MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Earn 100

Some water in a glass beaker is heated from below, as shown in the diagram.

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Name the process by which thermal energy is transferred:

Throughout the water.

Important Questions on Thermal (Heat) Energy Transfers

MEDIUM
Upper Secondary: IGCSE
IMPORTANT

Some water in a glass beaker is heated from below, as shown in the diagram.

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As thermal energy is supplied, the temperature of the water begins to rise. Although the supply of energy remains constant, eventually the temperature becomes steady at 80°C. Suggest why this happens. 

MEDIUM
Upper Secondary: IGCSE
IMPORTANT

Some water in a glass beaker is heated from below, as shown in the diagram.

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The rate of energy supply is increased. The temperature of the water begins to rise again, but eventually becomes steady at a higher temperature. This time many bubbles are seen throughout the water.

State what is now happening to the water.

MEDIUM
Upper Secondary: IGCSE
IMPORTANT

Some water in a glass beaker is heated from below, as shown in the diagram.

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The rate of energy supply is increased. The temperature of the water begins to rise again, but eventually becomes steady at a higher temperature. This time many bubbles are seen throughout the water.

What gas do the bubbles contain? Choose one from:

air, hydrogen, oxygen, steam

MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Name the process by which thermal energy is transferred through a metal rod.
EASY
Upper Secondary: IGCSE
IMPORTANT

An iron rod and a copper rod of equal length are each held by hand at one end, with the other end in the flame from a Bunsen burner, as shown in the diagram.

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The copper rod becomes too hot much sooner than the iron rod. What does this information tell you about iron and copper?

EASY
Upper Secondary: IGCSE
IMPORTANT

Gas has to be above a certain temperature before it burns.The diagram shows two similar wire gauzes, one made of iron wire and made of copper wire. Each is held over a Bunsen burner. When the gas supply is turned on and ignited the gauze, the effect is as shown in the diagram.

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How can these observations be explained?