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Igcse chemistry edexcel - paper 1c (13.5.14)

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to provide energy for the collisions to be successful . and for the reaction to occur . It was a guess wbu ?
And why are polymers non biodegradable ?

Reply 81

EJA132

Original post by Ammar97

to provide energy for the collisions to be successful . and for the reaction to occur . It was a guess wbu ?
And why are polymers non biodegradable ?

I said because they are inert :smile:

Reply 82

Rashed ullah

i also said that due to their inertness.Diamonds question i have written that :biggrin:

iamond has a atomic structure bonded by covalent bond of carbon and carbon atoms . The structure formed mannered as a tetrahedral arrangement . This tetrahedral arrangement makes diamond very hard by forming strong intermolecular forces. To discreet this interaction a lot of energy is required. ( Is it correct , if it , how many marks i would get from 4 marks )Candidates what you have written , using burette instead of pipette )I have written , pipette measures the fixed volume .

(edited 9 years ago)

Reply 83

amamsy

Original post by Ammar97

to provide energy for the collisions to be successful . and for the reaction to occur . It was a guess wbu ?
And why are polymers non biodegradable ?

Yup, 'cause they're inert. But tell me, why do crystals form when the hot saturated solution is cooled?

Reply 84

Sondus Hayajneh

Original post by D_Vadgama

Isn't in that any topic can come in any of the two papers. It's only that paper 2 is more experiment based.

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YOU must check the specifications so many things we dont need to know for paper 1 and only for paper 2

Reply 85

amamsy

Original post by Jackhay

Oh yeah, was that the one where before it asked for the moles or conc. of NaOH and it was like 0.25/0.25?

Yeah, but that was, like, the first or second part. The answer to the very last part should be 8.8...

Reply 86

Jackhay

Original post by amamsy

Yeah, but that was, like, the first or second part. The answer to the very last part should be 8.8...

thats a relief that I have done it, thanks

Reply 87

Jackhay

Original post by amamsy

Yup, 'cause they're inert. But tell me, why do crystals form when the hot saturated solution is cooled?

As temp of solution decreases, so does the solubility of salts, so as a saturated solution cools it is thrown out of solution.

Reply 88

GCSEsitter

Original post by Jackhay

As temp of solution decreases, so does the solubility of salts, so as a saturated solution cools it is thrown out of solution.

Could you talk about water of crystallisation left in it?

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Reply 89

a-spiringmedic

Original post by amamsy

Yup, 'cause they're inert. But tell me, why do crystals form when the hot saturated solution is cooled?

i wrote for the polymers, because of the way that they are bonded nothing can be go through them, or something like that would i get the mark >.<

edit: because microorganisms cannot break them down*

(edited 9 years ago)

Reply 90

Jackhay

Original post by GCSEsitter

Could you talk about water of crystallisation left in it?

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How do you mean?

Reply 91

GCSEsitter

Original post by Jackhay

How do you mean?

That when the solution is heated and cooled there is still a bit of water left which is in the ionic structure as water of crystallisation

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Reply 92

amamsy

Original post by a-spiringmedic

i wrote for the polymers, because of the way that they are bonded nothing can be go through them, or something like that would i get the mark >.<

edit: because microorganisms cannot break them down*

I don't think so, because it says on the specification exactly "understand that these polymers do not easily biodegrade as they are inert". But it's only a one-mark question, so don't worry too much :smile:

Reply 93

a-spiringmedic

Original post by amamsy

didn't see that on the spec :frown:

thanks tho

Reply 94

Rashed ullah

anyone plz answered my questions , that diamond was

Reply 95

Jackhay

Original post by GCSEsitter

That when the solution is heated and cooled there is still a bit of water left which is in the ionic structure as water of crystallisation

Posted from TSR Mobile

The crystallisation is the 3d giant lattice structure, but it has water 'locked' inside the crystal, hence CuSO4.5H2O

Reply 96

Jackhay

Original post by a-spiringmedic

didn't see that on the spec :frown:

thanks tho

I think it is not only the fact it is inert, but also Polymers such as this have never been seen by decomposers before, and thus they do not have the enzymes to deal with it.

Reply 97

GCSEsitter

Can anyone tell me what the last question on the chemistry paper was exactly i.e what was the equation they gave or does anyone have access to the actual paper. Thanks very much, much appreciated

Reply 98

Whizbox

Original post by GCSEsitter

Can anyone tell me what the last question on the chemistry paper was exactly i.e what was the equation they gave or does anyone have access to the actual paper. Thanks very much, much appreciated

All I can remember was that it was definitely 2 moles of NaOH (In the equation it was "2NaOH") reacting with 1 mole of the other substance which I can't remember

Reply 99

Rashed ullah

Diamonds question i have written that iamond has a atomic structure bonded by covalent bond of carbon and carbon atoms . The structure formed mannered as a tetrahedral arrangement . This tetrahedral arrangement makes diamond very hard by forming strong intermolecular forces. To discreet this interaction a lot of energy is required. ( Is it correct , if it , how many marks i would get from 4 marks )Candidates what you have written , using burette instead of pipette )I have written , pipette measures the fixed volume . PLZ ANYONE QUESTION MY ANSWER