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Chemistry
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Why is a benzene ring so stable (3 marks)?

The p orbitals on each carbon atom in benzene overlapThere is delocalisation of electrons in the ring (not 3 localised C==C double bonds)This makes benzene more thermodynamically stable than predictedIt t...

Answered by Aadil C. Chemistry tutor
2322 Views

How does pH relate to pKa?

pH measures the concentration of H+ (protons) in an aqueous solution. pKa

Answered by Charmaine W. Chemistry tutor
2313 Views

What are the reagents used to oxidise an alcohol to a carboxylic acid.

Answer: Sulphuric acid and potassium dichromate.

Answered by John A. Chemistry tutor
1476 Views

Describe the structure of an atom and an ion.

An atom consists of three sub-atomic components; protons, neutrons and electrons. The nucleus contains protons and neutrons. Electrons orbit the nucleus. Protons have a positive charge, electrons have a n...

Answered by Priya J. Chemistry tutor
5363 Views

What is the pH of a 25 ml sample of 0.2 M sulfuric acid? What is the pH after 5 ml of 0.25 M sodium hydroxide is added?

H2SO4 fully dissociates into ions (strong acid). It is diprotic therefore concentration of H+ ions is twice that of the acid = 0.4 M. pH = -log[H+] = -log[0.4] ...

Answered by George R. Chemistry tutor
2758 Views

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