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प्रश्न
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
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उत्तर
We observe that hydrogen bums at the mouth of test tube with blue flame and pop sound is heard. It is chemical change.
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संबंधित प्रश्न
Explain the following giving an example.
Pure substance
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
Is burning a physical change or a chemical change? Why?
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Classify the following as physical or chemical change :
Growth of a plant
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Give the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
When solute is dissolved in a solvent it forms a solution.
