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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Explain the Term ‘Chemical Reaction’ with Special Reference to – ‘Reactants’ and ‘Products’.

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प्रश्न

Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.

एका वाक्यात उत्तर
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उत्तर

A chemical reaction involves the breaking of existing bonds between atoms or groups of atoms of the reactants and leading to formation of new bonds forming new substances called the products.

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पाठ 5: Language of Chemistry - Exercise

संबंधित प्रश्‍न

Give a reason.

Wasp sting is treated with vinegar.


MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

Reduction is a chemical reaction in which there is

  1. removal of hydrogen
  2. removal of oxygen
  3. addition of oxygen
  4. none of these

MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

 

Miscible liquids having slightly different boiling points can be separated by the

  1. evaporation
  2. distillation
  3. fractional distillation
  4. sedimentation

How is precipitate formation in a chemical reaction indicated?


What do you observe when :

an iron nail is kept in tap water for few days


Fill in the blank:

In some chemical reactions an insoluble ________ is formed when two solutions are mixed.


Explain the following reaction with one suitable example of Double decomposition reaction.


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.


Give an example of a reaction where the following are involved

Heat


Give an example of a reaction where the following are involved:

Close contact


Complete the following table and write your observations.

 

Hydrogen sulphide

Ammonia

Sulphur dioxide

Hydrogen chloride

Shake the gas with red litmus solution

       

Shake the gas with blue litmus solution

       

Apply a burning splint to a gas

       

Name: A greenish-yellow gas.


Select the correct answer for the following options:

The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.


Give a word equation for the following reaction.

A compound which on heating shows – colour change from brown to yellow.


Complete the table given below.

Heat on  copper carbonate Test for gas evolved  

Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.

Calcium hydroxide.


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


Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings


Give an example where heat, light, and sound are produced during a chemical change.


We are advised to not to play with fireworks. Give reason.


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