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What's the difference between 'por' and 'para'?

'Por' and 'para' convey very different meanings in Spanish and using one instead of the other can change the whole meaning of the phrase. For example:- Trabaja para Carmen - She works for Carmen (i.e. Carmen...
GP
Answered by Genevieve P. • Spanish tutor
4787 Views

What are the stereochemical implications of bimolecular and unimolecular nucleophilic substitution?

If a chiral molecules undergoes nucleophilic substitution what happens to its stereochemistry? S N 1: These reactions occur with the production of a cationic intermediate. These contain an sp 2 hybrdised car...
HS
Answered by Henry S. • Chemistry tutor
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Why are solutions of transition metal ions often coloured

Transition metal ions have, by definition, at least one partly filled d orbital (eg:3d). When in a solution, the positive charge of the transition metal ions can cause the lone elctron pairs of other molecul...
SA
Answered by Stuart A. • Chemistry tutor
8279 Views

What is the ideal gas equation?

The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas. The terms are: p = pressure, in pascals (Pa). V = volume, in m 3 . n =...
JC
Answered by Jeremy C. • Chemistry tutor
89994 Views

How do you factorise a quadratic equation?

If you are given a simple quadratic equation, for example x 2 +6x+8=0, then in order to factorise this you must find two numbers that add together to make the coefficient of x in the equation (in this case t...
ER
Answered by Erin R. • Maths tutor
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