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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). However,...
HB
Answered by Helen B. • Chemistry tutor
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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 orbitals to split into 2...
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Answered by Amaya J. • Chemistry tutor
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What is a catalyst?

A catalyst is something that changes the rate of a chemical reaction, without being used up during it. A catalyst provides a different reaction pathway, which requires a lower activation energy than the orig...
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Answered by Ryan F. • Chemistry tutor
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How would you expect calcium carbonate to react with hydrochloric acid?

The chemical equation is as follows: CaCO 3(s) +2HCl (aq) --->CO 2(g) +H 2 O(l)+CaCl 2(aq) The general formula for an acid reacting with a carbonate is: Carbonate+Acid--->Carbon dioxide+Water+Salt Thes...
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Answered by Annie H. • Chemistry tutor
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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 (regulates...
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Answered by Ruby B. • Chemistry tutor
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