OCR GATEWAY CHEMISTRY B 16th June C4 C5 C6

yeah i got albania

Posted from TSR Mobile

Omg for the last question I put United States and then Niger because I swear you had to do the water available divided by the population because it said it was in comparison to the population not the water used? So like say 20g of water is used and theres 50g of water available but theres a population of 500 million of people? The water availability is still not very high because of the population, not the water used?

Reply 62

idachak

Also for the water and carbon dioxide comparing chart, I put water had a high melting point which I think was wrong, and I put electrons for carbon dioxide... is that right? I mean electrons are particles and are in carbon dioxide...

Reply 63

idachak

And for the removing hardness of water, I said that the sodium carbonate reacts with the water to form sodium hydrocarbonate, which is a white precipitate and is then removed as part of the hardness of water... is that right? :confused:

And my friend said apparently sample A was permanent, B was both permanent and temporary and C was temporary. I put A is permanent and B and C are temporary... I dont think you can have both permanent and temporary hardness can you??

Reply 64

randoms1324

you can have both temp and permanent hardness in water because otherwise after boiling the water it would have only needed 2cm cubed of soap (like distilled water which was at the top)

Posted from TSR Mobile

(edited 9 years ago)

Reply 65

idachak

Original post by randoms1324

you can have both temp and permamnt hardness in water

Posted from TSR Mobile

How??
And so was sample B temporary or both?

Reply 66

randoms1324

sample A had permanent because it didnt change the amount of soap it needed, sample B didnt need as much soap after it was boiled but still had permanent hardness because boiling it only got rid of the temp hardness sample C had only temp hardness so therefore only needed 2cm cubed of soap after being boiled like distilled water (which was at the top of the table) hope i helped :smile:

Posted from TSR Mobile

Reply 67

randoms1324

what did you put for the question at the start of the paper of the table where you had to fill in the type of atom it was like it gave one which was ion - i cant remember the exact question :colondollar:

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Reply 68

Darcy1

12

Original post by randoms1324

did anyone get something like 0.059 for the concentration of nitric acid? im surprised it was only worth 2/3 marks

Posted from TSR Mobile

Thats wrong unfortunately, they asked for 3 significant figrues and your answer is only 2, I got 0.0595

Reply 69

Darcy1

12

Original post by geekygeek

And for the removing hardness of water, I said that the sodium carbonate reacts with the water to form sodium hydrocarbonate, which is a white precipitate and is then removed as part of the hardness of water... is that right? :confused:

And my friend said apparently sample A was permanent, B was both permanent and temporary and C was temporary. I put A is permanent and B and C are temporary... I dont think you can have both permanent and temporary hardness can you??

The carbonate ions from the washing soda react with the calcium ions in the hard water to make an insoluble precipitate of Calcium Carbonate.

Reply 70

Darcy1

12

Original post by GDZK

Yeah.. C6H1206---> H2H5OH+CO2, that's what i got however, was the question to also balance it?

Yeah you had to balance it, but shouldn't it be C2H5OH and not H2H5OH?

Reply 71

rosiemayx

Original post by geekygeek

Omg for the last question I put United States and then Niger because I swear you had to do the water available divided by the population because it said it was in comparison to the population not the water used? So like say 20g of water is used and theres 50g of water available but theres a population of 500 million of people? The water availability is still not very high because of the population, not the water used?

Oh I just put Albania because it had the smallest water available and it had quite a big population. And not a lot of water was used. Which shows that many don't get enough, I think? (I have no idea btw)

Reply 72

mikyyyyy

this was a question where you needed to estimate the value.
it was simple because there wasn't really a method to get the answer so u needed ur answer to just make sense eg for the first box u just needed the value to be higher then the previous 2 and lower then the one after. in the mark scheme there will be a range of answers that u can put down.

Reply 73

idachak

so what did you guys put for the type of particles in carbon dioxide? For the question where it said water had ions? I put electrons... is that kinda right? I mean electrons are particles and are in carbon dioxide? :confused:

Reply 74

heench

OP

Original post by geekygeek

so what did you guys put for the type of particles in carbon dioxide? For the question where it said water had ions? I put electrons... is that kinda right? I mean electrons are particles and are in carbon dioxide? :confused:

erm i think i put molecules because carbon dioxide is a simple molecular substance, which I'm pretty sure is the wrong answer haha oh well, it was only one mark i think?

Reply 75

heench

OP

Original post by Darcy1

Thats wrong unfortunately, they asked for 3 significant figrues and your answer is only 2, I got 0.0595

yayy thats what i got

Reply 76

elliot785

in the question about components of CO2 it said NaCl or something contained ions, so would the answer be atoms for CO2?

Reply 77

idachak

Original post by heench

erm i think i put molecules because carbon dioxide is a simple molecular substance, which I'm pretty sure is the wrong answer haha oh well, it was only one mark i think?