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9 Cards in this Set
- Front
- Back
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covalent bonds.. |
sharing a pair of electrons |
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simple molecular covalent substances.. |
very strong covalent bonds, to form small molecules. Forces of attraction are very weak. Inter-molecular forces - melting and boiling points are very low = easily parted from each other |
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giant covalent substances.. |
all atoms bonded together by strong covalent bonds. VERY high melting and boiling points |
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what is the hardest natural substance.. |
a diamond. Four covalent bonds = very hard |
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graphite is a good conductor of electricity.. |
three covalent bonds, sheets of carbon atoms - useful lubricant |
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what does missable mean? |
mixes with the other liquid e.g.. milk with your tea |
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imissable.. |
wouldn't mix probably = e.g. water and oil, the oil lays on the top as it is less denser. The water which is denser would be at the bottom |
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fractional distillation separates out missable liquids.. |
they must have different boiling points - the mixtures will condense at different temperature |
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what can chromatography be used for... |
identify substances that have the same composition than other mixtures |
