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True or false? Ionic compounds have high melting points because the forces of electrostatic attraction holding them together are strong.
When will ionic compounds conduct electricity?
In solution with water
True or false? Solid ionic compounds conduct electricity because the ions are locked tight together and can pass on charge.
What state would you expect to find simple covalent molecules such as methane in at room temperature?
Why do simple covalent molecules have low melting and boiling points?
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
True or false? Simple covalent molecules conduct electricity when liquid.
Which of these are allotropes of carbon?
Which of these describe the bonding in diamond?
Each carbon bonds to four others
Each carbon bonds to three others
Which of these describe the bonding in graphite?
What is a fullerene?
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
True or false? We create alloys to reduce the malleability of metals by breaking up the layered structure of the metal.
True or false? The sea of delocalised electrons in metals prevents them from conducting electricity.
What is a shape memory alloy?
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
What do the properties of a polymer depend on?
Nothing - it is random
The age of the polymer
Which type of poly(ethene) is stronger?
Low density (LD) poly(ethene)
High density (HD) poly(ethene)
Which type of polymer has intermolecular forces broken down on heating?
Which type of polymer has covalent crosslinks that are not broken down on heating?
How big is 1 nanometre?
True or false? Modern sunscreens use titanium oxide nanoparticles because they are more effective than conventional UV ray blockers.
True or false? Nanoparticles are ineffective catalysts due to their small size.