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Chemistry
A Level

Explain in terms of bonding and structure the properties of graphite given that it is a good conductor, soft and has a very high melting point

It is a good conductor as there are delocalised electrons. It is soft as the layers are only held together by weak Van der Waals' forces so they can slide over one another. It has a high melting point as ...

Answered by Isabel C. Chemistry tutor
7838 Views

State and explain the general trend in first ionisation energy across Period 3

As you go across period 3 there is a general increase in the trend of the first ionisation energy. This is because the atoms have a greater charge on the nucleus (this means they have more protons). Howev...

Answered by Helen B. Chemistry tutor
7015 Views

Draw [Cu(H2O)6]2+ and explain why is it blue in colour.

[Cu(H2O)6]2+ is and octahedral shaped complex which I shall draw on the whiteboard.

It is blue for thw following reasons:

When the water ligands bond to the Cu2+ ion, it causes the d orbital...

Answered by Amaya J. Chemistry tutor
48950 Views

Explain what is meant by the term 'buffer solution' and give an example of a biological buffer system.

A buffer solution is a solution which resists changes in pH when small quantities of acid or alkali are added to it. An example of a biological buffer system would be the bicarbonate buffer system (regula...

Answered by Ruby B. Chemistry tutor
5780 Views

Calculate the pH change when water is added to 25.0 ml of 0.250M NaOH to form a 1.00l solution.

The initial [-OH] is 0.250M since NaOH releases 1 mole of -OH per mole of base. Using Kw=[H+][-OH], [H+]=(110-14)/0.250=410-14M (note remember units). Hence the initial pH=-...

Answered by Milind S. Chemistry tutor
14842 Views

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