velox
Retired
How many marks was it worth?
Im just trying to see where I need to revise also
Im just trying to see where I need to revise also
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~ ReNcH ~
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I said A I think...that it was added to see if there any sulfate ions still present. None of the others seemed correct to me.queenie said:
As for the oyster question...
It was basically along the lines of: An adult needs 12mg of zinc per day. An average oyster contains 200ppm of zinc. How many oysters are required to fulfil the daily intake of zinc for an adult?
velox
Retired
ppm = milligrams/kilogram
~ ReNcH ~
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5 from memory...velox said:How many marks was it worth?
Im just trying to see where I need to revise also
I guess the criteria would be 3 marks for identifying dis/(advantages) and 2 for assessing though I presume it's a holistic mark rather than being broken down like that.
~ ReNcH ~
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Well, I said 200 micrograms (in terms of grams) = 0.2mg but that still got me 60 (which wasn't there), so maybe my 0.2mg was wrong.velox said:
ah rats.
Were the answers something like:
0.2
1.6
17?
cause im starting to think its 17. Anyway, i THINK i put 1.6 I cant for the life of me remember now.
anyway if it was it would be:
1 oyster has 12mg of zinc,
and u need 200 mg of zinc, so:
oysters would be : 200X1 /12 = 16.6 ~ 17 bloody oysters. Damn arg, i cant remember...
Were the answers something like:
0.2
1.6
17?
cause im starting to think its 17. Anyway, i THINK i put 1.6 I cant for the life of me remember now.
anyway if it was it would be:
1 oyster has 12mg of zinc,
and u need 200 mg of zinc, so:
oysters would be : 200X1 /12 = 16.6 ~ 17 bloody oysters. Damn arg, i cant remember...
~ ReNcH ~
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Hangon hangon....it was the other way around...
You need 12mg, the oyster has 200ppm zinc.
Options were: 0.2, 12, 6 and 1.7 from memory though I'm unsure about the 12.
You need 12mg, the oyster has 200ppm zinc.
Options were: 0.2, 12, 6 and 1.7 from memory though I'm unsure about the 12.
velox
Retired
hmmm 200/(1000 * 10) = 0.02g in each oyster. So they need 600 oysters....(hmmm)
How did you get 0.2mg?
How did you get 0.2mg?
velox
Retired
You mean in success one? Maybe it wasn't cos i did so many past papers today. Must have been in a past paper if its not in the success one book.
~ ReNcH ~
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I said 200ppm = 200 micrograms (i.e. 200/1000000 of a gram)velox said:
But 200 micrograms = 0.2mg
Well, you got 600 and I got 60. The only answer close was 6. Though, again I may be wrong.
velox
Retired
Sorry hasty mistake there. 0.02g = 0.2mg. So they need 60 oysters..... Hmmmmph again.
velox
Retired
Sorry, must have been in a past exam.xrtzx said:
~ ReNcH ~
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0.02g is 20mgvelox said:
But yet we have reached no logical answer. I highly doubt that the examiners could have made an error, but anything is possible. I'm still none the wiser.
currysauce
Actuary in the making
thankgod for that combustion question !!! i got around 300
well -300 but the negative indicates exothermic
Like i said, i put 0.2 oysters
12mg per day
one oyster contains 200ppm
12/200 = 0.06 so to reach the minimum, just the 0.2 would be sufficient = I don't know tho
i wasn't taught ppm really, tho i was under the assumption that its ppm = 1mg/l
well -300 but the negative indicates exothermic
Like i said, i put 0.2 oysters
12mg per day
one oyster contains 200ppm
12/200 = 0.06 so to reach the minimum, just the 0.2 would be sufficient = I don't know tho
i wasn't taught ppm really, tho i was under the assumption that its ppm = 1mg/l
velox
Retired
0.02 grams = 20 milligrams. Another truncation error lol.
currysauce
Actuary in the making
how does that workvelox said:
m = milli, 10^-3
2mg = 0.002g