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Scientists have squeezed diamonds into an even harder material
Diamond is one of the hardest materials known to man, but experts think it can be squashed into something even harder. The ...
BBC4y
Polar and non-polar molecules
This is due to the shape of the molecule ... Carbon tetrachloride has four polar covalent bonds. It is a tetrahedral molecule, so the charges are symmetrical. The \(\delta+\) part of the molecule ...