GCSEs

[ralphchadkirk]

Science was definitely my favourite (and best!) subject. I've continued it to AS, will be taking Biology onto A2, and hopefully a form of science at degree level.

 

[Class172]

Science was definitely my favourite (and best!) subject. I've continued it to AS, will be taking Biology onto A2, and hopefully a form of science at degree level.

I love all three sciences, as well as being really good at them. In chemistry my teacher gives me an AS paper to look at if I finish work really early in the lesson and I can answer quite a few questions (whether they're right or no that's another thing!).

Obviously I am taking all three sciences for GCSE and I'm also taking Astronomy.

Random chemical formula of the day: try and work out what it is. (sorry there is no subscript on these forums so I've had to use superscript

C[SUP]6[/SUP]H[SUP]2[/SUP](NO[SUP]2[/SUP])[SUP]3[/SUP]CH[SUP]3[/SUP]

 

[ralphchadkirk]

2,4,6-trinitrotoluene - sorry, I've used that formula before!

(TNT for the non-Chemists!)

 

[Class172]

2,4,6-trinitrotoluene - sorry, I've used that formula before!

(TNT for the non-Chemists!)

Darn you! I'll have to think of a harder one!

 

[SS4]

darn you! I'll have to think of a harder one!

H3C       CH3
   \     /  
    C = C
   /     \
  H       H


<this has nothing to do with the original code, but is here to keep the rendering in place>

A harder one is C6H4(OH)COOH (the C6 does form a benzene ring)

 

[Class172]

H3C       CH3
   \     /  
    C = C
   /     \
  H       H


<this has nothing to do with the original code, but is here to keep the rendering in place>

Well it is clearly an isomer of butene and has the 'cis' form - cis-2-butene

A harder one is C6H4(OH)COOH (the C6 does form a benzene ring)

Benzene ring + Hydroxy group + Carboxyl group = acid of some sort…. Seems like a fatty acid possibly. Salicylic Acid? Only because it's the only one I can think of that has a benzene ring)

 

[ralphchadkirk]

Blimey, class172, you basically are at AS Level if you understand benzine rings and E/Z isomers!

 

[Class172]

Blimey, class172, you basically are at AS Level if you understand benzine rings and E/Z isomers!

And I know Ketones and Aldehydes too, along with some other things.

Also, call me Dan

 

[SS4]

Well it is clearly an isomer of butene and has the 'cis' form - cis-2-butene

Benzene ring + Hydroxy group + Carboxyl group = acid of some sort…. Seems like a fatty acid possibly. Salicylic Acid? Only because it's the only one I can think of that has a benzene ring)

Gordon Bennett, you're good. I had to look salicylic acid up

 

[Class172]

Gordon Bennett, you're good. I had to look salicylic acid up

Salicylic acid is the only fatty acid I know so that did help!

 

[MidnightFlyer]

I know what you mean, some people's English is let's say, not that good.

I start my GCSEs next year too (just trying to think what year I am in as my school has this really odd year system - Lower Removes = Y9). As for English as a subject, I loathe it! Too much 'analyse this text' and 'pick out the literary devices used.' It's so dull

My English teacher was the only reason I took such an interest in English!

 

[mbonwick]

Next Chemistry lesson...pH calculations and Redox

 

[Nym]

2,4,6-trinitrotoluene - sorry, I've used that formula before!

(TNT for the non-Chemists!)

Where does it say that it's 2,4,6-TNT, it could be 2,4,5-TNT from only having the systematic formula....

We made TNT in A Level Chemistry, wern't allowed to, we wern't allowed to make detonators in electronics either, nor where we allowed to go and blow a big hole in the sports feild under the advice of how to do so from our Physics tutor.

Learning was more fun at college...
--- old post above --- --- new post below ---

Next Chemistry lesson...pH calculations and Redox

Shame, I can only really teach, maths, physics and electronics. Chemistry isn't my trade really.

