Cambridge Chemistry Challenge

Scroll to see replies

Reply 1920

ugh how do you read a dna sequence -.-
i really have no idea

Help please! I think I know what to do with the names of the countries i just get the wrong answer. ;'( How didd you do silver?
actually dw i got it! :smile:

(edited 10 years ago)

Reply 1921

Nat_LPS

For copper I'm looking up specific heat capacity but I havent a clue which one im meant to use... is it of the products or combined gases in air? If latter, one is lost.
I may be wrong conpletely aha

Posted from TSR Mobile

Reply 1922

ChemistryQuiz

Original post by MistyDream

Thanks.
I think I got the energy required (is the answer it too big?), but how to i get the volume of Methane required to get that value? Thanks in advance. :smile:

Got it!

Original post by django123

Help please! I think I know what to do with the names of the countries i just get the wrong answer. ;'( How didd you do silver?
actually dw i got it! :smile:

How did you get Copper? Am so confused! :confused:

Reply 1923

SnA_JPH

Original post by ChemistryQuiz

How did you get Copper? Am so confused! :confused:

work out the mass of air, then the energy required to heat it. you can probably get the rest from there. :smile:

Reply 1924

SnA_JPH

after sleeping on it i have realised.... Rg is impossible to me XD i would really appreciate any kind of help i can get :smile:

i know how to do it, its just finding what goes where that im having trouble with :/

(edited 10 years ago)

Reply 1925

Nat_LPS

Original post by SnA_JPH

work out the mass of air, then the energy required to heat it. you can probably get the rest from there. :smile:

I've got moles of air in the room, i'm confused how to get mass what's air's Molar mass gonna be?? I sound so stupid aha :s

Reply 1926

SnA_JPH

Original post by Nat_LPS

I've got moles of air in the room, i'm confused how to get mass what's air's Molar mass gonna be?? I sound so stupid aha :s

look at the density of air... that will give you the mass :smile:

Reply 1927

username1319033

Original post by SnA_JPH

dont worry did it ^_^

Help, please? :smile:

Reply 1928

SnA_JPH

Original post by rabirabbit

Help, please? :smile:

assume its an rna sequence... read it as that, then translate :smile:

its quite a nice message

Reply 1929

ivana_a.h

Original post by SnA_JPH

look at the density of air... that will give you the mass :smile:

Is it the density at stp?

Reply 1930

SnA_JPH

Original post by ivana_a.h

Is it the density at stp?

its always stp unless specified :smile:

Reply 1931

ChemistryQuiz

How on earth did those 107 geniuses complete it? :eek:

Either they're too quick or am too slow. Guess I'd go with the latter. :rolleyes:

Reply 1932

ivana_a.h

Original post by SnA_JPH

its always stp unless specified :smile:

Is the energy somewhere around the millions?

Reply 1933

SnA_JPH

Original post by ChemistryQuiz

How on earth did those 107 geniuses complete it? :eek:

Either they're too quick or am too slow. Guess I'd go with the latter. :rolleyes:

the annoying thing is one of them is in my chem class -.- no badge for me then XD

Reply 1934

SnA_JPH

Original post by ivana_a.h

Is the energy somewhere around the millions?

millions of joules yes :smile:

if you are in Kj you went wrong somewhere

Reply 1935

Nat_LPS

crying.
PV =nRT or deltaH = m x c x change in temp
this is another language to me jeez me teacher's taking his time getting to cambridge's favourite topic

Reply 1936

Solivagant

Now I don't want to gloat, but I just full on guessed the correct answer to both bronze and gold.
Which is very lucky because I wouldn't have been able to work them out.

Reply 1937

ChemistryQuiz

Original post by SnA_JPH

the annoying thing is one of them is in my chem class -.- no badge for me then XD

Hey! No worries. You've got 6 more months to go. Am sure you'll get it in January. :wink:

Reply 1938

ChemistryQuiz

Original post by CJG21

Now I don't want to gloat, but I just full on guessed the correct answer to both bronze and gold.
Which is very lucky because I wouldn't have been able to work them out.

Guessing tips, please? :biggrin:

Reply 1939

username1319033

Original post by CJG21

Now I don't want to gloat, but I just full on guessed the correct answer to both bronze and gold.
Which is very lucky because I wouldn't have been able to work them out.