

A small quantity of curd is added to warm milk. The milk is stirred and is set aside undisturbed for a few hours at a warm place. In a few hours, the milk changes into curd. Is this change reversible?

• No, its Irreversible.

• Yes, its reversible.

• I don't know

• The question is inappropriate.

A physical change...

• changes the physical properties of an object, but does not create a new substance.

• creates a new substance and cannot be undone.

Is this an example of a physical or chemical change?

• physical

• chemical