Curriculum
Course: Science — Second Preparatory
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Curriculum

Science — Second Preparatory

Unit 1: Matter and Energy

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Unit 2: Matter and Chemical Reactions

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Unit 3: Energy Flow in Photosynthesis and Respiration

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Unit 4: Geological Processes

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Text lesson

States of Matter

Science — Second Preparatory

States of Matter

Applications and examples

Applications and examples

Comparison aspectMain ideaKeywords
Experiment 1: ice and water.Place a piece of ice in a glass of water at room temperature. Ice is a solid with a fixed shape. When it melts it becomes a liquid that takes the shape of the glass. This shows that the same substance (water) changed its physical state without changing its chemical compositionPlacepieceglassroom
Experiment 2: diffusion in air.Put a few drops of perfume in one corner of a room. After a few minutes you can smell it in the opposite corner. The reason is that the perfume vapour particles spread between the air particles through their random motiondropsperfumecornerroom
Experiment 3: compression.
  • Fill a syringe with air
  • close its nozzle with your finger and push the plunger. The air volume decreases easily. Repeat the test with water and the plunger becomes very hard to push
  • and the water volume hardly changes. This shows that gases can be compressed and liquids cannot be compressed in a noticeable way
Fillsyringeclosenozzle
Extra example→A car tyre is filled with compressed air. This is why it supports the weight of the car and keeps its shape.
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