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Chemistry
A Level

Calculate the empirical and molecular formula of unknown compound A which gave an m/z of 181 in the mass spectrum for the molecular ion peak. Elemental analysis by combustion shows the compound is C 53%, O 35.4%, H 3.9% and N 7.7%.

C atomic mass-12 C percentage by composition: 53% Atomic ratio of C: 53/12= 4.417 H atomic mass-1 H percentage by composition: 3.9% Atomic ratio of H:...

Answered by Aminat S. Chemistry tutor
3058 Views

Explain why Xenon had a lower first ionisation enthalpy than Neon. (3 marks)

Xenon is further down Group 8 of the Periodic Table than Neon, hence has its outermost electrons in higher energy shells further away from the nucleus. Therefore, there are more full inte...

Answered by Alex M. Chemistry tutor
9003 Views

How would you find out whether a reaction is feasible?

For a reaction to be feasible at a given temperature, it must happen spontaneously, which means no extra energy needs to be put in for the reaction to occur. To find out whether a reaction is feasible, yo...

Answered by Sarah G. Chemistry tutor
60439 Views

Explain why Scandium is not considered a true transition metal.

By definition, to be a transition metal, is a d block metal, which forms at least one stable ion, with a partially filled 3d shell.
Scandium has one stable ion, Sc3+, which posses no 3d o...

Answered by Joe P. Chemistry tutor
5080 Views

How does increasing the temperature affect the yield of products of a reaction at equilibrium, where the forward reaction is exothermic?

The position of equilibrium changes after the temperature increases according to Le Chatelier's principle, which states that if a change is applied to a system in equilibrium, then the position of equilib...

Answered by Jessamy R. Chemistry tutor
28172 Views

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