Properties of materials

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Question 8
Medium

The table below shows information about four different substances.

SubstanceMelting point (∘C^{\circ}\text{C}∘C)AppearanceElectrical conductor?
W660660660shiny solidyes
X801801801white crystalline solidyes when dissolved in water
Y130130130flexible solidno
Z444444waxy solidno
a.

Which of the substances is a polymer? Explain your answer.

[2]
b.

Explain why polymers without cross-links can stretch and flex much more than polymers with cross-links.

[2]
c.

A pair of electrician's pliers. Part A points directly to the outer protective grip coating the handles. Part B points to the metallic jaw of the pliers.

Which substances from the table would be best to use to make each part of the pliers? Explain your answers.

Part A (outer handle grip):

Part B (metal jaw):

[2]

Properties of materials Questions

  1. GCSE
  2. /Chemistry
  3. /Properties of materials