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Science topics ages 10 - 11
Reversible and irreversible changes
Curriculum relevance |
Online lesson plan
Offline lesson plan |
Worksheet |
Activity |
Quiz
Online lesson plan
Objectives
Understand some solids dissolve and some do not
Know that some changes are reversible and some are irreversible
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National Curriculum
England: Key Stage 2, Sc1 2l; Sc3 2a, 2d
Wales: Key Stage 2, Materials and their properties, 2.2, 2.5
Northern Ireland: Key Stage 2, Materials, Change, a, e
Scotland: 5-14 Guidelines, Science, Changing materials, Level C
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Resources required
Online activity from Science Clips website: Reversible and irreversible
changes
Copies of the Reversible and irreversible changes worksheet printed from the
Science Clips website
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Teaching activities
Introduction
Ask children to explain what they know about dissolving. Use this as a basis
to guide discussion of solutions and how to separate them. Tell them they are
going to investigate some solids to see which dissolve in water and which do
not. Bring up the online activity on an interactive whiteboard. Ask children to
predict which of the solids in the menu (salt, flour, coffee, sand) will
dissolve in the water to form a solution, and which will not dissolve. Write
the predictions on the board.
Activities
Within the online activity, show children how to add a substance to the water
by clicking and dragging a solid from the menu into the beaker. Click on the
Reversing button. Show children how they can drag substances from the menu onto
the screen and try to reverse changes that have taken place.
Divide the children into groups with a computer for each group. Let the groups
work through the Dissolving and Reversing screens, following the tasks written
(and read aloud) at the top of the screen.
Plenary
Which solids dissolved and which did not? Compare their observations to their
predictions made earlier. How can the change brought about by mixing a soluble
or insoluble substance with water be reversed (by filtering or by evaporating)?
In the reversing part of the activity, which changes were reversible and which
were irreversible? Make a list. Tell them that irreversible changes result in
the formation of new materials, which may be desirable (e.g. a baked cake) or
undesirable (e.g. a rusty bike).
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Extension
Hand out copies of the worksheet. Explain to children that they must write
which of the changes shown are reversible and which are irreversible. Allow
children to complete the worksheet independently.
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Suggested homework
Ask children to make a list of reversible and irreversible changes they
observe in their home or garden.
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