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प्रश्न
Fill in the blanks in the following statements using the words given in the box.
| rusted, colourful, substance, chemical, physical, reversible, iron oxide, object |
- Making sugar solution is a ______ change.
- A physical change is generally ______.
- Grinding of wheat grain changes its size. It is a ______ change.
- Iron benches kept in lawns and gardens get ______. It is a ______ change because a new ______ is formed.
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उत्तर
- Making sugar solution is a physical change.
- A physical change is generally reversible.
- Grinding of wheat grain changes its size. It is a physical change.
- Iron benches kept in lawns and gardens get rusted. It is a chemical change because a new substance is formed.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Rusting of almirah
State the differences between a physical change and a chemical change.
Define a chemical change. Give two examples of the above changes.
Differentiate between a physical change and a chemical change with reference to – Formation of products.
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Is a change of state of matter – a physical or a chemical change. Give reasons.
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
Cutting a log of wood into pieces is a chemical change.
