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haochen said:ohh srry i thought u asked for 3) d) i)
my bad
wait a min and ill try to post the answer
haochen said:the answer is......
in the attachment but i know ull ask hw so :
if they ask u to draw a polymer , all u need to do is break the double bond between C and C.
and put them in parenthesis with a line (like the one i draw) and a small "n" (so it continue until n time)
draw everything the same just break the double bond and make it one
hope that helped
xIshtar said:The ionic structure contains ions arranged in a regular pattern, So, positive, negative, positive negative, positive, negative. No two positives should be directly below/above or to the side..
By positive I mean caesium and by negative, chlorine..
So:
Cs, Cl, Cs, Cl, Cs, Cl
Cl, Cs, Cl, Cs, Cl, Cs
Cs, Cl, Cs, Cl, Cs, Cl.
Something like that.
xIshtar said:No, draw the ions with circles, distinguishing between them by placing their symbol inside.
JmCullen said:saraiqbal123 said:i have some problem in the following question i will really appriciate if u ppl help me in this!!
http://www.xtremepapers.me/CIE/Cambridg ... _qp_32.pdf
question number 8(c) in this link.
this is the mark scheme:
http://www.xtremepapers.me/CIE/Cambridg ... _ms_32.pdf
can anyone do this? i'm stuck too!
im stuck in the mole of lead(II) nitrate..
why it's 0.0133 ??? :%)
saraiqbal123 said:JmCullen said:saraiqbal123 said:i have some problem in the following question i will really appriciate if u ppl help me in this!!
http://www.xtremepapers.me/CIE/Cambridg ... _qp_32.pdf
question number 8(c) in this link.
this is the mark scheme:
http://www.xtremepapers.me/CIE/Cambridg ... _ms_32.pdf
can anyone do this? i'm stuck too!
im stuck in the mole of lead(II) nitrate..
why it's 0.0133 ??? :%)
it'll be something like this i guessJmCullen said:xIshtar said:No, draw the ions with circles, distinguishing between them by placing their symbol inside.
errr.. do u mind to draw it?
im kinda confuse. :%)
jeez i was so stupid!!!!JmCullen said:gary221 said:cud sum1 pls help me with this????
P.S. with an explnation!!! :friends: :friends: :friends:
It's A..
unsaturated should be double bond..
Then, C is acid.
acid can't be neutral in water.
so it's A..
HorsePower said:it'll be something like this i guessJmCullen said:xIshtar said:No, draw the ions with circles, distinguishing between them by placing their symbol inside.
errr.. do u mind to draw it?
im kinda confuse. :%)
gary221 said:jeez i was so stupid!!!!JmCullen said:gary221 said:cud sum1 pls help me with this????
P.S. with an explnation!!! :friends: :friends: :friends:
It's A..
unsaturated should be double bond..
Then, C is acid.
acid can't be neutral in water.
so it's A..
thnx bro!!!
HorsePower said:it'll be something like this i guessJmCullen said:xIshtar said:No, draw the ions with circles, distinguishing between them by placing their symbol inside.
errr.. do u mind to draw it?
im kinda confuse. :%)
JmCullen said:http://www.xtremepapers.me/CIE/index.php?dir=Cambridge%20IGCSE/0620%20-%20Chemistry/&file=0620_w08_qp_03.pdf
4(b)(ii)
----------------------------------------------------
how did you know which compound decomposes or not?
http://www.xtremepapers.me/CIE/index.ph ... 8_ms_3.pdf
6(b)(ii)
xIshtar said:JmCullen said:http://www.xtremepapers.me/CIE/index.php?dir=Cambridge%20IGCSE/0620%20-%20Chemistry/&file=0620_w08_qp_03.pdf
4(b)(ii)
----------------------------------------------------
how did you know which compound decomposes or not?
http://www.xtremepapers.me/CIE/index.ph ... 8_ms_3.pdf
6(b)(ii)
For 4(b)(ii):
92.3/12 = 7.7
7.7/1 = 7.7
Taking ratios.. 7.7:7.7
=> 1:1.
For 6(b)(ii):
Alkali metals apart from Lithium do not decompose, so the first is no reaction, and the second is calcium oxide + water.
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