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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

How Do the Following Help in Bringing About a Chemical Change? Pressure . - Chemistry

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प्रश्न

How do the following help in bringing about a chemical change?

pressure.

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उत्तर

Some chemical reactions take place when reactants are subjected to high pressure.
e.g: Nitrogen and hydrogen when subjected to high pressure produce ammonia gas.

\[\ce{N2+3H2⇌[450°C][200 atm] 2NH3}\]

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अध्याय 6: Chemical Reactions - Exercise 1 [पृष्ठ ७३]

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सेलिना Concise Chemistry [English] Class 8 ICSE
अध्याय 6 Chemical Reactions
Exercise 1 | Q 3.1 | पृष्ठ ७३

संबंधित प्रश्न

Changes in which new substances are formed are called ______ changes.


Define catalyst.


Write a short note on the information derived from a balanced chemical equation.


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)

The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.


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.


When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.


Complete and balance the following reaction:

\[\ce{NH3 + O2 ->[\Delta]}\]


Name: Two carbonates do not produce carbon dioxide on heating.


Give a chemical test to distinguish between the following gases. 

H2 and CO2


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 iodine crystals Colour of vapours evolved  

Complete the table given below.

Heat on  Zinc nitrate Colour of residue  

Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.


Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.


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

Zinc carbonate.


The chemical change is ______.


Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.


The changes in which new substance with new chemical properties are formed are ______.


Which of the following is/are true when milk changes into curd?

  1. Its state is changed from liquid to semi solid.
  2. It changes colour.
  3. It changes taste.
  4. The change cannot be reversed.

Choose the correct option from below:


The reaction of H2 gas with oxygen gas to form water is an example of ______.


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