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# Cambridge Chemistry Challenge watch

1. (Original post by Oromis263)
Currently working on it
Im working on gold too, some sort of element i thought at first but then realised the arrow, so maybe some enthalpy value
2. (Original post by david2457)
Im working on gold too, some sort of element i thought at first but then realised the arrow, so maybe some enthalpy value
I'm only doing gcse science, can you clarify whether or not enthalpy is change of energy?

My starting point was googling 'Hartree'.

Edit: Tried multiplying the bohr radii by value in angstroms: ≈ 0.53 Å and calculating au from there, didn't work.
(0.741152 and 614.764)

Edit 2: Does anyone know what the background is? I assumed it was light (orange emited photons) but now I'm not sure.
3. gold is difficult
4. (Original post by chemistinthemaking)
gold is difficult
I wouldnt know im still stuck on copper....
5. clues for copper?
6. (Original post by Cubic)
I'm only doing gcse science, can you clarify whether or not enthalpy is change of energy?

My starting point was googling 'Hartree'.

Edit: Tried multiplying the bohr radii by value in angstroms: ≈ 0.53 Å and calculating au from there, didn't work.
(0.741152 and 614.764)

Edit 2: Does anyone know what the background is? I assumed it was light (orange emited photons) but now I'm not sure.
http://en.wikipedia.org/wiki/Hartree

Try wikipediaing the Hartree and use the last equivalent formula for energy on hartrees. Yes enthaltpy is change of energy, or energy used/required.
7. (Original post by david2457)
Try wikipediaing the Hartree and use the last equivalent formula for energy on hartrees. Yes enthaltpy is change of energy, or energy used/required.
have you done it?
8. (Original post by chemistinthemaking)
have you done it?
No I'm stuck, has anyone done it?
9. (Original post by david2457)
Try wikipediaing the Hartree and use the last equivalent formula for energy on hartrees. Yes enthaltpy is change of energy, or energy used/required.
Ah, I thought so, we've been referring to it as deltaH in school.

This equation?

10. Can anybody help me with silver?
11. (Original post by david2457)
http://en.wikipedia.org/wiki/Hartree

Try wikipediaing the Hartree and use the last equivalent formula for energy on hartrees. Yes enthaltpy is change of energy, or energy used/required.
Is that supposed to give the answer or?
I have a value using that, it's just a pain to enter in..
12. (Original post by chantelleeee)
Can anybody help me with silver?
Google the names of top two rows (represented by letters) and find what's common between them.
13. (Original post by Cubic)
I'm only doing gcse science, can you clarify whether or not enthalpy is change of energy?

My starting point was googling 'Hartree'.

Edit: Tried multiplying the bohr radii by value in angstroms: ≈ 0.53 Å and calculating au from there, didn't work.
(0.741152 and 614.764)

Edit 2: Does anyone know what the background is? I assumed it was light (orange emited photons) but now I'm not sure.
can you give me a clue for copper please
14. (Original post by Oromis263)
Is that supposed to give the answer or?
I have a value using that, it's just a pain to enter in..
same lol
15. (Original post by Cubic)
Ah, I thought so, we've been referring to it as deltaH in school.

This equation?

Yes, I'm not sure if this is right though
16. (Original post by Me123456789)
can you give me a clue for copper please
Find what the number 3 has to do with CaCO3, wikipedia will help.
17. Yeah I immediately tried doing the last equation:
(h dash x c x a)/a0
but it didn't work...
Has anyone worked out the significance of the background?
18. Want value have you got?
Yeah I immediately tried doing the last equation:
(h dash x c x a)/a0
but it didn't work...
Has anyone worked out the significance of the background?
What was gold?
20. guessing so far....

graph of potential energy against distance.

graph in background = solar flare

proton + proton collision, energy require to overcome coulomb barrier

however, straight line indicates quantum tunneling.

STUCK!

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Updated: August 18, 2016
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