Properties of materials - OCR Gateway

1

Why is graphite useful for lubricants?

2

What type of structure do both diamond and graphite have?

3

Why is diamond used on drill bits?

4

Why does graphite conduct electricity?

5

Which of the following substances might have a formula of C60?

6

A substance conducts electricity when it is dissolved in water, but not when it is solid. What type of substance is it?

7

Which statement about simple covalent molecules is correct?

8

Which of the following physical properties is typical of simple molecular substances?

9

What forces are overcome when a substance with a giant covalent structure melts or boils?

10

The melting point of sulfur is 115 °C and its boiling point is 445 °C. What state would sulfur be in at 200 °C?