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Chemistry
A Level

What are buffers and how do they work?

Buffers are solutions of acid and base which work to minimise changes in pH following the addition of small amounts of acid or base. Ideal buffers are made of a weak acid (i.e. one which does not fully di...

Answered by Samuel J. Chemistry tutor
6820 Views

Which compound has a higher boiling point and why: water (H2O) or methane (CH4)?

Water has a higher boiling point because the hydrogen bonds that form among water molecules are stronger than the Van der Waals interactions among methane molecules, thus more energy must be provided in o...

Answered by Maria D. Chemistry tutor
36953 Views

In terms of the structure and boiling point of graphite, explain why the melting point is high

Each carbon atom in graphite is bonded to three other carbon atoms. These carbon atoms are linked by covalent bonds - which are very strong. Graphite is arranged in sheet like structures and between each ...

Answered by Tinashe M. Chemistry tutor
40638 Views

Nitric acid (HNO3) is a strong acid. Ethanoic acid (CH3COOH) is a weak acid. Write an equation to show how ethanoic acid behaves as a weak acid in its reaction with water.

CH3COOH + H2O ⇌ CH3COO– + H3O+

Answered by Jigi M. Chemistry tutor
25120 Views

How does the mechanism for electrophilic addition work?

First we must consider what an elecrophile is. An electrophile is a molecule or ion which is attracted to (and accepts electrons from) electron dense regions in other molecules, because it is positively c...

Answered by Akalanka R. Chemistry tutor
7582 Views

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