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