CHEM 115 EXAMS SCRIPT 2026.pdf 1. Document information

CHEM 115 EXAMS SCRIPT 2026/2027 QUESTIONS AND
SOLUTIONS RATED A+
✔✔. Which molecule listed below has a nonpolar covalent bond?
A) H2O
B) H2
C) NaCl
D) all of the compounds
E) none of the compounds - ✔✔B

✔✔Which compound listed below will dissolve in water?
A) NH3
B) SiO2
C) CCl4
D) all of the compounds
E) none of the compounds - ✔✔A

✔✔What is the molecular geometry if you have a double bond, a single bond and 1 lone
pair around
the central atom?
A) linear
B) tetrahedral
C) trigonal pyramidal
D) bent
E) not enough information - ✔✔D

✔✔How does soap work?
A) Soap works by breaking grease molecules into smaller molecules that dissolve in
water.
B) Soap works by having a polar end and a nonpolar end which allows the water and oil
to
interact indirectly.
C) Soap works by making water into a nonpolar liquid which grease can dissolve in.
D) Soap works by by having a polar end which attaches to the grease molecule and
polarizes it
and turns the grease molecule into another soap molecule. This is a chain reaction.
E) none of the above - ✔✔B

✔✔Which of the following statements are TRUE about the BF3 molecule?
A) BF3 has a trigonal planar molecular geometry.
B) BF3 is nonpolar.
C) BF3 violates the octet rule for the central atom.
D) All of the above statements are true.
E) None of the above are true. - ✔✔D

, ✔✔The electron geometry and the molecular geometry of ammonia (NH3
) are, respectively,
A) tetrahedral, bent.
B) tetrahedral, trigonal pyramidal.
C) tetrahedral, tetrahedral.
D) trigonal planar, bent.
E) none of the above - ✔✔B

✔✔. Lewis theory predicts that the formula for a compound between fluorine and
calcium is:
A) Ca2F
B) CaF3
C) CaF2
D) CaF
E) none of the above - ✔✔C

✔✔What is the molecular geometry of PH3?
A) bent
B) linear
C) trigonal pyramidal
D) tetrahedral
E) not enough information - ✔✔C

✔✔. Which of the following has a tetrahedral electron geometry and a trigonal pyramidal
molecular
geometry?
A) PF3
B) Br2O
C) GeH4
D) SO2
E) none of the above - ✔✔A

✔✔Which intermolecular forces are found in CO2?
A) dispersion forces
B) dispersion forces and dipole-dipole forces
C) dipole-dipole forces
D) hydrogen bonding
E) none of the above - ✔✔A

✔✔Intermolecular forces are responsible for:
A) the function of DNA.
B) the existence of liquids and solids.
C) the taste sensations.
D) the shape of protein molecules.
E) all of the above - ✔✔E