CHEM 121 UBC FINAL (THEORY) EXAM WITH CORRECT QUESTIONS AND ANSWERS 2025

CHEM 121 UBC FINAL (THEORY) EXAM
WITH CORRECT QUESTIONS AND
ANSWERS 2025

 Compound - CORRECT ANSWERS .........A substance made up of atoms

of two or more different elements joined by chemical bonds, no overall

charge

 Ion - CORRECT ANSWERS .........An atom or group of atoms that has a

positive or negative charge. (not isolable)

 Isolable - CORRECT ANSWERS .........capable of being isolated

 ionic bond - CORRECT ANSWERS .........A chemical bond resulting from

the attraction between oppositely charged ions due to electrostatic

forces.

 when Ebinding > Elight - CORRECT ANSWERS .........no electrons will be

released

 superposition... - CORRECT ANSWERS .........changes the position of

electron density

 bonding MO - CORRECT ANSWERS .........constructive interferance

,  antibonding molecular orbital - CORRECT ANSWERS .........an orbital

higher in energy than the atomic orbitals of which it is composed

 the total # of MOs is _____ to the number of AOs. - CORRECT

ANSWERS .........equal

 bonding MOs have _____ nodes than antibonding MOs - CORRECT

ANSWERS .........fewer

 only ________________ MOS interact - CORRECT

ANSWERS .........energetically similar

 Aufbau Principle - CORRECT ANSWERS .........fill lowest energy orbital

first

 Pauli Exclusion Principle - CORRECT ANSWERS .........no two electrons in

the same atom can have the same set of four quantum numbers

 Hund's Rule - CORRECT ANSWERS .........electrons occupy degenerate

orbitals singly first

 .bond vibrations are caused by... - CORRECT ANSWERS .........Infrared

light

 rotational energy is caused by - CORRECT ANSWERS .........microwaves

 Electronic transitions are caused by - CORRECT

ANSWERS .........Ultraviolet light