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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
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
State whether the following is physical or chemical changes.
respiration in living beings —
Write true or false
Deforestation is a man-made change.
Classify the following as a physical or a chemical change.
Boiling of water
Classify the following as a physical or a chemical change.
Burning of paper
Classify the following as a physical or a chemical change.
Melting of wax
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Fill in the blank with the appropriate word of the statement given below:
Germination of seeds is considered a __________ change.
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
