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Define the following term: Chemical change - Chemistry

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प्रश्न

Define the following term:

Chemical change

परिभाषा

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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अध्याय 2: Chemical Changes and Reactions - Exercise 2 (A)

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सेलिना Concise Chemistry [English] Class 9 ICSE
अध्याय 2 Chemical Changes and Reactions
Exercise 2 (A) | Q 2.1

संबंधित प्रश्न

Complete and balance the following chemical equations:

`"H"_2"S"` + `"CI"_2`  `→`  


FILL IN THE BLANK

A .............. change is a temporary change.


FILL IN THE BLANK

The new substances formed during a chemical reaction are called the ..................


TRUE \ FALSE

Electrolytic refining is a method in which a thin coating of a metal is done over another metal.


Explain the type of reactions on the basis of the direction of reaction.


 Fill in the blank

A change in which the substance can be brought back to its original state is called a _______ change.


Name the type of chemical reaction shown by the following equation:

Fe + CuSO4 → FeSO4 + Cu


What do you understand by 'chemical reaction'?


What do you observe? When

Barium chloride is added to sodium sulphate solution


State the original colour of the following substance and colour of residue obtained after heating.

Zinc carbonate


Write your observation and a balanced equation in the case of the following substances being heated.

Copper nitrate. 


Give reason for the following:

The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌} 
between the reactants and products, formed in the chemical reaction.


Complete the statement by filling in the blank with the correct word:

The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.


Select the correct answer from the options given below:

State the gaseous product formed, when

An ammonium salt reacts with an alkali.


The chemical change is ______.


Which of the following is not an “element + element → compound” type reaction?


Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.


Write some materials prepared by chemical changes.


______ is a natural indicator.


Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.


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