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

Cambridge Chemistry Challenge

Scroll to see replies

Reply 3220

chem@uni

Original post by Arithmeticae

this is pretty much exactly what i've done so perhaps the numbers we're using are slightly off or something? :s-smilie:

ps - you might want to remove that, don't want to spoil the method for other people (if that even is the right way)

Original post by MozyAdam

I second that.

PLEASE SHOW WHERE I HAVE GONE WRONG!!!

Yes it is right maybe best to delete if you get the answer

Reply 3221

MozyAdam

Original post by lekha2611

Gold Q: Because it's 2 moles of gold for every 2 moles of HCl, do you just work out the moles of gold and carry the number across to use on the HCl - you don't have to divide it to find one mole? None of my figures are being accepted :s-smilie:

If Gold was the one about gold. Then you are overcomplicating it. As the song goes, three wise men brought gifts. If one is something, another is another...

Reply 3222

MozyAdam

Original post by Arithmeticae

this is pretty much exactly what i've done so perhaps the numbers we're using are slightly off or something? :s-smilie:

ps - you might want to remove that, don't want to spoil the method for other people (if that even is the right way)

Yes, change your values in step 1 and 4. The specific heat capacities.

hint for Rg?

What is the temperature change for Rg?

Reply 3225

jonzza_81

Original post by zhang-liao

Can I have another clue please :frown:

another clue for gold

Spoiler

(edited 9 years ago)

Reply 3226

Feraligatr

Original post by jonzza_81

another clue for gold

Spoiler

Done that one already

Stuck on Rg

Reply 3227

jonzza_81

Original post by MozyAdam

If Gold...

wanna hide all that under the spoiler tag?

Reply 3228

jonzza_81

Original post by zhang-liao

What is the temperature change for Rg?

should be in the question

Spoiler

Original post by Arithmeticae

any help for rg? i can't see where i'm going wrong with my calculations atm :s-smilie:

Spoiler

(edited 9 years ago)

Reply 3229

Feraligatr

Original post by jonzza_81

should be in the question

Spoiler

Aaah, been using 120...

Reply 3230

whatacrydonnie

Hint for Ag please?

Posted from TSR Mobile

Reply 3231

acog

I've just done copper-I had to just calculate it by counting...didn't take too long. Now stuck on silver, google doesn't seem to have any definitive opinions...

Reply 3232

Laurasaur

For those stuck on Rg who feel like they're missing a step

Spoiler

(edited 9 years ago)

Reply 3233

Parth7600

stuck on gold plssssss!!!! :frown:

hints pls..... I think know that one particle is cholesterol????

Reply 3234

Uhhh

So I got to rg really easily in about 30 mins but I can't seem to do rg. Can someone give me a hint or PM me the mass because I think that might be where I'm going wrong (btw I'm happy to help anyone)

Posted from TSR Mobile

Reply 3235

atothepowerofa

help with copper pleaseeeeeeee :smile:

Reply 3236

MozyAdam

Yeh, pm if you want help. To be quite honest, this month's challenge was more challenging than most. Rg was relatively straight forward once you knew what you were doing.
One but of advice though is make sure you use the right constants. There is slight variation on the internet which van quite drastically change your answer. Don't be afraid of a huge answer too.

Posted from TSR Mobile