Question1. The fact that some pure solutions of hydrocarbons do not readily evaporate at room temperature is a result of- Select one:

a. London dispersion forces.  

b. The hydrophobic effect.  

c. Extensive hydrogen bonding.  

d. The existence of a permanent dipoles.  

e. All of the answers are correct.

Question2. The bonding geometry of C,O,N is determined by- Select one:  

a. The number of electrons in their outer energy level  

b. SP3 hybridization of orbitals in the valence shell  

c. The number of double-or triple- bonds they make with other atoms in the molecule  

d. All of the above

Question3. The greatest buffering capacity of weak acids is when- Select one:  

a. They are almost completely dissociated  

b. They are almost completely undissociated  

c. They are nearly half dissociated  

d. The ratio between [A-] and [HA] is very high  

e. None of the answers is correct

Question4. The dominant bonds holding together non-polar compounds that are immersed in aqueous solution are _________, and the forces that hold pure solutions of non-polar compounds are ____________. Select one:  

a. hydrogen bonds;dispersion  

b. hydrogen bonds;hydrophobic  

c. hydrophobic;dispersion  

d. hydrophobic;hydrogen bonds