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प्रश्न
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
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उत्तर
Iron III oxide [Fe2O3x H20]
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Melting of butter in a pan
State the differences between a physical change and a chemical change.
Solve this crossword by using the clues that follow.
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Tick the most appropriate answer.
Rising and setting of the sun at a given place is a
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
Which of the following are physical changes and which are chemical changes ?
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
