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Chemistry
A Level

What is clonal selection?

Clonal selection is a part of human immune response where specific B or T-helper lymphocytes are chosen to undergo clonal expansion

B-lymphocytes and T-helper lym...

OM
Answered by Oliver M. Chemistry tutor
43402 Views

What is the rate-determining step?

The rate-determining step is simply the slowest step in a reaction mechanism of a multi-step reaction. 

Most reactions do not happen in one simple step. You may be familiar with overall r...

CK
2295 Views

How to formulate and balance a redox equation under acidic conditions

In a reaction between  MnO4- and Fe2+ we are told MnO4- goes to Mn2+ and Fe2+ goes to Fe3+. We then need to derive t...

KD
Answered by Kiera D. Chemistry tutor
2702 Views

Why do ionisation energies increase across a period?

It's experimentally observed that ionisation energies have a general increase as one moves across the period: the first ionisation energy of lithium is ~500 kJ mol‑1, whereas that of n...

TD
Answered by Tom D. Chemistry tutor
9788 Views

What's the difference between Aliphatic and Aromatic Molecules?

Aromatic compounds contain a ring-structre e.g. Benzene whereas Aliphatic molecules have a straight chain structure e.g. Butane.

RW
Answered by Ruth W. Chemistry tutor
5944 Views

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