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melting
Melting changes solid to liquid.
Class 4 · Bangla Version · General science
Materials and changes of state
Explore materials and changes of state with an example and your own answers.
Original Kidemy foundation practice · Read the example, write your answers, then check. This starter is shared across class versions; it is not a complete board-specific lesson or course.
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Learn the idea
Heating or cooling can change a substance's state. Melting changes solid to liquid; freezing changes liquid to solid.
Worked example
Ice melts into water when warmed. Water freezes into ice when cooled enough. Observe with supervision rather than handling very hot materials.
- Read the example and explain which rule or evidence it uses.
- Try each task yourself, then compare the answer and its reason.
Your written practice
Show your working on paper and enter your answer here. If it does not match, compare the model and try again.
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freezing
Freezing changes liquid to solid.
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evaporation
Evaporation changes liquid to vapour.
Take it further
Apply the idea in a new situation and explain your method. Open writing needs a guardian or teacher to review it.
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freezing
Cooling can change liquid water into ice.
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melting
Heating ice can cause melting.
Write in your own words. A guardian or teacher should review this response.
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The same substance changes from solid to liquid; the liquid water is still present.
Describe a state change rather than disappearance or a new substance.
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