Lewis Formula | Gradegorilla IB Chemistry Questions

Target: 10 Questions in 10 minutes

An IB Chemistry data booklet is helpful

1.Which row shows the correct bond angles for the SO₂ and SO₃ molecules?

	SO₂	SO₃
A	180^o	180^o
B	119^o	120^o
C	120^o	120^o
D	180^o	120^o

ABCD

2. Which pair of species has the same bond angles?

A. NH₃ and NH₄⁺
B. BeCl₂ and SCl₂
C. PO₄^3- and CH₄
D. CO₂ and SO₂

ABCD

3. Which row shows the correct electron domain geometry and molecular geometry for the SF₄^2- ion?

	Electron domain geometry	Molecular geometry
A	tetrahedral	see-saw
B	trigonal bipyramidal	tetrahedral
C	trigonal bipyramidal	see-saw
D	octahedral	square planar

ABCD

4. How many electron domains are on the middle iodine atom in the triiodide ion, I₃^-?

A. 1
B. 3
C. 5
D. 7

ABCD

5. Which of the following sets of molecules all have a net dipole moment?

A. NH₃, CH₃Cl and SCl₂
B. BeCl₂, BF₃ and PCl₃
C. PF₅, SO₂ and OF₂
D. CO₂, SO₃ and H₂O

ABCD

6. What is the approximate F-Br-F bond angle in the molecule BrF₃?

A. 120°
B. 109.5°
C. 90°
D. 86°

ABCD

7. What is the formal charge for the central N atom in the azide ion N₃^-, which has the following Lewis formula?

azide_lewis_diagram

A. -2
B. -1
C. 0
D. +1

ABCD

8. Considering the electronegativities of each element and based on formal charge calculations, which of the following is the preferred Lewis formula for SO₂Cl₂?

4 x structure of monomer

ABCD

9. What is the shape of the cyanate ion, NCO^-?

A. Linear
B. Bent V-shaped
C. Trigonal planar
D. Trigonal pyramidal

ABCD

10. Which of the following molecules are polar?

I. cis-1,2-dibromoethene

II. trans-1,2-dibromooethene

III. 1,1-dibromoethene

A. I and II only
B. I and III only
C. II and III only
D. I, II and III

ABCD