Chem Question
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In extraction of metals, why do the waste gases contain sulphur dioxide and nitrogen...
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There are many impurities in the Coke(Carbon).
That why when during extraction of metal using Coke, these impurities react with the oxygen and become these gases.
Sulphur + Oxygen --> Sulphur Dioxide.
Same for others impurities.
Iron ores also contain impurites. Common iron ores come in the form of Haematite. While other may come in FeS2 or CuFeS2 etc. -
Woah, darkie still can rmb ar.Originally posted by Darkness_hacker99:There are many impurities in the Coke(Carbon).
That why when during extraction of metal using Coke, these impurities react with the oxygen and become these gases.
Sulphur + Oxygen --> Sulphur Dioxide.
Same for others impurities.
Iron ores also contain impurites. Common iron ores come in the form of Haematite. While other may come in FeS2 or CuFeS2 etc.
/thumbs up
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Impurities!!!
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Originally posted by TrixCereals:Woah, darkie still can rmb ar.
/thumbs up 
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i tot he saying general metals...lol...then will b quite wierd coz different metals got different way of extracting...like gold n silver exist in pure states...Originally posted by Darkness_hacker99:There are many impurities in the Coke(Carbon).
That why when during extraction of metal using Coke, these impurities react with the oxygen and become these gases.
Sulphur + Oxygen --> Sulphur Dioxide.
Same for others impurities.
Iron ores also contain impurites. Common iron ores come in the form of Haematite. While other may come in FeS2 or CuFeS2 etc. -
Metals high up in the reactivity series requires electrolysis to extracts from its ore. Yes, extraction of metal using electrolysis also realease gases such as Carbon Dioxide, Carbon Monoxide and Fluorine( and fluorine compounds) etc.Originally posted by darkhour:i tot he saying general metals...lol...then will b quite wierd coz different metals got different way of extracting...like gold n silver exist in pure states...
But when talk about sulphur dioxide, I immediately linked it to extraction of metals using Coke.
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Depends on what you extract.
Sulphur dioxide because sulphur is quite common in metal ores.
Carbon monoxide and carbon dioxide because some impure graphite may exist in metal ores. Combustion will produce the above 2 gases. -
for coke, CO and CO2 are produced. CO2 is when there is sufficient O2 in the atmosphere. when there is insufficient O2 CO is produced instead. same as cars. Co2/co is produced in extraction of coke and aluminium(anode).
for sulphur. coke has 2% sulphur if i remember correctly. -
Help..i was reading through my guide book..then i saw this point:
Alkanes
Alkanes have only carbon-carbon single bonds.(C-C) Each carbon atom has 4 single covalent bonds, which it uses to form bonds tp carbon or hydrogen atoms.
1st Qn: Why are the carbon single bonded?Single bond means share a pair of electrons right
2nd Qn:Wad do they mean by 4 single covalent bonds??? -
Since you seem to be taking o lvl this year, I shall just keep it at that for my answer.Originally posted by lpx88:Help..i was reading through my guide book..then i saw this point:
Alkanes
Alkanes have only carbon-carbon single bonds.(C-C) Each carbon atom has 4 single covalent bonds, which it uses to form bonds tp carbon or hydrogen atoms.
1st Qn: Why are the carbon single bonded?Single bond means share a pair of electrons right
2nd Qn:Wad do they mean by 4 single covalent bonds???
1) Why are the carbon single bonded? Well carbon is an amazing element since it is in group 4. This means it has 4 valence electrons. It can opt to form single, double or even triple bonds with other elements. It does not form quadruple bonds with other elements though.
As to why the carbon atoms are singly bonded in alkanes, well alkanes are special because they are known as unsaturated compounds and in unsaturated compounds only single bonds exist in contrast to that of alkenes where double C=C bonds exist.
2) By 4 single covalent bonds, it means that the bonds it forms with other C or H are covalent and not ionic or metallic. The implication is that the whole alkane molecule is made up of only covalent bonds and there's no ionic bonds and hence it has covalent properties instead of ionic properties.
As to why 4 single covalent bonds for carbon in alkanes, I will not go into that since it is A level and above. -
Hi thanks for your answers....Originally posted by teraexa:Since you seem to be taking o lvl this year, I shall just keep it at that for my answer.
1) Why are the carbon single bonded? Well carbon is an amazing element since it is in group 4. This means it has 4 valence electrons. It can opt to form single, double or even triple bonds with other elements. It does not form quadruple bonds with other elements though.
As to why the carbon atoms are singly bonded in alkanes, well alkanes are special because they are known as unsaturated compounds and in unsaturated compounds only single bonds exist in contrast to that of alkenes where double C=C bonds exist.
2) By 4 single covalent bonds, it means that the bonds it forms with other C or H are covalent and not ionic or metallic. The implication is that the whole alkane molecule is made up of only covalent bonds and there's no ionic bonds and hence it has covalent properties instead of ionic properties.
As to why 4 single covalent bonds for carbon in alkanes, I will not go into that since it is A level and above.
Izzit single bonds in alkanes are possible cause u still have hydrogen paired up with it so that it can have a stable configuration?8 electrons in the outer shell?
and covalently bonded as in something like for eg 4 hydrogen atoms are attached to the 1 single carbon atom?So in all there's 4 single covalent bonds? -
yep!
octet structure is still your friend at o lvls! -
Yea.. About the Carbon bonding ar, more indepth will be touch on dative bonding.
That's why even Carbon monoxide(CO) is covalent bonding, it will never come out in exam. -
1) What is the general formula for alkane? This will answer your question.Originally posted by lpx88:Hi thanks for your answers....
Izzit single bonds in alkanes are possible cause u still have hydrogen paired up with it so that it can have a stable configuration?8 electrons in the outer shell?
and covalently bonded as in something like for eg 4 hydrogen atoms are attached to the 1 single carbon atom?So in all there's 4 single covalent bonds?
2) Yup! 4 single covalent bonds. -
Ok thanks all for answering my queries..Now i ahve another question..
How do isomers work ah?
I mean as in..u cant just random re-arrange the atoms right?
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Isomers don't 'work'.
Isomers are merely molecules with the same chemical formula. It is just like 2 persons with the same name.
You do not really need to bother how to change from one to the other. Isomerism is just merely the fact that 2 molecules have the same formula and it does not account for how to convert to each other, just like 2 persons with the same name, the main fact is both of them have the same name but how did they get their names, you do not really care about it. -
lpx 88!!! fellow josephian!!!do u understand what u have asked already or need me to send u david kwang's notes or not......
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Originally posted by unclebutcher:lpx 88!!! fellow josephian!!!do u understand what u have asked already or need me to send u david kwang's notes or not...... Thx for asking...Im just re-reading my chem stuff now..I was actually on the verge of dropping it but i dowana take any risk..so im not trying to save it
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drop chem? chem is the easiest subject u can get an a1 for, trust me.
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i think biology is the easiest..then physics and chem
maybe depends on your lecturers -
Depends on who the sh!t is cooking your notes for chemistry.
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ah...i remember the days i used to 'borrow' chloroform from my chem lab...
then when in uni...was doing biochem..so borrow various industrial acids and dna samples
the good old days -
X2...somehow i hardly get chem ever since i started learning itOriginally posted by DC+:i think biology is the easiest..then physics and chem
maybe depends on your lecturers