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25 Cards in this Set
- Front
- Back
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Three states of matter |
Gas liquid solid |
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How are particles in a solid arranged |
Closely packed in a fixed arrangement and vibrate constantly |
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How are particles in a liquid arranged |
Close together random arrangement and can move around |
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How are particles in a gas arranged |
Much further apart, in a random arrangement move very quickly |
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When does a solid turn into a liquid |
At it's melting point |
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When does a liquid turn into a gas |
At it's boiling point |
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What happens when gas condenses |
It forms liquids |
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What happens when liquids freeze |
It forms solids |
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What is covalent bonding |
Non metals join together by sharing electrons |
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What is ionic bonding |
When positively charged ions form a bond with negative charged ions |
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How are ions held together in ionic bonding |
By strong electrostatic forces of attraction |
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When do ionic compounds conduct electricity |
When molten or dissolved in water |
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Why do ionic solids have high melting points |
Because it takes alit of energy to break the bonds |
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Why can ionic substances conduct electricity when molten or dissolved in water |
Their ions become mobile and can carry charge through the liquid |
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What are the limitations of dot and cross diagram |
They don't show the actual shape of the molecule |
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Which forces are broken when a small molecule melts |
Intermolecular forces |
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Why does sucrose not conduct electricity |
There is no overall charge in a compound |
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Why does diamond have a high melting point |
Because each atom is joined to other atoms by strong covalent bonds |
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Which element do all fullerenes contain |
Carbon |
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How are atoms arranged in a metal |
Arranged in regular patterns |
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Why are alloys often more useful than pure metals |
Because pure metal is too soft |
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Why are metals good conductors of electricity |
Because they are transferred quickly through the metallic structure by delocalized electrons |
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What is a nanoparticle |
Particles between 1 and 100nm in size |
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2 uses of nanotechnology |
Computers Medicine |
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2 possible risks of nanoparticles |
Lung inflammation Heart problems |
