PCAT Chemistry 2

Question 1

Which type of intermolecular force is responsible for the unusually high boiling point of water compared to other small molecules?

Accepted Answer

Hydrogen bonding

Answer

Water's high boiling point results from hydrogen bonding, which occurs between the partially positive hydrogen atoms and the lone pairs on oxygen atoms of neighboring molecules.

Question 2

What is the hybridization of the carbon atom in CO2?

Accepted Answer

sp

Answer

Carbon in CO2 forms two double bonds with no lone pairs, resulting in sp hybridization and a linear molecular geometry.

Question 3

A buffer solution is most effective when the pH of the solution is:

Accepted Answer

Equal to the pKa of the weak acid

Answer

A buffer works best when pH = pKa, because at this point the concentrations of the weak acid and its conjugate base are equal, providing maximum buffering capacity.

Question 4

Which quantum number describes the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number (ml)

Answer

The magnetic quantum number (ml) specifies the orientation of an orbital in three-dimensional space relative to the other orbitals in the same subshell.

Question 5

In a galvanic cell, oxidation occurs at the:

Accepted Answer

Anode

Answer

Oxidation (loss of electrons) always occurs at the anode; in a galvanic cell, electrons flow from the anode through the external circuit to the cathode.

PCAT - Pharmacy College Admission Test Practice Test

PCAT - Pharmacy College Admission Test Practice Test

PCAT Chemistry 2