Changes in Matter

Which of the following is NOT a physical change?

• melting of ice

• rotting of fruits

• breaking of glass

• tearing of paper

which of the following example shows a chemical change?

• molding of clay

• folding of paper

• burning of wood

• bending of paper clip

What happens to chopped potatoes when exposed to oxygen?

• It turns white

• It turns brown

• It turns red

• Nothing happens

Which of the following will rust when it is wet?

• a ball

• a nail

• a paper

• a pencil

Which part of the air is needed to sustain a fire?

• nitrogen

• oxygen

• hydrogen

• carbon dioxide

What causes rust to form?

• reaction of iron to heat

• reaction of iron to force

• reaction of iron to oxygen

• reaction of iron to cold weather

Which of the following is NOT an example of combustion?

• fireworks

• lighting a match

• rusting of metal

• burning wood

What chemical reaction below produces heat and light?

• rusting

• digestion

• combustion

• respiration

What evidence shows a chemical change?

• formation of smoke

• formation of precipitate

• formation of new substance

• all of the above

What will happen if water will be exposed to a very low temperature?

• It will melt

• It will freeze

• It will evaporate

• Nothing will change