Physical and chemical change

What is a change?

• Physical propery

• Chemical property

• None of these

• An alteration

Ram has taken a apple and cut it to slice.Then he kept it uncovered for sometime.What did he observe after sometime?

• The apple turned blue and it is a chemical change.

• The apple turned white due to physical change.

• The apple turns yellowish due to chemical change.

• The apple remains the same.

Which of the following is a chemical change?

• Melting of ice

• Cutting of paper

• Digestion of food

• External respiration

Which of the following is a irreversible change?

• Cutting of lemon

• Melting of icecream

• Streching of a rubberband

• Evaporation of water

Burning of a candle is a __.

• Chemical change

• Physical change

Ripening of mango is a chemical and reversible change.

• True

• False

Why can we compress a sponge?

• Because sponge is a semi-solid

• Sponge cannot be compressed

• We actually compress the air inside the tiny holes of a sponge

• None of these

Bursting of crackers is a

• Chemical and reversible change

• Physical and irreversible change

• Undesirable change

• Chemical and irreversible change

Breaking of glass is a

• Chemical change

• Physical change

Expansion on heating and contraction on cooling of metals is a

• Chemical Change

• Physical Change

• Irreversible change

• Reversible change