Properties of materials

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12
Question 1
Hard

The table below shows information about four different substances.

SubstanceMelting point (∘C^{\circ}\text{C}∘C)AppearanceElectrical conductor?
P108510851085shiny orange-brown solidyes
Q115115115translucent flexible solidno
R146514651465white crystalline powderyes when dissolved in water
S585858white waxy 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.

[3]
c.

A screwdriver with labeled parts. Part A points to the handle/grip. Part B points to the metallic shaft.

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

Part A (outer handle grip):

Part B (metal shaft/tip):

[4]

Properties of materials Questions

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