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maybe because you don't need to study anymore, and you're dead sure you'll get 100

Yeh, or just use (1+x)^n and sub x=-1 as the q asked. Either way is good.

Yes, that's what we've been saying - draw the lewis structure, note the lone pair, and it must be polar.

Yep, one of the characteristics of transition metals is that they have a number of valences. The +2 state is a safe bet given that the 4s electrons are generally lost. Apart from this, it is best to memorise the valences for the transition metals. There are patterns associated with what type of...

The alkali metals are those in group 1 of the periodic table - sodium, potassium, rubidium, caesium, francium.

Revenge Tragedy is actually a good genre to do. It's more rewarding than crime fiction, which is just about as formulaic as it gets. We did Revnegr's Tragedy, High Noon and Medea as well, and they're all good texts. You also get to use good extra texts as well - eg godfather, kill bill etc.

Xayma, the polarity is a result of a lone pair on the central oxygen atom - each oxygen atom has 8 electrons around them, in accordance with the octet rule, and this means that the central oxygen atom must have a lone pair, given that there are basically "1.5 bonds" between the oxygen atoms (ie...

Ozone is polar. Draw out its Lewis structure, and you'll notice the lone pair of electrons on the central oxygen atom. This gives the polarity, as electron density is greatly increased in the direction of the lone pair - ie there is a permanent dipole associated with the ozone molecule. The...

Even then, motion isn't as much of a nasty bash as conics can be...all these cos's, sec's, sin's, tan's half angles etc all over the place. And a lot of tangent, chord expressions. Motion is just about a bit of integration in this course anyway. Volumes and random fractions can be a pain at times.

/z/ >= 0 as it is a distance. Hence y is also >= 0

2.) Ozone isn't stable enough to exist at higher gas pressures (ie concentrations) in lower layers. In the stratosphere, it is decomposed by uv radiation, cfcs etc. Hence it has its highest conc in the stratosphere.

As Xayma pointed out, allotropes have different physical properties and can have remarkably different chemical properties - take diamond and graphite. Graphite can be reacted with nitric acid to form benzene and its derivatives, while diamond can not undergo these sorts of rxns at all. Even...

It is QMOT, which superceded the valence bond model that explains paramagnetism. VB theory can not determine accurately whether a substance is paramagnetic...liquid oxygen is the best example for this. Certainly, there are instances in which simply listing the d-orbitals and s and p orbitals...

Cameron, I don't think the VB model allows you to predict magnetisation. VB is good for the structures, but the problem is, it's far too complicated and ungainly to deal effectively with - ie its just not general enough...(just an example: sp3d hybridisation - trigonal bipyramidal structure -...

Meh...Cardan Polynomials...brings back bad memories of a JL Williams comp a couple of years ago.

weetbix with milk: 15 in a day weetbix without milk: 5 in an hour...that stuff dries you up very quickly...

that's simply integral of e^u.du/dx, where u =1/x

If you're accounting for linearity for HDPE, then all you need to do is talk about the rxn as occuring on the surface of the catalyst, while backbiting occurs in the polymerization of ethene to LDPE. As for the organic peroxide (eg benzoyl peroxide), it will certainly be contained in the...

Yep, they told us theyd knock after half-an-hour, so it wasn't really a "dirty trick", and anyway i didn't hear it, so it didn't matter at all...

Basically every one of our last couple of school 3 unit maths exams has had a projectile motion inequality involving use of the discriminant. So, as far as we're concerned, it's rather useful...