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26 Cards in this Set
- Front
- Back
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What happens when elements react? |
They form compounds |
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What is a compound? |
A substance containing 2 or more elements |
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What is ionic bonding? |
A reaction that involves losing or gaining electrons |
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What is an ion? |
An atom that has lost or gained electrons |
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What happens when oppositely charged forces attract? |
It results in a strong compound (3d lattice) |
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What does ionic bonding happen between? |
Metals and non metals |
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Why do ionic bonds have high melting points? |
The lattices are strong, so it takes a lot of energy to break them. There is also lots of them and they have oppositely charged ions |
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What can ionic bonds conduct in? |
Water as a liquid |
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What is a covalent bond? |
Non metals sharing electrons to form a covalent bond |
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Why do covalent bonds have low boiling points? |
They have weak intermolecular force between the molecules |
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Why are covalent bonds strong? |
The bond in the molecules doesn't break |
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What kind of molecules are covalent bonds? |
Simple molecules |
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Why can't covalent bonds conduct? |
They are neutral |
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What is a giant covalent bond? |
Lots of covalent bonds in a structure |
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Why doesn't diamond conduct? |
There is no spare electrons |
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What kind of structure is a diamond? |
Tetrahedral |
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In a diamond how many covalent bonds are there to each atom? |
4 |
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Why does diamond have a high boiling point? |
There is lots of covalent bonds |
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What is diamond made of? |
Lots of carbon atoms |
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What kind of molecules are diamond and graphite known as? |
Macromolecular |
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Why does graphite only conduct one way? |
Because the electrons can only flow through it paralell |
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What forces are weak between graphite? |
Intermolecular |
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What kind of electrons does graphite have? |
Delocalised |
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Why does graphite conduct electricity? |
It has 3 covalent bonds to each atom |
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Why do layers slide over each other in graphite? |
It is in a hexagon layered structure which slide over each other because of weak intermolecular forces |
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What is graphite made of? |
Carbon atoms |
