DP Chemistry (last assessment 2024)

Test builder »

Question 18M.2.sl.TZ2.6b

Select a Test
Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.sl.TZ2.6b
Level sl Paper 2 Time zone TZ2
Command term Deduce Question number b Adapted from N/A
b.
[Maximum mark: 2]
18M.2.sl.TZ2.6b

Some physical properties of molecular substances result from the different types of forces between their molecules.

(b)

Lewis structures show electron domains and are used to predict molecular geometry.

Deduce the electron domain geometry and the molecular geometry for the NH2− ion.

 

[2]

Markscheme

Electron domain geometry:

tetrahedral

Molecular geometry:

bent/V-shaped/angular

 

Both marks can be awarded for clear diagrams. Electron domain geometry requires a 3-D diagram showing the tetrahedral arrangement.

[2 marks]

Syllabus sections