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Chemistry
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How does the structure of benzene differ from the pre-assumed structure of 1,3,5-cyclohexatriene? *Kekule's structure*

(drawing of the two) There are three main ways that we can tell the correct structure of benzene consists of a delocalised ring. They are:

  • the delocalised structure is more stable that the pr...
FN
Answered by Freya N. Chemistry tutor
9079 Views

Why does reacting a bromoalkane with ammonia result in a quaternary ammonium salt and not an amine?

To explain this question let us use an example of reacting Bromoethane (CH3CH2Br) with ammonia (NH3). As bromine is more electronegative than carbon (electronegativity being the ability of an element to a...

HD
Answered by Henry D. Chemistry tutor
3919 Views

You have 3.51g of hydrated zinc sulphate. You heat up the zinc sulphate until all the water has evaporated from it. The weight after heating is 1.97g. Find how many H2O molecules per zinc sulphate molecule there are in the hydrated form of it.

  1. Write down the equation: ZnSO4xH2O --> ZnSO4 + xH2O 2. Calculate the masses: 3.51g --> 1.97g + 1.54g 3. Calculate the number of moles, using the molar mass of water and zinc sulphate: 1.97g = ...
OS
Answered by Olivier S. Chemistry tutor
21190 Views

What is entropy and how is it used in chemistry?

Entropy (S) is a measure of disorder in a system. Any process, in this case a chemical reaction, is said to entropically favoured if the overall disorder in the system increases. This is usually when ther...

KS
Answered by Kashf S. Chemistry tutor
2519 Views

How and why does atomic radius vary in the periodic table?

Atomic radius increases down a group in the periodic table. This can be explained by a phenomenon called electron shielding. As the number of electron shells is increased down the group, the attraction be...

CS
Answered by Craig S. Chemistry tutor
4365 Views

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