OnRamps Unit 2 Exam1

Bonding – Rank polarity based on change in EN Rank the bonds 

H-F, B-N, N-O, Be-H, C-F 

From least to greatest difference in electronegativity 

• 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 

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-PS2-4

Ionic compounds – rank lattice energy

Rank the crystal lattice energy of the salts

MgBr₂, KNO₃, SrS, LiF, CaI₂ From greatest to least

• SrS > CaI2 > MgBr2 > KNO3 > LiF

• SrS > MgBr2 > CaI2 > LiF > KNO3

• KNO3 > SrS > MgBr2 > CaI2 > LiF

• SrS > CaI2 > MgBr2 > LiF > KNO3

Tags

NGSS.HS-PS1-3

NGSS.HS-PS2-4

Lewis structures – ionic compounds

Which of the following salts has an incorrect structure?

• CaCl₂

• NaI

• CaO

• MgBr

Tags

NGSS.HS-PS1-3

Lewis structures – ionic compounds

Which of the following is not a common formula unit for the salts made with main groups cations and anions?

• AB

• AB2

• A₂B₃

• AB₄

Lewis structures – simple

Which of the following atoms has an s²p ³ valence electron configuration?

• Ga

• Ge

• As

• Se

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Lewis structures – simple

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

• NH₃

• H₂O

• CH₄

• PH₃

Lewis structures – multiple central atoms

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

• 1

• 2

• 3

• 4

Lewis structures – multiple central atoms

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

• a

• b

• c

• d

Lewis structures – resonance (delocalization)

Which of the following compounds does not exhibit resonance?

• CH₄

• O₃

• NO₃ ^-

• CO₃ ^2-