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Describe the Structure and Bonding of Benzene

Benzene has the chemical formula C6H6 where each Carbon atom is bonded to two other Carbon atoms and a single Hydrogen atom. The 4th bond pair of electrons from each Carbon atom is delocalised, creating a de...
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Answered by Ben L. • Chemistry tutor
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How to choose a pH indicator for a titration?

Although it can seem a unusual question it simply requires to have understood the basis of a titration. First of all, what is a pH indicator? It is simply an acid-base compound whose acid and base form prese...
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Answered by Sarah M. • Chemistry tutor
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Explain in general terms what happens to a molecule when it absorbs a photon: (i) in the UV-visible region of the electromagnetic spectrum; (ii) in the microwave region of the electromagnetic spectrum

(i) In general, when a molecule absorbs a UV-visible photon, an electron is promoted from one of the occupied molecular orbitals to an unoccupied molecular orbital at higher energy. (ii) In general, when a m...
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Answered by Steven C. • Chemistry tutor
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Draw a dot and cross diagram to show HCl structure

I would first get the student to find the elements on the Periodic Table, and work out how many valence electrons each atom had. Then I would get them to draw the structures of hydrogen and chlorine using th...
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Answered by Sophie N. • Chemistry tutor
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Why do melting points decrease down the group 1 and increade down the group 7? (core syllabus: Periodicity)

Elements in the group one (i.e. alkali metals from lithium to francium) exhibit metallic bonding: the positive nuclei are held together thanks to the attraction to delocalised electrons. As the number of ele...
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Answered by Paulina M. • Chemistry tutor
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