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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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संबंधित प्रश्न
TRUE \ FALSE
Ammonia is a good oxidizing agent.
What are chemical reactions?
Define chemical reaction.
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Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
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Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.
Match the pairs.
| a. | Photosynthesis | i. | Tendency to lose electrons |
| b. | Water | ii. | Reactant in combustion process |
| c. | Sodium chloride | iii. | Chemical change |
| d. | Dissolution of salt in water | iv. | Covalent bond |
| e. | Carbon | v. | Ionic bond |
| f. | Fluorine | vi. | Physical change |
| g. | Magnesium | vii. | Tendency to form anion |
State the conditions necessary for a chemical change or reaction.
Give an example of a reaction where the following are involved:
Solution
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Ammonium dichromate.
Write your observation and a balanced equation in the case of the following substances being heated.
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Higher order Thinking question
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Give two examples for the following case:
Chemical changes
Write a note on the catalyst.
Write a note on the following:
Curdling of milk
