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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
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
Fill in the blank.
A new substance is formed in a ............... change.
Write true or false
Burning of paper and formation of curd are reversible changes.
State the various conditions that favour the process of evaporation.
Classify the following as a physical or a chemical change.
Boiling of water
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Compare the energy changes involved during a physical and a chemical change.
Select the chemical changes from the following list of changes
Breaking of glass
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
Iron pipes coated with zinc do not get rusted easily.
