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How do you write a coherent and skilled introduction?

Writing an excellent essay, whilst naturally requiring good and convincing prose, is actually quite the regimented science. A good essay 'formula' will consist of the same kind of points and argument styles ...
LM
Answered by Luke M. • History tutor
6534 Views

Can you explain what stoichometry actually is and why the ratio is not the same as the number of moles?

Stoichiometry is just a way of relating two species that react, in a ratio. EXAMPLE: 1A + 2B -> 3C Now usually this would be written as A + 2B -> 3C but I've written the 1 to exaggerate the point. Now ...
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Answered by Michael R. • Chemistry tutor
6519 Views

The roots of the equation z^3 + 2z^2 +3z - 4 = 0, are a, b and c . Show that a^2 + b^2 +c^2 = -2

If the roots of this cubic equation are a, b and c, then the equation can be written(z - a)(z - b)(z - c) = 0multiplying this out gives:z^3 - az^2 - bz^2 - cz^2 + abz + acz + bcz - abcgrouping terms with z t...
EH
7436 Views

How do you order pronouns in the affirmative imperative in French?

The imperative mood is used when giving commands to a number of persons : either the 2nd person singular 'tu', the 1st person plural 'nous' or the 2nd person plural 'vous'. Whilst negative constructions of t...
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Answered by Lauren R. • French tutor
8865 Views

What is meant by an excited atom?

All that is meant by an 'excited' atom is that one or more of the atoms electrons in it's shells, are then excited into shells that are in higher energy states that they were in before. Furthermore, electron...
RW
Answered by Rebecca W. • Physics tutor
16229 Views