The way I'd be spesific for TNT would be
C6{CH3,NO2,H,NO2,H,NO2}
In my mind that spesifically says 2,4,6-trinitrotolurine


How about the common name, and use for (5α,6α)-7,8-didehydro-4,5-epoxy-3-methoxy-17-methylmorphinan-6-ol ?

 

[Class172]

Where does it say that it's 2,4,6-TNT, it could be 2,4,5-TNT from only having the systematic formula....

I don't know whether it could form that isomer but if it does TNT is probably referred to as the 2,4,6 variant as it is the most widely recognised? I may be wrong.

 

[Nym]

2,4,6 is the most common isomer that is formed, but when you make TNT in a lab, you get about 88% 2,4,6 IIRC and you need to very carfully distill away the inproperly formed isomers. And the incompletly formed or over formed nito, dinitro, quad and quin-nitro tolurines.

You can leave these in, but it makes it much less effective, and means that when you come to blow somthing up and they test to see what it is that has done it, they can easilly tell that it's been home made. This is why quite a lot of pepole are shying away from the easy to make TNT now and moving on to either RDX, or in some cased PETN, but if you don't make PETN properly, it just fizzes, melts through your bag, and causes an evacuation of a tube train.

And I'm not doing bad considering the last time I touched chemistry was in 2006...

 

[Class172]

How about the common name, and use for (5α,6α)-7,8-didehydro-4,5-epoxy-3-methoxy-17-methylmorphinan-6-ol ?

What the?!?!? Well morphine comes to mind as it has 'morphinian' in it but I don't have a clue otherwise - if it is then it's a painkiller

 

[Nym]

It's Codeine... Was just be being evil because it's one of the things that I happen to know. But it only has a half life of about 3 hours unless you combine it with a phosphate salt, or hydrate it.

Like I said, not a chemist... I'm actually an Engineer by trade.

I'm just looking at a 2nd year maths exam (UMIST Engineeering Mathematics), and you should actually be able to awnser part of it at GCSE level, do you still do Simpsons Rule and the Compisite Trapisoidal rule for approximating intergrals?

I know we touched on it in GCSE Maths (AQA Higher) when I did it all those years ago, we definatly did it in A level maths.

 

[Class172]

At least I was in the right sort of area with medicinal drugs.

No I haven't done those mathematical things yet, they might be next year (and I'm in top set) so we mustn't be that far away.

 

[Nym]

It will probably be introduced as "Finding the area under a graph"

I know they've reduced the amount of pure theory, but for definate you will see it at A Level in Core 2 I belive (It used to be in Methods)

And the trapisoidal rule is easy... add together trapisoids

 

[OxtedL]

Depends which board, but broadly speaking, Trapezium rule is AS whilst Simpson's is A2. Simpson's is far more exciting.

 

[Nym]

I didn't mention some of the really exciting ways to solve nth order differential equations...

 

[OxtedL]

Which I believe you only get to do up to 2nd degree at A level, and only then if you're the kind of mega-brain who sits Further Maths A2. (FP3 currently for OCR A2, I think...)

 

[Nym]

I did do FP2 and FP4...

Two maths A levels, get in! But yeah, this is UMIST Mathematics for Engineers...

 

[MidnightFlyer]

Results day tomorrow, God am I nervous!

 

[newbie babs]

Good luck to all those receiving exams results tomorrow, my daughter got her A levels last week and I know how it feels as I did mine the year before.

GOOD LUCK

 

[theblackwatch]

Results day tomorrow, God am I nervous!

Don't forget to post your results here (that applies to anyone else too). Hope they're as good as (or better than) you expected.

 

[Crossover]

Good luck all

 

[thefab444]

Good luck all with GCSE results. Suprised we didn't have a thread about A level results last week.

my daughter got her A levels last week and I know how it feels as I did mine the year before.

Have I missed something, or are you saying you were 1 year old when you had your daughter?

 

[MCR247]

Can you do A Levels when you're older? :?

Glad I've still got 2 years till I have to go through this

 

[Lampshade]

Good luck to anyone getting their GCSEs tomorrow!

I remember the night before my results day in 2006, didn't sleep at all hock: