Page 25 - ACE YR IGCSE A TOP APPROACH TO CHEM

9 The table shows the melting points, boiling points and electrical properties of five substances,
A to E.

electrical electrical
melting point / boiling point /
substance conductivity conductivity
°C °C
of solid of liquid
A –7 59 poor poor
B 1083 2567 good good

C 755 1387 poor good
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D 43 181 poor poor
E 1607 2227 poor poor

(a) Which substance in the table has ionic bond? Explain your answer.

[4]

(b) Which substance in the table is a macromolecule?

[1]

(c) Which substance is a liquid at room temperature?

[1]

(d) Substance B is a metal.

(i) Explain why substance B is a good conductor of electricity.

[1]

(ii) Give one chemical property of a metal.

[1]

(e) Which substance is a covalent compound and a solid at room temperature? Explain your
answer.

[3]
[Total: 11]

Cambridge IGCSE TM
22 Ace Your Chemistry

Chapter 2.indd 22 3/4/22 11:59 AM