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प्रश्न
Give two examples for the following case:
Chemical changes
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उत्तर
- Burning of paper
- Curdling of milk
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संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron pipes coated with zinc do not get rusted easily.
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron and rust are the same substances.
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
What do you observe when :
an iron nail is kept in tap water for few days
Give an example of a reaction where the following are involved
Pressure
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Zinc carbonate.
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Are these changes chemical in nature?
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
