In: Chemistry
1. (a) State if the sign in (+) or (-) for the following description.
Q is ( ) if the test tube is getting hot.
W is ( ) if the system is expanding.
W is ( ) if the work is done by the surrounding on the system.
H is ( ) if the reaction is endothermic.
S is ( ) if solid sublimes.
G is ( ) if the reaction is spontaneous.
(e) Define entropy. Give an example of a reaction that would increase entropy.
Q is positive that means heat energy is released during the reaction.
Test tube is getting hot because of the evolution of heat energy.
This is an example of exothermic reaction.
W is positive when the work is done by the system.
W is negative when the work is done on the system by the surroundings.
H is positive when the reaction is endothermic.
During an endothermic reaction, heat energy is absorbed by the system.
S(entropy) is positive during sublimation of a solid.
This is because the degree of disorderness increases in case of gases.
G is negative in case of spontaneous reactions.
(e) Entropy is the thermodynamic physical quantity which represents the degree of disorderness of the system.
example: Burning of inscence stick is an example of positive entropy.
Where disorderness of the molecules increases.