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प्रश्न
Define the following term:
Chemical change
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उत्तर
A chemical change is a permanent change in which the chemical composition of a substance is changed and one or more new substances with different chemical compositions and different properties are formed.
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संबंधित प्रश्न
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
What do you observe when Cobalt chloride paper is introduced in water vapour.
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
What do you observe when CO2 is passed through lime water first and then a little in excess.
Write your observation and a balanced equation in the case of the following substances being heated.
Zinc carbonate.
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
______ change results in the change of the substance.
Burning of paper is the best example of ______ change.
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
