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ICSE Class 9 Chemistry Question 10 of 18

Chemical Changes & Reactions — Question 18

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Question 18

Supply of energy maybe required to initiate a reaction. State the different forms with a suitable example of reactions initiated by supply of energy.

Answer

Different forms of energy :

(i) Heat energy:

     N2+O2→3000°C2NO\text{N}_2 + \text{O}_2 \xrightarrow {3000\degree \text{C}} 2\text{NO}

(ii) Light energy:

     H2+Cl2→Sunlight2HCl\text{H}_2 + \text{Cl}_2 \xrightarrow {\text{Sunlight}} 2\text{HCl}

(iii) Electricity:

     2H2O[acidified]→CurrentElectric2H2[cathode]+O2[anode]\underset{\text{[acidified]}}{2\text{H}_2\text{O}} \xrightarrow[\text{Current}]{\text{Electric}} \underset{\text{[cathode]}}{2\text{H}_2} + \underset{\text{[anode]}}{\text{O}_2}

(iv) Pressure :

     N2+3H2⇌200 atmos. pressureFe/450-500 °C 2NH3\text{N}_2 + 3\text{H}_2 \xrightleftharpoons[\text{200 atmos. pressure}]{\text{Fe/450-500 \degree C }} \text{2NH}_3

(v) Catalyst :

     4NH3+5O2→Pt./800°C4NO+6H2O4\text{NH}_3 + 5\text{O}_2 \xrightarrow {\text{Pt.}/800\degree \text{C}} 4\text{NO} + 6\text{H}_2\text{O}

(vi) Sound Energy:

      C2H2[acetylene]→EnergySound2C+H2\underset{\text{[acetylene]}}{\text{C}_2\text{H}_2} \xrightarrow[\text{Energy}]{\text{Sound}} 2\text{C} + \text{H}_2