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प्रश्न
What do you understand by 'chemical reaction'?
उत्तर
A chemical reaction is the process of breaking the chemical bonds of the reacting substances (reactants) and making new bonds to form new substances (products).
A chemical change or chemical reaction occurs when particles collide. Collisions occur when reactants are in close contact or by supply of energy.
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संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
Complete and balance the following chemical equations:
N2 + O2 →
Complete and balance the following chemical equations
Na + H2 O →
TRUE \ FALSE
Ammonia is a good oxidizing agent.
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
True or false
New substances are formed in a chemical change.
Explain the following reaction with one suitable example of Displacement 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)
Electron ______ is complete in each hydrogen in a hydrogen molecule.
Choose the correct option from the bracket and explain the statement giving a reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
Addition of an aqueous solution of ZnSO4 to an aqueous solution of BaCl2 is an example of ______ reaction.
Give an example of the following chemical change.
A reaction where colour change is noticed
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
What do you understand by precipitation reaction? Explain with examples.
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
Give reason for the following:
Electrolytic decomposition of water is a reaction involving change of state.
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
______ is a natural indicator.
Write word equations for two chemical reactions with the help of materials given in the box.
Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water
Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.
How would you show that the settling of curd is a chemical change?
Write a note on the following:
Fermentation
