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Cambridge Chemistry Challenge

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Original post by jonzza_81
write the elements in order of atomic mass, space between the symbols, no commas

Thanks, on to silver now
Reply 2741
Avatar for alow
alow
19
Original post by amtheril

Spoiler



Spoiler that.
Original post by alow
Spoiler that.

yeah sorry I will take it down
Original post by alow
Spoiler that.


can you show me how to do Rg? I keep getting the value of 0.000104 hours, but this is obviously wrong.
Reply 2744
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alow
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Original post by amtheril
can you show me how to do Rg? I keep getting the value of 0.000104 hours, but this is obviously wrong.


Spoiler

Original post by alow

Spoiler



What is DE?
Original post by amtheril
What is DE?


I don't understand
Reply 2747
Avatar for alow
alow
19
Original post by amtheril
I don't understand


Differential equation.
Original post by ElMoro
...


I hate cambridge!
You don't need diffs to answer Rg
My chemistry teacher gave everyone this sheet to help

Spoiler

Reply 2750
Avatar for alow
alow
19
Original post by jonzza_81
You don't need diffs to answer Rg
My chemistry teacher gave everyone this sheet to help

Spoiler


That uses the integrated form of the DE.
Original post by alow
That uses the integrated form of the DE.
im so dumb.... now im getting 1663 hours but that is also wrong urggh..... in the end, a semi final conclusion was that 0.5006573143=t/h - is this correct or wrong?
Original post by amtheril
im so dumb.... now im getting 1663 hours but that is also wrong urggh..... in the end, a semi final conclusion was that 0.5006573143=t/h - is this correct or wrong?

by the way thank you for putting in the effort of taking the photograph - it should have helped me alot
Reply 2753
Avatar for alow
alow
19
Original post by amtheril
im so dumb.... now im getting 1663 hours but that is also wrong urggh..... in the end, a semi final conclusion was that 0.5006573143=t/h - is this correct or wrong?


Close, but no cigar.

For that picture, it's really just a ****ty way of solving

dMdt=Ae−kt, k,A∈R\dfrac{\text{d}M}{\text{d}t} = \text{A}e^{-\text{k}t}, \: \text{k}, \text{A} \in \mathbb{R}

You should be able to work out what k and A are pretty easily.

As for where you're going wrong:

Spoiler

(edited 9 years ago)
Original post by alow
Close, but no cigar.

For that picture, it's really just a ****ty way of solving

dMdt=Ae−kt, k,A>0, k,A∈R\dfrac{\text{d}M}{\text{d}t} = \text{A}e^{-\text{k}t}, \: \text{k}, \text{A} > 0, \: \text{k}, \text{A} \in \mathbb{R}

You should be able to work out what k and A are pretty easily.

As for where you're going wrong:

Spoiler


alow you do me too much honour!!!
hey:smile: im on the gold challenge, but my poor year 11 brain cant handle this, i think its something to do with it being a crystal (ionic lattice), ive tried using CPK colouring to determine the elements but that doesn't work, i think the fractions are just to show the position on the atom, but are they more relevant, any useful tips for figuring it out ??
Guys it's almost May!!:eek:
Original post by fizzers
Guys it's almost May!!:eek:


ARE YOU EXCITED
because I am
:ahee:

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YES OF COURSE :colone:
although i feel like i won't be happy for too long bc I'll probably be frustrated more than aything
Original post by fizzers
YES OF COURSE :colone:
although i feel like i won't be happy for too long bc I'll probably be frustrated more than aything


That is true
Also I really enjoy sleep and I'm not likely to get any tonight
OH WELL

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