Chemistry Midterm Quiz

Nomenclature of ionic compounds: How many lithium atoms are needed to correctly balance sulfur to form a neutral salt?

• 1

• 2

• 3

• 4

Nomenclature of covalent compounds: Which of the following is the correct name for CCl₄?

• Carbon tetrachloride

• Carbon chloride

• Monocarbon tetrachloride

• Chloroform

Bonding – Rank polarity based on ΔEN: Rank the bonds H-F, B-N, N-O, Be-H, C-F from least to greatest difference in electronegativity (ΔEN).

• Be-H < B-N < N-O < C-F < H-F

• Be-H < N-O < B-N < H-F < C-F

• N-O < Be-H < B-N < H-F < C-F

• N-O < Be-H < B-N < C-F < H-F

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Ionic compounds – rank lattice energy: Which of the following has the lowest lattice energy?

• KI

• KCl

• LiCl

• KBr

Tags

NGSS.HS-PS1-3

NGSS.HS-PS1-4

Which of the following compounds does not have unpaired electrons on the central atom?

• NH₃

• H₂O

• CH₄

• PH₃

Tags

NGSS.HS-PS1-2

Draw the Lewis structure for Ethylene, C₂H₄. How many bonds exist between the two carbons?

• 1

• 2

• 3

• 4

Which of the following is the correct Lewis structure of ethynol (C₂H₂O)?

• Option a

• Option b

• Option c

• Option d

Lewis structures – resonance (delocalization). Which of the following compounds does not exhibit resonance?

• CH₄

• O₃

• NO₃⁻

• CO₃²⁻

Octet exceptions – incomplete octet, radicals. Which of the following compounds is a radical?

• NH₃

• CH₃

• O₃

• BH₃

Octet exceptions – expanded valence. What is the number of electrons around the central atom in XeF₄?

• 10

• 4

• 8

• 12