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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
Fill in the blank.
Changes that occur in nature are called ........................
Give two examples of periodic changes.
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
Classify the following as a physical or a chemical change.
Melting of wax
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Periodic and non-periodic change
Select the correct answer from the choice given below to complete the sentence
The matter is added or removed during a ____________ change.
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
A physical change is generally____________.
Keeping a stone in sunlight for few hours is ______.
