AQA GCSE Chemistry Unit 2.2

Matthew T
Quiz by , created over 5 years ago

Twenty questions for the second section of Unit 2 in AQA GCSE Chemistry: Structure and properties.

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Matthew T
Created by Matthew T over 5 years ago
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Question 1

Question
True or false? Ionic compounds have high melting points because the forces of electrostatic attraction holding them together are strong.
Answer
  • True
  • False

Question 2

Question
When will ionic compounds conduct electricity?
Answer
  • Solid
  • Liquid
  • In solution with water
  • Gas

Question 3

Question
True or false? Solid ionic compounds conduct electricity because the ions are locked tight together and can pass on charge.
Answer
  • True
  • False

Question 4

Question
What state would you expect to find simple covalent molecules such as methane in at room temperature?
Answer
  • Solid
  • Liquid
  • Gas

Question 5

Question
Why do simple covalent molecules have low melting and boiling points?
Answer
  • They are smaller so easier to break by heat energy
  • The intermolecular forces are weak and broken during heating
  • They don't have any metal atoms which are heavy and need a lot of heat energy to liquefy

Question 6

Question
True or false? Simple covalent molecules conduct electricity when liquid.
Answer
  • True
  • False

Question 7

Question
Which of these are allotropes of carbon?
Answer
  • Diamond
  • Silica
  • Lime
  • Graphite

Question 8

Question
Which of these describe the bonding in diamond?
Answer
  • Each carbon bonds to four others
  • Each carbon bonds to three others
  • Multidirectional
  • Layered
  • Rigid
  • Soft

Question 9

Question
Which of these describe the bonding in graphite?
Answer
  • Each carbon bonds to four others
  • Each carbon bonds to three others
  • Multidirectional
  • Layered
  • Rigid
  • Soft

Question 10

Question
What is a fullerene?
Answer
  • A chemical which is used to clean wool in industry
  • An allotrope of carbon formed of hexagonal rings
  • A protein released by the brain to control how much humans eat

Question 11

Question
True or false? We create alloys to reduce the malleability of metals by breaking up the layered structure of the metal.
Answer
  • True
  • False

Question 12

Question
True or false? The sea of delocalised electrons in metals prevents them from conducting electricity.
Answer
  • True
  • False

Question 13

Question
What is a shape memory alloy?
Answer
  • An alloy which is not malleable
  • An alloy which returns to its original shape upon heating
  • An alloy which is used to improve visual memory

Question 14

Question
What do the properties of a polymer depend on?
Answer
  • Reaction conditions
  • Monomer
  • Nothing - it is random
  • The age of the polymer

Question 15

Question
Which type of poly(ethene) is stronger?
Answer
  • Low density (LD) poly(ethene)
  • High density (HD) poly(ethene)

Question 16

Question
Which type of polymer has intermolecular forces broken down on heating?
Answer
  • Thermosoftening
  • Thermosetting

Question 17

Question
Which type of polymer has covalent crosslinks that are not broken down on heating?
Answer
  • Thermosoftening
  • Thermosetting

Question 18

Question
How big is 1 nanometre?
Answer
  • 10^-3 metres
  • 10^-6 metres
  • 10^-9 metres

Question 19

Question
True or false? Modern sunscreens use titanium oxide nanoparticles because they are more effective than conventional UV ray blockers.
Answer
  • True
  • False

Question 20

Question
True or false? Nanoparticles are ineffective catalysts due to their small size.
Answer
  • True
  • False