Curriculum
Science — First Preparatory
Unit 1: Matter
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Unit 2: Forces
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Unit 3: Life
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Unit 4: Earth and Space
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Text lesson
Matter and Its Properties
Matter and Its Properties
Physical and chemical properties, and density
Physical and chemical properties, and density
| Comparison aspect | Main idea | Example | Keywords |
|---|---|---|---|
| Physical properties | can be observed or measured without changing the substance |
| observedmeasuredwithoutchanging |
| Chemical properties | appear when a reaction takes place and the substance turns into a new substance |
| appearreactiontakesplace |
| • | Density is the mass of a unit volume of a substance | — | Densitymassunitvolume |
| Density = mass ÷ volume | with units g/cm³ or kg/m³ | — | units |
- The density of water is about 1 g/cm³, which is 1000 kg/m³.
- The density of ice is about 0.92 g/cm³, so ice floats on water.
- Worked example a piece of a material has mass 500 g and volume 200 cm³. Density = 500 ÷ 200 = 2.5 g/cm³.
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