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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
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
State the differences between a physical change and a chemical change.
What role does energy play in initiating a chemical change ?
Fill in the blank
Revolution of the earth around the sun is a ________ change.
Write true or false
Cutting of paper into pieces is a chemical change.
Tick (√) the correct alternative from the choice given for the following statement
Which one of the following is volatile in nature ?
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
Give the reason why the following is considered as chemical changes.
Copper carbonate on heat gives copper oxide and carbon dioxide.
Gas exists in three states as solid, liquid, and gas.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
