DP Chemistry (last assessment 2024)

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Question 18M.2.sl.TZ1.2d.i

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

Calcium carbide, CaC2, is an ionic solid.

(d.i)

Suggest two reasons why solid calcium has a greater density than solid potassium.

[2]

Markscheme

Any two of:

stronger metallic bonding

smaller ionic/atomic radius

 

two electrons per atom are delocalized

OR

greater ionic charge

 

greater atomic mass

 

Do not accept just “heavier” or “more massive” without reference to atomic mass.

[2 marks]

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