BBC - KS2 ReviseWise - Materials

Materials: Changing materials

Some children measured the temperature of water as it was cooled down. Look at this graph and use it to answer the questions 1 - 5.

What happened to the water temperature during the first ten minutes of the experiment?

What was the original temperature of the water?

What was the temperature of the water after 9 minutes?

What was the lowest temperature of the water?

What happened to the water temperature between 12 and 15 minutes after the experiment had begun?

it went down

it went up

it stayed the same

The table shows the results of an investigation. Small pots of material were placed into washing up bowls filled with hot water. Then the small pots were put into washing up bowls filled with ice. Then a teacher heated each small pot in a candle flame.
Use the information to answer questions 6-10.

Material	Hand hot water	Ice cubes	Candle flame
Ice	Melted	Froze again	Melted quickly
Chocolate	Melted	Turned back to a solid	Melted then burnt
Sand	Did not change	Did not change	Did not change
Candle wax	Melted	Turned back into a solid	Melted then burnt
Sugar	Did not change	Did not change	Melted then burnt

Which substance did not change at all?

What kind of change does the ice show?

reversible

irreversible

no change

Some of the materials burnt in the candle flame. What is this kind of change called?

reversible

irreversible

no change

Which material only changed when it was heated in the candle flame?

When a candle is lit the wax melts first and then it burns. This is a reversible reaction followed by an irreversible reaction. Candle wax also melts in hand hot water. Which other substance did the same as the candle?

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