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Chemistry
A Level

Why is phenol more easily nitrated than Benzene?

This is due to the -OH phenol functional group, which makes nitrating the molecule easier. Benzene has a delocalised pi-system above and below the plane of the molecule. The result of this is that: it is ...

Answered by George W. Chemistry tutor
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Describe and explain the structure of Benzene

Benzene has a planar structure with a bond angle of 120. The bonds between the carbon atoms in the ring are identical in strength and length. The length of the carbon-carbon bonds in benzene is intermedia...

Answered by Chemistry tutor
1804 Views

An iron-alloy nail (2.41g) is dissolved in 100cm3 acid. 10cm3 portions of this solution are titrated with KMnO4 (0.02M) and 9.80cm3 of KMnO4 was needed to react with iron solution. What % of iron by mass is in the nail?

This is a common example of a titration calculation which can be broken down into several key steps:1) Write a balanced equation for the redox reaction:MnO4 - + 8H+ + 5Fe2+ --> Mn2+ + 4H2O + 5Fe3+(This...

Answered by Amy C. Chemistry tutor
4001 Views

What are the three pieces of evidence that disprove the Kekulé model of Benzene?

The enthalpy change of hydrogenation is less exothermic than suggested by the Kekulé model ( -208kJmol-1 instead of the expected -357kJmol-1), meaning Benzene is more thermodynamical...

Answered by Chemistry tutor
4542 Views

There are two stable isotopes of Bromine, Br-79, Br-81. If a sample of Br2 is fed into a mass spectrometer, how many peaks would be observed in the spectrum?

There should be five peaks. In the process of bombarding the Br2 molecule with electrons to charge it, the molecule can fragment into 2 Br atoms. We should therefore expect to see peaks at 79 and 81 m/z. ...

Answered by Tim H. Chemistry tutor
10400 Views

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