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प्रश्न
Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.
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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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संबंधित प्रश्न
Give one example that illustrates the following characteristics of a chemical reaction:
Change in state
How do the following help in bringing about a chemical change?
light.
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
State four conditions necessary for chemical reactions to take place.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
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)
Oxygen is a ______ in respiration.
Explain the term reactant and product giving examples.
Give an example of a reaction where the following are involved
Electricity
Write the chemical reaction where the following changes are observed.
Physical state is changed
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
Name: Gas with rotten egg smell.
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
State the following reaction represent oxidation or reduction.
\[\ce{H->H+}\]
When magnesium is burnt in the air, a new substance is formed which is ______.
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
Write a note on the catalyst.
Write a note on the following:
Curdling of milk
______ is the chemical name of slaked lime.
