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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:
Making a fruit salad with raw fruits
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
Write true or false for the statement.
Burning of paper and formation of curd are reversible changes
Chemical changes are accompanied by changes in energy.
Match the columns.
| Column A | Column B |
| 1. a change which cannot be easily reversed | a. man-made change |
| 2 a change that repeats itself at regular intervals | b. chemical chang |
| 3. a change that is made by humans | c. physical change |
| 4. a change in which the original substance cannot be obtained | d. periodic change |
| 5. a change where no new substance is formed | e. irreversible change |
| f . slow change |
Sublimation is classified as a physical change. Why ?
Classify the following as physical or chemical change :
Growth of a plant
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
State what is meant by the term – interconversion of matter. Is interconversion of matter a physical change or a chemical change.
The change of state of a substance from solid to liquid and liquid to gas is ______.
