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December 26, 2025, 09:50:11 am
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Author Topic: Chemistry: Discussion, Questions & Potential Solutions  (Read 39906 times)

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Mischi

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #15 on: November 13, 2018, 12:45:26 pm »
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I remember it as 3.0g as well, is it true that you get only one mark deducted across the whole exam for incorrect sig figs?
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Freddie Hg

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #16 on: November 13, 2018, 12:46:07 pm »
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Quote from: Mischi on November 13, 2018, 12:45:26 pm
I remember it as 3.0g as well, is it true that you get only one mark deducted across the whole exam for incorrect sig figs?
yes
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AlphaZero

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #17 on: November 13, 2018, 12:48:17 pm »
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You can only lose 1 mark across the exam for significant figures.

Also, in the materials table, it says "3 g of potassium nitrate (\(\text{KNO}_3\))", but in the Methods section for the calibration, it says "Measure 3.0 g of \(\text{KNO}_3\) accurately", so I suspect, you're meant to use 3.0 g
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Freddie Hg

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #18 on: November 13, 2018, 12:50:05 pm »
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Quote from: dantraicos on November 13, 2018, 12:48:17 pm
You can only lose 1 mark across the exam for significant figures.

Also, in the materials table, it says "3 g of potassium nitrate (\(\text{KNO}_3\))", but in the Methods section for the calibration, it says "Measure 3.0 g of \(\text{KNO}_3\) accurately", so I suspect, you're meant to use 3.0 g
thats an error on their behalf. having two masses with differing sig figs
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billy606

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #19 on: November 13, 2018, 12:50:30 pm »
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What did u guys get for the concentration of ethanol in cellulose or something along the lines of that (in % m/m)
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DinWell

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #20 on: November 13, 2018, 12:51:02 pm »
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Quote from: Freddie Hg on November 13, 2018, 12:50:05 pm
thats an error on their behalf. having two masses with differing sig figs
Yeah, what's up with that crap? Such a stupid thing to do...
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Vri123

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #21 on: November 13, 2018, 12:51:45 pm »
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Quote from: billy606 on November 13, 2018, 12:50:30 pm
What did u guys get for the concentration of ethanol in cellulose or something along the lines of that (in % m/m)
11.375% =11%
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AngryGoanna

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #22 on: November 13, 2018, 12:55:15 pm »
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Quote from: DinWell on November 13, 2018, 12:52:48 pm
Did you take into account that only a certain percentage of the plant is cellulose?
Well I forgot to and I got 30 something percent, the percentage of the plant was 37% so his 11% answer must be correct.
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billy606

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #23 on: November 13, 2018, 12:58:44 pm »
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Quote from: AngryGoanna on November 13, 2018, 12:55:15 pm
Well I forgot to and I got 30 something percent, the percentage of the plant was 37% so his 11% answer must be correct.
im 100% sure i didnt forget to multiply by .37 and got 30 something percent. So hmmmmm.
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DinWell

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #24 on: November 13, 2018, 12:59:43 pm »
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Quote from: billy606 on November 13, 2018, 12:58:44 pm
im 100% sure i didnt forget to multiply by .37 and got 30 something percent. So hmmmmm.
Haha same. Now I'm confused....
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Mischi

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #25 on: November 13, 2018, 01:00:39 pm »
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I got around 30% as well
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Vri123

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #26 on: November 13, 2018, 01:02:33 pm »
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Quote from: DinWell on November 13, 2018, 12:59:43 pm
Haha same. Now I'm confused....
Only 37% of plant m was cellulose, but the question stated that 1000kg of plant m produced 144L of ethanol. The percentage is irrelevant in this case as 144L was produced
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DinWell

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #27 on: November 13, 2018, 01:03:50 pm »
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Quote from: Vri123 on November 13, 2018, 01:02:33 pm
Only 37% of plant m was cellulose, but the question stated that 1000kg of plant m produced 144L of ethanol. The percentage is irrelevant in this case as 144L was produced
But it asked for the percentage by mass of cellulose, right?
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Vri123

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #28 on: November 13, 2018, 01:05:31 pm »
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Quote from: DinWell on November 13, 2018, 01:03:50 pm
But it asked for the percentage by mass of cellulose, right?
No if it was percentage by mass of celloluse it would by 37% which is already given in the question
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jpulvirenti

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Re: Chemistry: Discussion, Questions & Potential Solutions
« Reply #29 on: November 13, 2018, 01:06:09 pm »
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what did you get for a systematic error
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