Mo_Jo.
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#1
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#1
How was the exam today....
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Qiang.Feng
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#2
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#2
I thought it was quite easy. The only question I'm slightly unsure of is the one about the evolution of the theory of techtonic plates.

For part (a) I put something about similar species on continents that were very far away and that the rock layer structure was very similar for continents that were far away aswell.

For part (b) I talked about there being more scientific evidence available now and we are now able to monitor the movements of techtonic plates.

Can anyone confirm if these will get the marks?
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azaaza
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#3
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#3
did anyone get 23 for atom economy and for the 'why can't they study all of the earth', did anyone put that the core is too hot to reach? Also, did anyone get that high tenperature decreases yield but decreases rate of reaction?


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azaaza
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#4
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#4
*Increases rate of reaction


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Qiang.Feng
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#5
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#5
(Original post by azaaza)
did anyone get 23 for atom economy and for the 'why can't they study all of the earth', did anyone put that the core is too hot to reach? Also, did anyone get that high tenperature decreases yield but decreases rate of reaction?
I got 45.8% for atom economy and 46% for percentage yield. How did you get 23%?

For the "Why can't they study all of the earth" question I put the temperature below the crust is too hot and will melt equipment they put down there (or something along those lines).

And yes, a higher temperature will decrease the percentage yield (it favours the backwards reaction - thus moving the equilibrium to the left) but it increases the rate of reaction.

What did you put for the plate techtonic evolution question?
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Mo_Jo.
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#6
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#6
(Original post by Qiang.Feng)
I got 45.8% for atom economy and 46% for percentage yield. How did you get 23%?

For the "Why can't they study all of the earth" question I put the temperature below the crust is too hot and will melt equipment they put down there (or something along those lines).

And yes, a higher temperature will decrease the percentage yield (it favours the backwards reaction - thus moving the equilibrium to the left) but it increases the rate of reaction.

What did you put for the plate techtonic evolution question?
Plate techtonic answer was anything from:


  • there's a clear fit between continents such as Africa and south America hence supporting the theory that the plates were joined.
  • identical plant fossils of the same age have been found in countries such as Antarctica, south America and Africa suggesting techtonic plates were once joined
  • Animal fossils such as the freshwater crocodile have been found in Brazil and South Africa and they couldn't swim there suggesting plates were all joined once.
  • Rock layers of the same age have been found with remarkable similarities in different countries so plates were once intact
  • Living creatures such as the earthworm can be found in countries such as the tips of both Africa And South America and they couldn't have travelled there so the techtonic plates were once joined.


Reason why they can't study earth is anything from:
  • Limited technology
  • Deeper down you go the earth the hotter it becomes
  • The crust is very solid to drill through
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ohboyimscrewed
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#7
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#7
(Original post by Mo_Jo.)
Plate techtonic answer was anything from:


  • there's a clear fit between continents such as Africa and south America hence supporting the theory that the plates were joined.
  • identical plant fossils of the same age have been found in countries such as Antarctica, south America and Africa suggesting techtonic plates were once joined
  • Animal fossils such as the freshwater crocodile have been found in Brazil and South Africa and they couldn't swim there suggesting plates were all joined once.
  • Rock layers of the same age have been found with remarkable similarities in different countries so plates were once intact
  • Living creatures such as the earthworm can be found in countries such as the tips of both Africa And South America and they couldn't have travelled there so the techtonic plates were once joined.


Reason why they can't study earth is anything from:
  • Limited technology
  • Deeper down you go the earth the hotter it becomes
  • The crust is very solid to drill through
What about the mid-Atlantic ridge, which shows that the ocean floor was spreading?
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Haidar :)
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#8
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#8
(Original post by ohboyimscrewed)
What about the mid-Atlantic ridge, which shows that the ocean floor was spreading?
I put that - I'm sure it's a mark
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RayApparently
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#9
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#9
I can't find past papers for the next chemistry exam
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laura89392
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#10
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#10
(Original post by azaaza)
did anyone get 23 for atom economy and for the 'why can't they study all of the earth', did anyone put that the core is too hot to reach? Also, did anyone get that high tenperature decreases yield but decreases rate of reaction?


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I put for the earth that the crust is too thick to drill through and also past the crust it is too hot and any equipment used would be melted


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laura89392
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#11
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#11
(Original post by RayApparently)
I can't find past papers for the next chemistry exam
Neither can I😬 I was ready to print and try them but they're not on the internet 😒


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RayApparently
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#12
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#12
(Original post by laura89392)
Neither can I������ I was ready to print and try them but they're not on the internet ������


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For all 3 sciences there's only 1 - the specimen. It is very annoying
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