Chemistry Midterm Quiz-2

Nomenclature of covalent compounds: Which of the following is INCORRECTLY named?

• CO₃²⁻ is carbonate ion

• CO₂ is carbon dioxide

• CH₄ is methane

• PO₄³⁻ is phosphide ion

Aufbau, Hund, & Pauli theory: Consider the electronic configuration 1s²2s²2p⁶3s³. Which of the following rule(s) for filling electronic configurations MUST be violated?

• Pauli only

• Aufbau, Hund and Pauli

• Aufbau only

• Aufbau and Pauli

Electronic configurations of atoms: no exceptions. What is the electronic configuration of Titanium, Ti?

• [Ar]4s²3d²

• [Ar]3s²3d²

• [Ar]3s²4d²

• [Kr]4s²3d²

Tags

NGSS.HS-PS1-1

Bonding – Rank polarity based on ΔEN. Consider the labeled bonds in the molecule below and rank them from least to most polar in terms of difference in electronegativity.

• a) d < c < a < e < b

• b) d < c < e < a < b

• c) a < b < c < d < e

• d) e < b < d < c < a

Tags

NGSS.HS-PS1-1

Lewis structures – assigning formal charge. If you draw formaldehyde, CH₂O with a hydrogen on each end of the C=O bond, what is the formal charge on the C and on the oxygen?

• a) +1 on the Carbon and -1 on the Oxygen

• b) 0 on the Carbon and 0 on the Oxygen

• c) -1 on the Carbon and +1 on the Oxygen

• d) 0 on the Carbon and -1 on the Oxygen

Lewis structures – resonance (delocalization). Which of the following species exhibit resonance/delocalization?

Which of the following molecules have expanded valence?

• c) II, III

• I) HCN

• II) O₃

• III) CO₃²⁻

• a) I, III

Which of the following has bond angles slightly less than 109.5°?

• a) CH₃⁺

• b) I₃⁻

• c) HOCl

• d) O₃

Which of the following is planar?

• a) SO₃²⁻

• b) H₃O⁺

• c) NO₃⁻

• d) NH₃

What is the shape (molecular geometry) of IF₄⁺?