When a woolen yarn is knitted to get a sweater, the change can be classified as _______ .

______ of the following are endothermic changes.

The chemical change is _______.

________is an example of a periodic change.

_________ is not a chemical change.

State two examples of periodic changes.

Mention any two exothermic reactions.

What type of change is artificial ripening of fruit?

What type of change is colouring of a paper?

Growing of nails is a periodic change. Why?

Classify the following changes as physical and chemical changes
A rough piece of wood is sanded and polished resulting in change in texture, Rusting of a iron nail, Painting the grill, Bending a paper clip, Pounding silver into thin plate, Rolling the chappathi dough into thin wire, Occurrence of day and night, eruption of volcano, burning of matchstick, dosa from the batter, blinking of eyelids, occurrence of a thunderstorm, rotation of the earth, formation of eclipses.

Distinguish physical and chemical changes.

Can you suggest a method to collect water from sea water?

Is solar eclipse a periodic change? Give your reason.

What is the difference between dissolution of sugar and burning of sugar?

Explain the following statement: Digestion is a chemical change.

Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?

A very hot glass on putting in cold water cracks. What does this change indicate?

Boiling of water is a physical change; but boiling of egg is a chemical change. Why?