DP Chemistry (last assessment 2024)

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Question 18M.2.hl.TZ1.2g.i

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.hl.TZ1.2g.i
Level hl Paper 2 Time zone TZ1
Command term Describe Question number g.i Adapted from N/A
g.i.
[Maximum mark: 2]
18M.2.hl.TZ1.2g.i

Calcium carbide, CaC2, is an ionic solid.

(g.i)

Describe how sigma (σ) and pi ( π ) bonds are formed.

 

[2]

Markscheme

sigma (σ):

overlap «of atomic orbitals» along the axial/internuclear axis

OR

head-on/end-to-end overlap «of atomic orbitals»

 

pi ( π ):

overlap «of p-orbitals» above and below the internuclear axis

OR

sideways overlap «of p-orbitals»

 

Award marks for suitable diagrams.

 

[2 marks]

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