858083
Questão 1
Questão
True or false? Ionic compounds have high melting points because the forces of electrostatic attraction holding them together are strong.
Responda
- True
- False
Questão 2
Questão
When will ionic compounds conduct electricity?
Responda
-
Solid
-
Liquid
-
In solution with water
-
Gas
Questão 3
Questão
True or false? Solid ionic compounds conduct electricity because the ions are locked tight together and can pass on charge.
Responda
- True
- False
Questão 4
Questão
What state would you expect to find simple covalent molecules such as methane in at room temperature?
Responda
-
Solid
-
Liquid
-
Gas
Questão 5
Questão
Why do simple covalent molecules have low melting and boiling points?
Responda
-
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
Questão 6
Questão
True or false? Simple covalent molecules conduct electricity when liquid.
Responda
- True
- False
Questão 7
Questão
Which of these are allotropes of carbon?
Responda
-
Diamond
-
Silica
-
Lime
-
Graphite
Questão 8
Questão
Which of these describe the bonding in diamond?
Responda
-
Each carbon bonds to four others
-
Each carbon bonds to three others
-
Multidirectional
-
Layered
-
Rigid
-
Soft
Questão 9
Questão
Which of these describe the bonding in graphite?
Responda
-
Each carbon bonds to four others
-
Each carbon bonds to three others
-
Multidirectional
-
Layered
-
Rigid
-
Soft
Questão 10
Questão
What is a fullerene?
Responda
-
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
Questão 11
Questão
True or false? We create alloys to reduce the malleability of metals by breaking up the layered structure of the metal.
Responda
- True
- False
Questão 12
Questão
True or false? The sea of delocalised electrons in metals prevents them from conducting electricity.
Responda
- True
- False
Questão 13
Questão
What is a shape memory alloy?
Responda
-
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
Questão 14
Questão
What do the properties of a polymer depend on?
Responda
-
Reaction conditions
-
Monomer
-
Nothing - it is random
-
The age of the polymer
Questão 15
Questão
Which type of poly(ethene) is stronger?
Responda
-
Low density (LD) poly(ethene)
-
High density (HD) poly(ethene)
Questão 16
Questão
Which type of polymer has intermolecular forces broken down on heating?
Responda
-
Thermosoftening
-
Thermosetting
Questão 17
Questão
Which type of polymer has covalent crosslinks that are not broken down on heating?
Responda
-
Thermosoftening
-
Thermosetting
Questão 18
Questão
How big is 1 nanometre?
Responda
-
10^-3 metres
-
10^-6 metres
-
10^-9 metres
Questão 19
Questão
True or false? Modern sunscreens use titanium oxide nanoparticles because they are more effective than conventional UV ray blockers.
Responda
- True
- False
Questão 20
Questão
True or false? Nanoparticles are ineffective catalysts due to their small size.
Responda
- True
- False
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