CDO IB Chemistry Unit 5 Extra Practice

Which compound has the shortest C–N bond?

• CH₃NH₂

• (CH₃)₃CNH₂

• CH₃CN

• CH₃CHNH

Which combination describes the sulfate(IV) ion, SO₃²⁻ (also known as sulfite ion)?(Electron domain geometry | Molecular geometry | O-S-O angle | )

• trigonal planar | trigonal planar | 120°

• tetrahedral | trigonal pyramidal | 109.5°

• trigonal planar | trigonal pyramidal | 107°

• tetrahedral | trigonal pyramidal | 107°

Which metal has the strongest metallic bond?

• Li

• Na

• K

• Rb

How many bonding electrons are there in the urea molecule?

• A. 8

• B. 16

• C. 20

• D. 24

What is the hybridization state and electron domain geometry around the circled C, N, and O atoms?

• C: sp3 and tetrahedral, O: sp2 and trigonal planar, N: sp2 and trigonal planar

• C: sp2 and trigonal planar, O: sp and linear, N: sp3 and tetrahedral

• C: sp3 and tetrahedral, O: sp and linear, N: sp2 and trigonal planar

• C: sp3 and trigonal pyramidal, O: sp2 and trigonal planar, N: sp3 and trigonal pyramidal

How many sigma (σ) and pi (π) bonds are present in this molecule?

• σ: 12, π: 6

• σ: 14, π: 5

• σ: 16, π: 6

• σ: 17, π: 5

Which combination describes the PH₄+ ion?

• Molecular geometry: Tetrahedral, Central atom hybridization: sp3

• Molecular geometry: Square planar, Central atom hybridization: sp3

• Molecular geometry: Tetrahedral, Central atom hybridization: sp2

• Molecular geometry: Square planar, Central atom hybridization: sp2

Which combination describes the bonding and structure in benzoic acid, C₆H₅COOH?

• 3 electron domains, 6 π-electrons, 6 σ-bonds

• 3 electron domains, 8 π-electrons, 15 σ-bonds

• 4 electron domains, 6 π-electrons, 6 σ-bonds

• 4 electron domains, 8 π-electrons, 10 σ-bonds

Which species have resonance structures?

• A. I and II only

• B. I and III only

• C. II and III only

• D. I, II and III

Which does not show resonance?

• PO₄^3-

• B. C₆H₆

• C. C₆H₁₂

• D. O₃