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Chemistry
A Level

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 lo...

Answered by Samora S. Chemistry tutor
20193 Views

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 fo...

Answered by Sam W. Chemistry tutor
2086 Views

Differences between Sn1 and Sn2 reactions

--> Sn2

It is a one-step mechanism which is considered to be Sn2 where two species are involved in the rate determining step. Both species...

Answered by Lucy S. Chemistry tutor
3433 Views

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 i...

Answered by Ryan H. Chemistry tutor
8991 Views

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...

Answered by Demi S. Chemistry tutor
8479 Views

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