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17 Cards in this Set
- Front
- Back
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What is covalent bonding?
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Where atoms share electrons
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What is the world's hydrosphere?
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All the water in the oceans, seas, lakes rivers etc.
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What is the lithosphere?
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The outer layer of the Earth, the crust and the top of the mantle
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What is the biosphere?
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Anything alive or that comes from living things
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What does electrolysis mean?
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Splitting up with electricity
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Why are most molecular substances gases?
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They have weak forces between molecules and so have low melting and boiling points.
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Why don't molecular compounds conduct electricity?
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Molecular compounds don't contain charges.
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Why can solid ionic compounds conduct when dissolved in water but not when solid?
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To conduct electricity the charges need to be able to move. This can happen when dissolved but not when solid.
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What type of structure does silicon dioxide have?
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Giant covalent
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What is an ore?
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A rock that contains metal.
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How much copper can be extracted from 800g of copper oxide (CuO)?
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639g
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Name a metal that can be extracted using carbon?
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Zinc, iron, tin or copper
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Why can't some metal oxides be reduced using carbon?
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They are more reactive than carbon
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During electrolysis where will metal form?
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At the cathode (negative electrode)
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What does reducing mean?
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Gaining electrons or losing oxygen
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What does oxidising mean?
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Losing electrons or gainin oxygen
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Why do metals conduct electricity?
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They have a sea of electrons that can move.
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