Do giant ionic compounds have high or low boiling points?
High
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What form do giant structures take at room temp?
Solid
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What happens to the electrons when ionic compounds are melted?
They become free to move and can carry electrical charge through them - become conductors of electricity.
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Why can't simple molecules carry electricity?
They have no overall charge.
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What is a giant covalent structure?
When atoms form several covalent bonds and join together.
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What do diamond and graphite have in common?
They are both made from carbon and are giant covalent structures
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What makes diamond hard and transparent?
Its carbon atoms bond with four other atoms - this makes a 3D structure
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What makes graphite soft?
Its carob atoms join tothree other in layers. These layers sit on top of each other.
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What do the layers in graphite mean for its uses and properties?
The layers of atoms can slip off, meaning pencils leave a mark on paper as the layers get deposited on it.
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Graphite atoms only bond with 3 other atoms - what does this allow?
They can conduct electricity as there is a delocalised electrons in the structure.
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Which has strong bonds between atoms? Graphite or diamond?
Diamond
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What properties of giant metalic structures allows it to be bend?
Layers of atoms
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What can metalic structures be made into?
Wires (ductile), rods and sheet material
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What are alloys
Mixtures of atoms.
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What do allows contain and what does this mean for its properties?
Different sized atoms - They layes are distorted and this means it is more difficult to slide them over each other. This makes allows harder than pure metals.
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What are SMA
Shape memory alloys - can be bent or deformed and when heated they will return to their original shape. Used for dental braces
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What is a polymer?
A long chain of carbon atoms
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Why do LD and HD poly(ethene) have different properties?
They are made using different reaction conditions; they have different structures or different shaped molecules.
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What is a thermosoftening polymer?
A polymer that can be shaped and reshaped by heating.
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What is nanoscience?
The study of particles that are between 1 and 100 nanometres in size
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What is a nanometre
one billionth of a metre (x10^-9)
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What is aWhat can nanoparticles be used for?
highly sensitive sensors, catalysts, coatings, cosmetics (e.g. suncream and deoderant).
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Why does more research need to be done on nanoscience?
Because we are still uncertain of their effects on our bodies and health if they got into the air etc.
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Other cards in this set
Card 2
Front
What form do giant structures take at room temp?
Back
Solid
Card 3
Front
What happens to the electrons when ionic compounds are melted?
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