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Chemistry: Post your doubts here!

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Which factor helps to explain why the first ionisation energies of the Group I elements decrease
from lithium to sodium to potassium to rubidium?
A The nuclear charge of the elements increases
B the outer electron is in the s subshell
C repulsion between spin paired electrons increases
D shieldng efect of inner electrons increases
answer is D bt shouldnt it b C???
can any1 explain me dis plz?
 
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22 On strong heating a hydrocarbon produces ethene, propane and but-1-ene in the mole ratio 5 : 1 : 1.
What is the molecular formula of the hydrocarbon?
A C17H34
B C17H36
C C19H38
D C19H40

can someone plz explain me this??
 
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22 On strong heating a hydrocarbon produces ethene, propane and but-1-ene in the mole ratio 5 : 1 : 1.
What is the molecular formula of the hydrocarbon?
A C17H34
B C17H36
C C19H38
D C19H40

can someone plz explain me this??
is the ans b ?
 
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ya
but how???
write down the molecular formula of ethene, propane and but-1-ene
then it says the ratio is 5:1:1 so multiply the molecular formula of ethene with 5 since the other ratio is 1 so we dont not need to multiply it , after multiplyin add all carbon u ll get 17 and add all hydrogen u ll get 36 so the formula is C17H36 :)
 
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write down the molecular formula of ethene, propane and but-1-ene
then it says the ratio is 5:1:1 so multiply the molecular formula of ethene with 5 since the other ratio is 1 so we dont not need to multiply it , after multiplyin add all carbon u ll get 17 and add all hydrogen u ll get 36 so the formula is C17H36 :)
thnx
very helpful :D:D:D:D
 
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In chemsitry paper 12 today does anybody remember the answer to the 7 question about the equation at equilibrium.And also the question about the structure of C8H16Br2 what were the right options?
 
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In chemsitry paper 12 today does anybody remember the answer to the 7 question about the equation at equilibrium.And also the question about the structure of C8H16Br2 what were the right options?
for 7 I chose B.. umm adding steam I think?
and the cracking one.. I went with C.. I think it was W and X.
But then you can ignore me cause I had a horrible paper *shrug*
 
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