Physical vs Chemical Changes MCQs Quiz | Class 9
Test your understanding of Unit I: Matter – Its Nature and Behaviour for Class IX Science (Code 086). This quiz covers the differences between physical and chemical changes and identification from examples. Complete the 10 MCQs below, view your score, and download the solution PDF for revision.
Understanding Physical and Chemical Changes
In our surroundings, matter undergoes various changes. These changes are broadly classified into two categories: Physical Changes and Chemical Changes. Understanding the distinction between them is fundamental to Chemistry.
1. Physical Changes
A physical change is a process in which a substance changes its physical appearance but not its basic chemical composition. No new substance is formed.
- Nature: Usually reversible (though not always).
- Properties: Change in state, size, shape, or color.
- Examples: Melting of ice, tearing of paper, dissolving salt in water, breaking a glass tumbler.
2. Chemical Changes
A chemical change is a process where one or more substances are altered into one or more new and different substances. This involves a chemical reaction.
- Nature: Usually irreversible (permanent).
- Properties: Formation of new products with entirely different properties, evolution of gas, change in temperature, or change in color.
- Examples: Rusting of iron, burning of wood, curdling of milk, digestion of food.
Comparison Table
| Feature | Physical Change | Chemical Change |
|---|---|---|
| New Substance | No new substance formed | New substance formed |
| Reversibility | Generally reversible | Generally irreversible |
| Chemical Properties | Remain same | Change completely |
| Energy Change | Small amount of heat/light | Large amount of heat/light absorbed or evolved |
Common Examples for Class 9
- Burning of a Candle: This is a unique case involving both changes. Melting wax is physical, while burning wax (combustion) is chemical.
- Cutting vs Burning Wood: Cutting wood into small pieces is physical (only size changes). Burning wood to ash is chemical.
- Sublimation: Heating camphor or ammonium chloride is a physical change as the substance changes state directly from solid to gas without changing composition.
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