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Frage 1
Frage
True or false? Ionic compounds have high melting points because the forces of electrostatic attraction holding them together are strong.
Antworten
- True
- False
Frage 2
Frage
When will ionic compounds conduct electricity?
Antworten
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Solid
-
Liquid
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In solution with water
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Gas
Frage 3
Frage
True or false? Solid ionic compounds conduct electricity because the ions are locked tight together and can pass on charge.
Antworten
- True
- False
Frage 4
Frage
What state would you expect to find simple covalent molecules such as methane in at room temperature?
Antworten
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Solid
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Liquid
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Gas
Frage 5
Frage
Why do simple covalent molecules have low melting and boiling points?
Antworten
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They are smaller so easier to break by heat energy
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The intermolecular forces are weak and broken during heating
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They don't have any metal atoms which are heavy and need a lot of heat energy to liquefy
Frage 6
Frage
True or false? Simple covalent molecules conduct electricity when liquid.
Antworten
- True
- False
Frage 7
Frage
Which of these are allotropes of carbon?
Antworten
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Diamond
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Silica
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Lime
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Graphite
Frage 8
Frage
Which of these describe the bonding in diamond?
Antworten
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Each carbon bonds to four others
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Each carbon bonds to three others
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Multidirectional
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Layered
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Rigid
-
Soft
Frage 9
Frage
Which of these describe the bonding in graphite?
Antworten
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Each carbon bonds to four others
-
Each carbon bonds to three others
-
Multidirectional
-
Layered
-
Rigid
-
Soft
Frage 10
Frage
What is a fullerene?
Antworten
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A chemical which is used to clean wool in industry
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An allotrope of carbon formed of hexagonal rings
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A protein released by the brain to control how much humans eat
Frage 11
Frage
True or false? We create alloys to reduce the malleability of metals by breaking up the layered structure of the metal.
Antworten
- True
- False
Frage 12
Frage
True or false? The sea of delocalised electrons in metals prevents them from conducting electricity.
Antworten
- True
- False
Frage 13
Frage
What is a shape memory alloy?
Antworten
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An alloy which is not malleable
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An alloy which returns to its original shape upon heating
-
An alloy which is used to improve visual memory
Frage 14
Frage
What do the properties of a polymer depend on?
Antworten
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Reaction conditions
-
Monomer
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Nothing - it is random
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The age of the polymer
Frage 15
Frage
Which type of poly(ethene) is stronger?
Antworten
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Low density (LD) poly(ethene)
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High density (HD) poly(ethene)
Frage 16
Frage
Which type of polymer has intermolecular forces broken down on heating?
Antworten
-
Thermosoftening
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Thermosetting
Frage 17
Frage
Which type of polymer has covalent crosslinks that are not broken down on heating?
Antworten
-
Thermosoftening
-
Thermosetting
Frage 18
Frage
How big is 1 nanometre?
Antworten
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10^-3 metres
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10^-6 metres
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10^-9 metres
Frage 19
Frage
True or false? Modern sunscreens use titanium oxide nanoparticles because they are more effective than conventional UV ray blockers.
Antworten
- True
- False
Frage 20
Frage
True or false? Nanoparticles are ineffective catalysts due to their small size.
Antworten
- True
- False
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