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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
Fill in the blank.
A new substance is formed in a ............... change.
Write true or false
Cutting of paper into pieces is a chemical change.
Write true or false
Burning of sugar is a temporary change.
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
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Is melting of ice a reversible change?
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Name the following.
The gaseous product of the chemical change which takes place during respiration in living organisms.
