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Physical and Chemical Changes
Chemistry · Chapter 2 · Theme 2: Physical and Chemical Changes
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Topics 6
- Changes around us: desirable and undesirable changes
- Physical changes: no new substance formed (drying clothes, melting ice, dissolving sugar)
- Chemical changes: a new substance with new properties is formed; signs of a chemical change
- Differences between physical and chemical changes; classifying everyday changes
- Changes involving a change of state: melting, boiling, sublimation (ammonium chloride, iodine)
- Changes involving energy: heat evolved or absorbed (quicklime in water, ammonium chloride in water)