Top answers

Chemistry
A Level

How do you convert between different SI units, for example, nmol to mmol?

Convert 560nmol to mmol. 1) nmol – 10-9 --> mmol – 10-3 2) L <--  S (Large goes on the left) 3) Bounce decimal point to the l...

JP
3568 Views

Why is ethylamine a stronger base than phenylamine?

A base is a proton acceptor. 

Amines work as bases due to the electronegativity of the nitrogen atom. The lone pair in the nitrogen atom is filled in a 2p(z) orbital, in phenylamine, the p orbital ...

AM
Answered by Adhib M. Chemistry tutor
8757 Views

Explain how chromatography is used to separate components in a mixture.

Chromatography separates components in a mixture according to their solubility in the mobile phase and their adsobance to the stationary phase. The mobile phase is the part of the chromatography set up th...

IC
Answered by Immy C. Chemistry tutor
18862 Views

Flask Q (volume = 1.00 x 103 cm3 ) is filled with ammonia (NH3) at 102 kPa and 300 K. The tap is closed and there is a vacuum in flask P. (Gas constant R = 8.31 J K−1 mol−1 ) Calculate the mass of ammonia

This question can be solved using the ideal gas equation, given by: PV=nRT 

Rearranging the ideal gas equation gives an expression for the number of moles as

n=PV/RT 

Subbing the valu...

SD
6791 Views

What is the difference between stereoisomerism and optical isomerism?

Isomers are compounds with the same molecular formula but different arrangement of atoms in space (or structural formula). Stereoisomers (E/Z isomers) have different arangements of bonds ...

LI
Answered by Lara I. Chemistry tutor
13040 Views

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