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Addition of heat to a system increases the randomness in the system due to increase in molecular motions. Generally, a system at a higher temperature has greater randomness than at lower temperature. Thus, temperature too helps in the measurement of randomness of particles in a system. Heat added to a system at lower temperature causes greater randomness than in comparison to when heat is added to it at a higher temperature. Thus, entropy change is inversely proportional to the temperature of the system.
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|
Sigma Bond |
Pi Bond |
|
During sigma bond formation overlapping orbitals can be either one hybrid and one pure orbital or two pure orbitals and two hybrid orbitals. |
During pi bond formation overlapping orbitals are always two unhybridized orbitals. |
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Sigma bond exists independently and allows free rotation. |
Pi-bond always exists along with sigma bond and the rotation is restricted. |
|
Sigma bonds are stronger bonds. |
Pi bonds are usually less powerful compared to sigma bonds. |
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Sigma bonds are formed first when atoms interact. |
Pi bonds are formed after the formation of sigma bonds. |
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During the bonding between two atoms, Only one sigma bond is formed. |
Here two pi bonds can exist between two atoms. |
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Nidhi Tiwari 6 years, 10 months ago
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