DP Chemistry (last assessment 2024)

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Question 17N.3.sl.TZ0.4a

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.3.sl.TZ0.4a
Level sl Paper 3 Time zone TZ0
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 2]
17N.3.sl.TZ0.4a

It is wise to fill dental cavities before irreversible tooth decay sets in. An amalgam (alloy of mercury, silver, and other metals) is often used although many prefer a white composite material.

(a)

Outline the composition of an alloy and a composite.

[2]

Markscheme

Alloy:
mixture of metal with other metals/non-metals

OR

mixture of elements that retains the properties of a metal

Composite:
reinforcing phase embedded in matrix phase

Award [1 max] for implying “composites only have heterogeneous/nonhomogeneous compositions”.

[Max 2 Marks]

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