i thought i'd make this thread as i'm hoping that it would help each and every GCSE student that is a member of this forum (and possibly even people who aren't members of this forum).
here, you can post anything that you've learnt today...bearing in min that this is a science and maths thread ONLY...i dont want to see posts regarding the climate or the nazis. this can aso be regarded as a thread where you can ask questions that you do not know the answer to or even quiz each other.
but...as quite a lot of threads, this thread requires you to sign a set of rules.
no googling the answer, copying and pasting...feel free to research the topic, make notes...and then come back to answer...that is once you know that you have learnt the topic well.
no off-topic posting (duh!)
if you are a non GCSE student willing to help us poor enslaved students, feel free to do so.
you can only post an answer to a question if you are a GCSE student...but anyone (even if you are not a GCSE student) can ask GCSE science or maths related questions.
*hmm...i think there were more rules...but i've forgotten them...so that's it for now*
this thread can also be used as an excuse as to why you are being online when you are supposed to be revising for your exams...but if the excuse doesn't work, i am not to blame...*i know, i never was a good influence on kids*
first question (as today, i didnt learn anything in school cause i wasnt bothered)...
1. What are the three different types of rocks? Examples for each of the types.
2. Two types of igneous rocks and one example for each type.
***** قال ابن أبي مليكة : أدركت ثلاثين من أصحاب النبي - صلى الله عليه وسلم - كلهم يخاف النفاق على نفسه
Ibn Abī Mulaykah said: "I encountered thirty Companions of the Prophet, every one of them fearing hypocrisy for himself." [Muslim]
i dont know what quadratics mean...so i just went with what i thought was right; thus:
6x^2 - 3x + 4x - 2 = 3
6x^2 + x -2 -3
6x^2 + x -5
So far correct....
then if you factorize: (6x - 5)(x + 1)= 0
either: (6x - 5)=0 or (x + 1)= 0
so: 6x = 5 or x = -1
therefore the two solutions are: x = 5/6 or -1
dont know if i explained properly but thats that
***** قال ابن أبي مليكة : أدركت ثلاثين من أصحاب النبي - صلى الله عليه وسلم - كلهم يخاف النفاق على نفسه
Ibn Abī Mulaykah said: "I encountered thirty Companions of the Prophet, every one of them fearing hypocrisy for himself." [Muslim]
***** قال ابن أبي مليكة : أدركت ثلاثين من أصحاب النبي - صلى الله عليه وسلم - كلهم يخاف النفاق على نفسه
Ibn Abī Mulaykah said: "I encountered thirty Companions of the Prophet, every one of them fearing hypocrisy for himself." [Muslim]
He helium The gas is much less dense than air (lighter) and is used in balloons and 'airships'. Because of its inertness it doesn't burn in air UNLIKE hydrogen which used to be used in large balloons with 'flammable' consequences e.g. like the R101 airship disaster! Helium is also used in gas mixtures for deep-sea divers.
Ne neon just like this website! Neon gives out light when high voltage electricity is passed through it, so its used in glowing 'neon' advertising signs and fluorescent lights.
Ar argon Argon, like all the Noble Gases is chemically inert. It used in filament bulbs because the metal filament will not burn in Argon and it reduces evaporation of the metal filament. It is also used to produce an inert atmosphere in high temperature metallurgical processes, eg in welding where it reduces brittle oxide formation reducing the weld quality. Its bubbles are used to stir mixtures in steel production. Argon is the cheapest to produce.
Kr krypton Not used by superman! BUT is used in fluorescent bulbs, flash bulbs and laser beams.
Last edited by 786rani; 04-04-2007 at 09:19 PM.
:: = Fitnah
: = Fitnah kay: = Fitnah x 2
Do we wink or act playfully with the opposite gender in in real life interaction? No (I hope). So behave modestly towards the opposite gender in your posts as well.
***** قال ابن أبي مليكة : أدركت ثلاثين من أصحاب النبي - صلى الله عليه وسلم - كلهم يخاف النفاق على نفسه
Ibn Abī Mulaykah said: "I encountered thirty Companions of the Prophet, every one of them fearing hypocrisy for himself." [Muslim]
Polymerisation? All that alkanes and alkenes stuff! :S
ok...bear with me cause i really have hard time explaining since its all recalling from memory.
ok so...alkanes are saturated and alkenes are unsaturated...to be honest, i dont really now what each of that means but i only know that. they are both from the family of hydrocarons. the first 4 alkanes are methane CH4, ethane C2H6, propane C3H8 and butane C5H12. the formula to find the H for alkanes is CnH(2n+2)...now onto the alkenes. alkenes are usually carbon carbon double bond. and the stuff is usually spelt with an 'e' where the 'a' is. eg. instead of ethane, it is ethene. the formula to find the H in alkenes is CnH(2n). eg. ethene C2H4 and propene C3H6. the test for alkenes and alkanes is the bromine water thingamajig. alkenes turn bromine water (a brown colour solution ) colourless.
polymerisation...
there are monomers and polymers...you ought to know the difference between the two. a monomer is a simple molecule eg. C2H4...a polymer is a large molecules formed from simple smal molecules...i dont have an example...cause i cant remember one
and i think...if i remember correctly...only alkenes can polymerise this is because of their double bond. polymerisation is when lots of small molecules join together end to end to form a large one. these are called addtion polymers. eg. ethene...lots of ethene = poly ethene, propene...lots of propene = polypropene.
i did a google search nd found a perfect image explaining what i just said above:
the 'part of a polyethene molecule' can also be drawn like this:
Insulin is a hormone that regulates the amount of glucose (sugar) in the blood and is required for the body to function normally. Insulin is produced by cells in the pancreas, called the islets of Langerhans. These cells continuously release a small amount of insulin into the body, but they release surges of the hormone in response to a rise in the blood glucose level.
my 10 yr old sister has diabetes she should know.
rani
:: = Fitnah
: = Fitnah kay: = Fitnah x 2
Do we wink or act playfully with the opposite gender in in real life interaction? No (I hope). So behave modestly towards the opposite gender in your posts as well.
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= Fitnah
kay: = Fitnah x 2 
) colourless.
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