Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

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C7 GCSE OCR 21st Century, 20 June

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Original post by Jlendon

Does anyone have any ideas on grade boundaries ?

My guess is low

Dreading this exam because of how laid back I've been about it!!
I'm relying on low grade boundaries

Original post by M.M.HUSSAIN

Anyone know how to answer the first 6 marker on the specimen paper. I've see the mark scheme but i just don't get it. Thanks.

Sorry bit late response but:
Hydrochloric acid + magnesium -> magnesium chloride and hydrogen

This reaction isn't reversible as a strong acid such as hydrochloric acid completely breaks its hydrogen and chlorine bonds so release more h+ ions than a weak acid.

Methanoic acid + magnesium -> magnesium methanoate + hydrogen

This reaction is reversible because weak acids don't completely break their bonds and exist in a equilibrium and release less H+ ions.
Has to be symbol equations though to be balanced.

Posted from TSR Mobile

im scared about ittt

what is C3H7COOH+CaCO3? what does it make and how do you balance it?

Need to revise these Analytical Procedures of Chromatography, Titrations and Solution Concentration!!!

Gonna get through this tonight.

What questions can they ask about these analysis? 6 markers? Will only one procedure come up?

wow, got negged for asking a question :confused:

:confused:

Edit:and again for this comment :rolleyes:

:rolleyes:

(edited 10 years ago)

Original post by M.M.HUSSAIN

what is C3H7COOH+CaCO3? what does it make and how do you balance it?

It would make calcium proponoate + water + carbon dioxide (I think)

and the symbol equation is:
2C3H7COOH + CaCO3 -> Ca(C3H7CO2)2 + H2O + CO2

(When a carboxylic acid reacts with a carbonate it produces salt, water and carbon dioxide)

(edited 10 years ago)

Original post by M.M.HUSSAIN

what is C3H7COOH+CaCO3? what does it make and how do you balance it?

Hmm it would make calcium butanoate + water + carbon dioxide
No clue how to write calcium butanoate as a symbol. If i took a guess i would say C3H7COOCa. Once u found that out you would be able to balance

Posted from TSR Mobile

Sorry maybe Ca(C3H7COO)2
And its not propanoate because the acid has 4 carbons. Hope this helps you out

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(edited 10 years ago)

Original post by M.M.HUSSAIN

DOWNLOAD THESE:

http://vle.lvc.org/file.php/244/Higher%20Chemistry/tfcs_sep_ic7-4_eb.pdf?forcedownload=1
http://vle.lvc.org/file.php/244/Higher%20Chemistry/tfcs_sep_ic7-3_eb.pdf?forcedownload=1
http://vle.lvc.org/file.php/244/Higher%20Chemistry/tfcs_sep_ic7-5_eb.pdf?forcedownload=1
http://vle.lvc.org/file.php/244/Higher%20Chemistry/tfcs_sep_ic7-2_eb.pdf?forcedownload=1
http://vle.lvc.org/file.php/244/Higher%20Chemistry/tfcs_sep_ic7-1_eb.pdf?forcedownload=1

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what are these???

Original post by M.M.HUSSAIN

Great news Bitesize now written all the Sevens (B7, C7, P7)!

http://www.bbc.co.uk/schools/gcsebitesize/science/triple_ocr_21c/further_chemistry/

bbc's a bit delayed. when we're about to finish our exams, THEN they update it. how extremely useful.

Original post by Ferrari Lexus

what are these???

Its like a mini textbook for C7

What revision guide you guys been using? I've learnt tons from the collins separate sciences

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SklIsMentalAbuse

I know it's stupid to ask at this stage but is electrolysis in our spec?

Original post by SklIsMentalAbuse

I know it's stupid to ask at this stage but is electrolysis in our spec?

The thing about c7 is they assume u have a understanding of c1-6 but no its not linked to anything we're doing

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Original post by M.M.HUSSAIN

Great news Bitesize now written all the Sevens (B7, C7, P7)!

http://www.bbc.co.uk/schools/gcsebitesize/science/triple_ocr_21c/further_chemistry/

You sir, are the greatest student on TSR now

Original post by M.M.HUSSAIN

what is C3H7COOH+CaCO3? what does it make and how do you balance it?

Seems like someone has it in you

Carboxylic acid + Calcium Carbonate = calcium xate + Water + Carbon dioxide

Nice to know I'm not the only one worried about the exam and trying to learn as much as possible tonight :smile:

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.
How far has everyone done with revision?

Original post by Ferrari Lexus

what 6 markers may come up???

My teacher said its very likiely the haber process, standard solutions and the types of chromotography as atleast one of them will probably come up.

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