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Science topics ages 9 - 10
Gases around us
Curriculum relevance | Online lesson plan
Offline lesson plan | Worksheet |Activity |
Quiz
Online lesson plan
Objectives
Know that gases are formed when liquids evaporate and that when a gas is
cooled, it condenses to form a liquid
Understand that gases move and flow more easily than liquids, and in all
directions
Understand that gases differ from solids and liquids in that they do not
maintain their shape and volume, but spread out to fill the space they are
in
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National Curriculum
England: Key Stage 2, Science, Sc3 1e, 2b, 2d
Wales: Key Stage 2, Materials and their properties 1.5, 2.2, 2.6
Northern Ireland: Key Stage 2, Materials, Properties d; Change, c
Scotland: 5-14 Guidelines, Science, Materials from Earth, Level C; Changing
materials, Level B
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Resources required
Online activity from Science Clips website: Gases around us
Large labels of the words ‘liquid’, ‘gas’,
‘cool’, ‘heat’, ‘evaporate’,
‘condense’
Electric kettle of water
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Teaching activities
Introduction
Display the labels. What happens when you heat a liquid? Demonstrate by
boiling water in the kettle. Ask children to explain what they see, using the
displayed words.
Where does the gas go? Boil the kettle again, but this time near a cold
window. Ask the children to first feel the window (it is cold). Tell the
children to watch the cold window to see what happens when the steam touches it
and cools down (it condenses and becomes a liquid again).
Activities
What shape does a gas have? How does it move? Write these questions on the
board. Tell children that, as gases are often invisible, these questions are
difficult to answer. Tell children they are going to work in the virtual
laboratory to find out the answers. Open the online activity on the interactive
whiteboard and explain to children how to use the Heat and Cool controls.
Arrange the children in pairs or groups, with a computer for each group. Ask
children to work through the online activity, following the tasks written (and
spoken) at the top of the screen.
Plenary
Find answers to the questions on the board. What happened when the liquid was
heated? Where did the gas go? What happened when you then removed the lids of
the beakers? Where did the gas go then? Elicit ideas that gases spread out when
they move and do not keep their volume, and that they take the shape of the
whole container be it the room or the two beakers. When the lid was on the
beakers, why did the liquid form in both beakers when it was cooled?
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Extension
Ask children to click the Sorter button to sort things according to whether
they are solids, liquids, or gases. They could also try the online quiz.
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Suggested homework
Draw a cartoon strip of someone having a bath or shower. Can they explain
scientifically what happens to the water?
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