Didn't the next question say how they are better than regular ones though. I put they have a larger surface area, a nano particle having a larger surface area to volume ratio than an atom doesn't make sense.

Reply 403

dee08

Original post by Dr Carlsberg

Afraid not, nanoparticles are larger than atoms, because they are made up of them. But your thermometer answer should be fine because the resolution would make a difference.

Was the nanoparticle question only one mark? And the one after about it being a better catalyst?

Posted from TSR Mobile

Reply 404

Naco88

Original post by Benb2000

No, it asked how nanoparticles compare to the size of atoms.

Wasn't it how it compares to a powder?

Reply 405

Yasminxb

For the percentage by mass question, I wrote 82.35% since they weren't asking about rounding etc, and the answer had many digits, so would I still get the mark for 82.35%??

Reply 406

OmarAl

Original post by Yasminxb

For the percentage by mass question, I wrote 82.35% since they weren't asking about rounding etc, and the answer had many digits, so would I still get the mark for 82.35%??

thats what I wrote should be fine there will probs be a range

Reply 407

Benb2000

Original post by Naco88

Wasn't it how it compares to a powder?

There were two questions I believe, one for asking how the size of a nanoparticle compares with that of an atom and then another one asking how 1g of something is more effective using either nanoparticles or atoms as the catalyst. Something like that.

Reply 408

Dr Carlsberg

Original post by dee08

Was the nanoparticle question only one mark? And the one after about it being a better catalyst?

Posted from TSR Mobile

Yeah, I think they were both individual one markers

Reply 409

username2628955

Original post by Benb2000

No, that's wrong, it asked how it compared to the size of an atom, in which case the nanoparticles are much bigger

Damn, that is so sneaky. I basically skimmed the question thinking it was like the one i had seen so many times before in past papers.

Lost a mark because of it :angry:

Reply 410

Everydaygent

Original post by Naco88

Wasn't it how it compares to a powder?

There was two.

First one was:
How does the size of a nanoparticle compare in relation to the size of an atom?

Second:
Give a reason why 1g of Cobalt oxide nanoparticles would make a better catalyst than 1g of powder cobalt oxide.

Reply 411

Benb2000

Original post by MrAviator

Properties of nanoparticles summed up from bitesize:

"Nanoparticles of a material show different properties compared to larger particles of the same material. Forces of attraction between surfaces can appear to be weak on a larger scale, but on a nanoscale they are strong.One reason for this is the surface area to volume ratio. In nanoparticles this is very large. Atoms on the surface of a material are often more reactive than those in the centre, so a larger surface area means the material is more reactive."

Reply 412

Benb2000

Original post by Anygy

Damn, that is so sneaky. I basically skimmed the question thinking it was like the one i had seen so many times before in past papers.

Lost a mark because of it :angry:

Hehe, AQA love doing this to people

Reply 413

mmgnaahk123

What about the one where it asked "How can the student change the method to investigate the rate of reaction at 5°C?

Reply 414

arj2104

Original post by Moustafa123r

I think u need to put because sulphur is produced as a solid and this block the view or makes it turn to cloudy

I made the stupid mistake of saying Sodium Chloride is insoluble. Although I didn't mention sulfur do you think I can get one mark for saying "insoluble precipitate which cannot dissolve"

Reply 415

arj2104

Original post by mmgnaahk123

What about the one where it asked "How can the student change the method to investigate the rate of reaction at 5°C?

I said put it in a water bath to cool it down to 5 degrees

Reply 416

1jonam16

Original post by arj2104

I said put it in a water bath to cool it down to 5 degrees

Could you say change the initial temperature to which wverything is heated ? Like in the experiment it said everything was heated to a readying temp. Surely, this temperature needs to be less than 5 degreees?

Reply 417

arj2104

Original post by 1jonam16

I thought it was a poorly worded question. Hopefully, if you gave an attempt to show that you would cool it to 5 degrees or reduce the overall temperature in some way, I think you can get the marks. It was a one marker so I doubt they were looking for a lot.