मराठी
सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Define chemical reaction.

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प्रश्न

Define chemical reaction.

व्याख्या
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उत्तर

Any chemical change in matter that involves its transformation into one or more new substances is called a chemical reaction.

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पाठ 5: Language of Chemistry - Exercise

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Exercise | Q 1.1
सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Additional questions | Q 1.1

संबंधित प्रश्‍न

How would you show that setting of curd is a chemical change?


Complete and balance the following chemical equations

NaCI + `AgNO_3`  `→`


Give a reason.

Wasp sting is treated with vinegar.


MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

 Which one of the following alters the rate of the chemical reaction without itself undergoing any change?

  1. temperature and Pressure
  2. concentration of reactants
  3. presence of catalyst
  4. none of these

Name three reducing agents ?


Fill in the blank:
The substances which undergo chemical change are called _______


Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.


Reactants Products Type of chemical reaction
BaCl2(aq) + ZnSO4(aq) H2CO3(aq) Displacement
2AgCl(s) FeSO4(aq) + Cu(s) Combination
CuSO4(aq) + Fe(s) BaSO4↓ + ZnCl2(aq) Decomposition
H2O(l) + CO2(g) 2Ag(s) + Cl2(g) Double displacement

Write the chemical reaction where the following changes are observed.

Colour change is noticed


Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.


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 balanced equation for the following conversion affected by heat alone on the substance:

Ammonium dichromate to nitrogen


Complete the table given below.

Heat on ammonium dichromate Name of neutral gas evolved  

Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.


Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.


_____ is the basic material to manufacture urea.


Chemists identify gypsum as a natural indicator.


Write some materials prepared by chemical changes.


______ is a natural indicator.


The chemical name of baking soda is sodium bicarbonate.


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