Page 227 - ICSE Chemistry 8

2. PHYSICAL AND CHEMICAL CHANGES

Reversible Irreversible Periodic Non-periodic
• Mel ng of ice • Ripening of mango • Phases of moon • Earthquakes
• Dissolving salt in water • Curdling of milk • Rising and se ng of sun • Landslides

Desirable Physical
• Burning of fuels • Mel ng of bu er
• Ripening of fruits • Drying of wet clothes

Changes
Undesirable Chemical
• Rus ng of iron • Burning of wood
• Soil erosion • Diges on of food

Slow Fast Natural Man-made
• Growth of plants • Burning of paper • Day and night • Cooking of food
• Tooth decay • Ligh ng of a bulb • Growth of living things • Deforesta on

Evaporation

Melting Condensation

Physical Changes

Dissolving Freezing

Boiling Sublimation

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