BCHS 3304 EXAM 1 finale prep

If completely dehydrated, human body would have _____ as the most abundant element.

• N

• C

• O

• P

• None of the above

About evolution, which of the following statement is NOT true?

• Evolution is ongoing

• Evolution is constrained by its past

• Evolution is not goal directed

• Evolution is about selection for the best traits, therefore no sloppiness is tolerated.

• All of above are true

The first thermodynamic law says _____

• If free energy change is negative, a reaction is spontaneous

• Energy cannot be created or destroyed. It can only be conserved.

• Entropy tends to increase

• Enthalpy tends to decrease

• None of the above

Which of the following represents an increase in entropy?

• Gas is compressed to a smaller volume

• A salt solution crystalizes

• A reaction releases heat to the surroundings

• 2NH₃ → N₂+3NH₂

• all of the above

If _____, a reaction would be spontaneous regardless of temperature.

• ΔH<0 and ΔS>0

• ΔH>0 and ΔS>0

• ΔH<0 and ΔS<0

• ΔH>0 and ΔS<0

About free energy change and enzyme catalyst, which of the following statements is true?

• If ΔG is negative, the reaction would happen at a high rate

• Enzymes accelerate reactions by dropping ΔG

• Enzymes accelerate reactions but it cannot change ΔG

• Enzymes make a reaction spontaneous even if ΔG>0

• None of the above

Rank the following interactions in order of increasing strength (start with the weakest interaction).

• ionic interactions, hydrogen bonds, London dispersion forces, covalent bonds

• London dispersion forces, hydrogen bonds, ionic interactions, covalent bonds

• London dispersion forces, ionic interactions, hydrogen bonds, covalent bonds

• covalent bonds, London dispersion forces, ionic interactions, hydrogen bonds

• hydrogen bonds, London dispersion forces, ionic interactions, covalent bonds

Liquid water freezes to become ice. In this process, there is ______

• Increase in entropy, increase in density

• Increase in entropy, decrease in density

• Decrease in entropy, increase in density

• Decrease in entropy, decrease in density

The following structures illustrate hydrogen bonds between water and other organic functional groups. In __a__, the functional group acts as both hydrogen bond acceptor and donor.

• a
• b

• c

• d

Please name the following functional group.

• Aldehyde

• Thiol

• Ester

• Ether

• Amino