IGCSE Edexcel Chemistry 19th May 2016

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Reply 20

pprish.chandaria

Original post by maruchan

yes you don't have to worry about it :smile:

Alright.

Reply 21

meme259

Could anyone quickly summarise how you know which salt making method to use? I know the mixing/stir/filter one is two soluble salts to make an insoluble salt, but for the others, how do you know whether to use a titration or the other method?

Reply 22

sonia_bhayani

Original post by pprish.chandaria

Sure I will do that. Uhmm no I don't have the CGP book

i have it, ill bring it to school tomorrow :smile:

Reply 23

Zellaforever

Does anyone understand why calcium hydroxide is used to neutralise acidic soil in fields

Reply 24

pprish.chandaria

Yes
This is because calcium hydroxide is an alkali and the soil is acidic. Whereby an acid is neutralized by the alkali

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Reply 25

pprish.chandaria

Thank you Sonia

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Reply 26

Milzime

could anyone help me out with explaining this:
(general topic of polymerisation, additional polymerisation etc. The question itself made me go whaaaaat? and I just guessed because it's better than a blank amirite :yy:

the Gold is me marking and my expression of ~woe~ THANKS IN ADVANCE I REALLY NEED HELP >.< )

Reply 27

pprish.chandaria

Thank you Sonia

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Reply 28

Johnnieb623

Original post by Milzime

the Gold is me marking and my expression of ~woe~ THANKS IN ADVANCE I REALLY NEED HELP >.< )

You've just drawn the propene molecule out when its basically asking you to draw two monomers joined together like in the diagram shown above it. It wants to see that you understand that the C-C double bond is broken to allow more monomers to join.

(edited 7 years ago)

Reply 29

edcj

Original post by Milzime

the Gold is me marking and my expression of ~woe~ THANKS IN ADVANCE I REALLY NEED HELP >.< )

All it wants to see if the repeat monomer unit drawn out twice, the ms shows the CH3 in different orientations but they could be the same side.

Reply 30

Milzime

Original post by edcj

All it wants to see if the repeat monomer unit drawn out twice, the ms shows the CH3 in different orientations but they could be the same side.

Original post by Johnnieb623

thank youuu I get it now, I was just being a bit blind hahah

Reply 31

username2580959

Did any of you do the AQA iGCSE chemistry double award exam today?

no you scrub

Original post by pprish.chandaria

Hi guys.
I have problems answering questions related to bonding. Please help.

Reply 34

pprish.chandaria

Hi guys
How did the paper go?

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Reply 35

caiob

Original post by pprish.chandaria

Hi guys.
I have problems answering questions related to bonding. Please help.

hey, what do u need to know about it? covalent, metallic and ionic bonding?

Reply 36

pprish.chandaria

Thanks for replying, but I already received help on that topic.

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Reply 37

caiob

for those who did the double award edexcel igcse chemistry today, did u guys put carbon dioxide as a compound of unpolluted gas?

Reply 38

dance25

Original post by caiob

for those who did the double award edexcel igcse chemistry today, did u guys put carbon dioxide as a compound of unpolluted gas?

Ya you could put h20 as well

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Reply 39

dRaGoN2509

Original post by caiob

for those who did the double award edexcel igcse chemistry today, did u guys put carbon dioxide as a compound of unpolluted gas?

Yes. I put CO2, I thought of putting O2 but then it said compound so CO2 was the only viable answer since it's the only compound in air (argon, oxygen, nitrogen are elements). Other people put H20 though, not sure if that's right?