Question

TRUE OR FALSE *freezing water is possible only if the entropy of the surroundings increases

· Liquid water has a lower entropy than liquid benzene at 25°C because of hydrogen bonding in water.

· Ice at 0°C has a higher entropy than liquid water at 0°C because the density of ice is lower than the density of water.

· It is impossible to freeze ethanol because the change in entropy of the system is negative.

· Binding a substrate to an enzyme always lowers the entropy because the substrate loses translational and rotational degrees of freedom.

· Entropy is the main driving force in the formation of the DNA double helix.

· Evaporating a liquid has always a positive change in entropy

· All elements in their standard states have an entropy of zero at 25°C.

· Reactions that involve only gases always have a positive change in entropy · The chemical potential of a solute in a mixture does not depend on the concentration of the solute because it is the molar Gibbs free energy of the substance. · For a reaction A ->2B, the ∆G of the reaction is negative as long as μA > μB · The activity of a 1M solution of a solute is a = 1 only if we assume that the solution is ideal. · The ∆G° of a reaction is zero when the reaction is at equilibrium. · ∆G° and ∆G°’ are the same for a reaction does not involve hydrogen ions

Answer 1

*freezing water is possible only if the entropy of the surroundings increases --> True, since system is getting ordered, entropy of system decreases, so entropy of surroundings must increase.

· Liquid water has a lower entropy than liquid benzene at 25°C because of hydrogen bonding in water. --> False, water will not have lower entropy, this is directly proportional to mass

· Ice at 0°C has a higher entropy than liquid water at 0°C because the density of ice is lower than the density of water. --> false, since liquid is much more chaotic, particles are able to move

· It is impossible to freeze ethanol because the change in entropy of the system is negative. --> false,it will acutally freeze beyond its freezing point

· Binding a substrate to an enzyme always lowers the entropy because the substrate loses translational and rotational degrees of freedom. --> false, this is "ordered" system, so entropy decreases because of it