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Chemistry Doubts: IGCSE Paper 3

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That's 2007. If you open the 2007 syllabus it will say, "Understand cathodic protection blah blah blah."
I believe A simple distinguishing between cathodic and sacrificial Protection is that cathodic protection needs power supply and Sacrificial Does not need a Power Supply ...!!!
 
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hey i need to know whats important to know in organic chemistry that most likely comes all the time because it always screws me up :(
also tell me how to solve questions like these where you have to show alternate products
Q.Chlorine reacts with butane in a substitution reaction.
CH3—CH2—CH2—CH3 + Cl 2 → CH3—CH2—CH2—CH2—Cl + HCl
Give the structural formula of another possible product of this reaction.
 
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hey i need to know whats important to know in organic chemistry that most likely comes all the time because it always screws me up :(
also tell me how to solve questions like these where you have to show alternate products
Q.Chlorine reacts with butane in a substitution reaction.
CH3—CH2—CH2—CH3 + Cl 2 → CH3—CH2—CH2—CH2—Cl + HCl
Give the structural formula of another possible product of this reaction.
There's two possibilities:
Either the chlorine is found in a different place, so:
2-Chlorobutane CH3-CHCl-CH2-CH2-CH3
3-Chlorobutane CH3-CH2-CHCl-CH2-CH3
OR Both chlorines react to give dichlorobutane and Hydrogen
1,2 Dichlorbutane CH2Cl-CHCl-CH2-CH2-CH3
etc. with different positions of the chlorine
 
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hey i need to know whats important to know in organic chemistry that most likely comes all the time because it always screws me up :(
also tell me how to solve questions like these where you have to show alternate products
Q.Chlorine reacts with butane in a substitution reaction.
CH3—CH2—CH2—CH3 + Cl 2 → CH3—CH2—CH2—CH2—Cl + HCl
Give the structural formula of another possible product of this reaction.

They can give u almost anything in organic but do revise Macromolecules cause theyre usually there Organic is really easy just common sense
The other possible formula colud be
CH3-CH2-CH2-CHCl2 You just have to subsitute hydrogen for chlorine
 
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I just spent the past half-hour solving a chemistry paper, and was like "WOW! This is super easy, I'm amazing at chemistry"
Obviously since I'm not amazing at chemistry I started to doubt this was even a paper, took a look down.. realize its paper 2..
Im going to go shoot myself, brb.
 
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Cathodic protection is not a big fuss, it's just like electrolysis and sacrificial protection had some 'fun' and had a baby; which was called Cathodic protection.
It's just like electrolysis.
Trust me, nothing in detail will be asked.. questions asked will be general knowledge (if they come by any chance), asking you tell differences and stuff like that.
 
Messages
405
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391
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I just spent the past half-hour solving a chemistry paper, and was like "WOW! This is super easy, I'm amazing at chemistry"
Obviously since I'm not amazing at chemistry I started to doubt this was even a paper, took a look down.. realize its paper 2..
Im going to go shoot myself, brb.
LOL ^
Made me day
 
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Guys what do u think
1. Was the most difficultEST paper for Chem P3
2. Was the most difficultEST paper for Physics P6
 
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Guys what do u think
1. Was the most difficultEST paper for Chem P3
2. Was the most difficultEST paper for Physics P6
ON 10 33 for Chemistry, for some reason.. I did miserable at this paper when I got it for my mocks.
Physics, all papers are the same. It's so DIFFICULT to make mistakes in physics P6, they give the formulae and everything in the paper itself (it shouldn't even be called an exam)
 
Messages
807
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696
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103
Cathodic protection is not a big fuss, it's just like electrolysis and sacrificial protection had some 'fun' and had a baby; which was called Cathodic protection.
It's just like electrolysis.
Trust me, nothing in detail will be asked.. questions asked will be general knowledge (if they come by any chance), asking you tell differences and stuff like that.

Check out M/J 2007 Chemistry P3
It has a question about Cathodic protection
Pretty simple basic stuff
Take a look ull get an idea
 
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Lol.. chemistry's literally killing me..
On to the next paper! (Hopefully EXTENDED this time >____> )
Awww its oki Just 2 majors left
I lovee Chemistryyy But Physics P6 is scaring me
 
Messages
807
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696
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ON 10 33 for Chemistry, for some reason.. I did miserable at this paper when I got it for my mocks.
Physics, all papers are the same. It's so DIFFICULT to make mistakes in physics P6, they give the formulae and everything in the paper itself (it shouldn't even be called an exam)
Thanx
Dude its not the calculation part in Physic P6 its when they ask u stoopidd Reasons And Explanations and Suggestion And Improvement BLAAh Blaah Drives me crazzy
 
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