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प्रश्न
Higher order Thinking question
Boiling of water is a physical change; but boiling of egg is a chemical change. Why?
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उत्तर
- Boiling of water is a physical change:
On boiling, water is converted into steam. If we cover the beaker with a lid, steam condenses back to water. So, boiling, of water is a physical change since only the physical state of water changes.
- Boiling of egg is chemical change:
When egg is boiled, chemical nature of the egg changes. The properties of a boiled egg are totally different from the raw egg. Hence, boiling of an egg is a chemical change.
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संबंधित प्रश्न
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
Photosynthesis cannot take place at night.
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Fill in the blank
Changes that occur in nature are called ______
What is a chemical change ? Give two examples of chemical changes.
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
Explain the characteristics of physical change with examples.
