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...Multiple bonds - So far, any two atoms in the Lewis structures you have looked at have been held together by just one electron pair bond. Logically this is called a single bond. But sometimes two or even three shared pairs may be involved, two examples are shown in Figure 1, however the name of the game is still the attainment of eight outer electrons. [Described image]...

...Multiple hydrogen bonds together exert a considerable force that can exceed the strength of the bonds between sodium and chlorine in sodium chloride. This separates them, dissolving the crystal into the water. This dissociation is also the reason why even tap water contains numerous dissolved ions, such as magnesium, potassium, sodium, calcium, chloride and fluoride....

...multiples of ten. Before this, people measured things in many different ways and this caused confusion and mistakes. For example, the ways of measuring length were most commonly based on things which come to hand; there were hands, spans, feet, inches, yards, chains, furlongs, miles, leagues, fathoms, cables, links and rods. While these measurements are easy to use at one...