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Briefly describe the concept of electronegativity and explain why CCl4 is a non-polar molecule

Electronegativity is the tendency of an atom to attract a pair of electrons in a covalent bond. The Pauling scale assigns values to this tendency for each element in the periodic table ranging from the lowes...
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Answered by Samora S. • Chemistry tutor
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Please give the definition of Le Chatilier's principle. Use this to explain what would happen if you increased the temperature of an equilibrium in which the forwards reaction is exothermic.

Le Chatilier's principle states that, if a change is made to a system at equilibrium, the position of equilibrium will shift to oppose that change. If you increase the temperature of a system where the forwa...
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Answered by Sam W. • Chemistry tutor
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Differences between Sn1 and Sn2 reactions

--> Sn 2 : It is a one-step mechanism which is considered to be Sn 2 where two species are involved in the rate determining step. Both species account for the overall rate of the reaction where the rate e...
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Answered by Lucy S. • Chemistry tutor
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I don't understand why carbon forms 4 bonds but nitrogen doesn't form 5.

Carbon has 4 electrons in its outer shell, a pair in the 2s and two unpaired electrons in the 2p. For covalent bonds to form, each atom must donate one unpaired electron. Carbon makes four bonds because it c...
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Answered by Ryan H. • Chemistry tutor
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Elements in the periodic table show a trend in atomic radius. State and explain the trend in atomic radius from Li to F.

The atomic radii of an atom is essentially the distance from the centre of the nucleus to the outer shell of electrons- so atoms that are very small and have a small distance from the nucleus to the outer sh...
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Answered by Demi S. • Chemistry tutor
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