Edexcel - Chemistry Unit 2 - 4 June 2013

I missed up the oscilloscope and a few electricity bits but I think I did quite well. I didn't really like the 6 marker

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oh , but im talking about the unit 1 paper lol , i messed up in it :frown:

Reply 401

Mimi85

Original post by Jayqwe

I posted both yesterday either in this thread or another one

can u please post t for me again , cuz i really have to go through21 pages and theirs no time ,,, please :colondollar:

thanks

Reply 402

Katy1704

Someone please help

Original post by Katy1704

Hello

I'm confused on question 17fii on the May 2011 paper. What apparatus is the mark scheme looking for? (If you have a page number in the edexcel textbook would be very helpful so I can see it) thank you

Reply 403

charlieejobson

9

hey all, does anyone understand this:

during the titration, the barium hydroxide was added until it was present in excess. the electrical conductivity of the titration mixture:

A: increased steadily
B: decreased steadily
C: increased then decreased
D: decreased and then increased

The answer is D but does anyone know why??

Reply 404

Gnome :)

2

Original post by Mimi85

can u please post t for me again , cuz i really have to go through21 pages and theirs no time ,,, please :colondollar:

thanks

It's either on the page before this one, or the one before that. It would take 2 mins to find it. I worry for you if this is the attitude you take towards your revision.

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Reply 405

Goods

16

Original post by charlieejobson

hey all, does anyone understand this:

during the titration, the barium hydroxide was added until it was present in excess. the electrical conductivity of the titration mixture:

A: increased steadily
B: decreased steadily
C: increased then decreased
D: decreased and then increased

The answer is D but does anyone know why??

Barium hydroxide reacts to produce something that's not soluble i guess. Therefore the number of aqueous ions decreases then as barium goes into excess the number of ions increases. The whole question would help though I can only guess not knowing the titre and samples

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Reply 406

Goods

16

Original post by Mimi85

oh , but im talking about the unit 1 paper lol , i messed up in it :frown:

I do AQA must be different boards

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Reply 407

Goods

16

Original post by Katy1704

Someone please help

Post the question please I can't help without something to answer :redface:

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Reply 408

Priya08

Original post by Goods

Barium hydroxide reacts to produce something that's not soluble i guess. Therefore the number of aqueous ions decreases then as barium goes into excess the number of ions increases. The whole question would help though I can only guess not knowing the titre and samples

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Helpp

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1369994818852.jpg28.9KB

Reply 409

Goods

16

Original post by Priya08

Helpp

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the electric conductivity of a solution depends on the numbers of dissolved ions. When the barium hydroxide is added it reacts with the dissolve ions to form a solid therefore reducing the number of ions and the conductivity. When you start adding it in excess you and more ions therefore increasing the conductivity. So decrease then increase

Reply 410

senz72

19

Sorry guys, I need an answer to this question. Are we required to know unit 1?

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Reply 411

Goods

16

Original post by senz72

Sorry guys, I need an answer to this question. Are we required to know unit 1?

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yes

Reply 412

Priya08

Original post by Goods

the electric conductivity of a solution depends on the numbers of dissolved ions. When the barium hydroxide is added it reacts with the dissolve ions to form a solid therefore reducing the number of ions and the conductivity. When you start adding it in excess you and more ions therefore increasing the conductivity. So decrease then increase