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Edexcel Chemistry GCSE paper 1 2018 unofficial mark scheme
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#2
For the lubrication of oil question,I talked about sacrificial protection and how that prevents/decreases rate of corrosion. Hydrogen test is self explanatory.The calculation answers I remember are(in no particular order):
168 tonnes
0.097 mol dm
65% (percentage yield)
93% (I got 90 at first but then i changed it so im not sure)-atom economy
Extract Calcium by electrolysis
2AL +6H+ ---- 2AL+3 + 3hydrogen gas
Drawing electrolysis and the oxygen gas and gas syringe
There are more but i can't remember everything
what about you?
168 tonnes
0.097 mol dm
65% (percentage yield)
93% (I got 90 at first but then i changed it so im not sure)-atom economy
Extract Calcium by electrolysis
2AL +6H+ ---- 2AL+3 + 3hydrogen gas
Drawing electrolysis and the oxygen gas and gas syringe
There are more but i can't remember everything
what about you?
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#3
(Original post by Iloveyou2018)
For the lubrication of oil question,I talked about sacrificial protection and how that prevents/decreases rate of corrosion. Hydrogen test is self explanatory.The calculation answers I remember are(in no particular order):
168 tonnes
0.097 mol dm
65% (percentage yield)
93% (I got 90 at first but then i changed it so im not sure)-atom economy
Extract Calcium by electrolysis
2AL +6H+ ---- 2AL+3 + 3hydrogen gas
Drawing electrolysis and the oxygen gas and gas syringe
There are more but i can't remember everything
what about you?
For the lubrication of oil question,I talked about sacrificial protection and how that prevents/decreases rate of corrosion. Hydrogen test is self explanatory.The calculation answers I remember are(in no particular order):
168 tonnes
0.097 mol dm
65% (percentage yield)
93% (I got 90 at first but then i changed it so im not sure)-atom economy
Extract Calcium by electrolysis
2AL +6H+ ---- 2AL+3 + 3hydrogen gas
Drawing electrolysis and the oxygen gas and gas syringe
There are more but i can't remember everything
what about you?
1
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#4
(Original post by TheKurrydon99)
Is it not that the lubrication prevents water from reacting and causing corrosion?
Is it not that the lubrication prevents water from reacting and causing corrosion?
Water and oxygen are needed to casue the corrosion and oil stops both.
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#5
did you all get that the amount moles of the hydrogen atom is just avogadros constant?
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#6
(Original post by ~MysteriousOne~)
did you all get that the amount moles of the hydrogen atom is just avogadros constant?
did you all get that the amount moles of the hydrogen atom is just avogadros constant?
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#7
Yea I meant weight, but why divide?
(Original post by TheKurrydon99)
What question was that? For the one that was like what is the weight of 1 hydrogen atom, I did 1/avogrados constant
What question was that? For the one that was like what is the weight of 1 hydrogen atom, I did 1/avogrados constant
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#8
(Original post by ~MysteriousOne~)
Yea I meant weight, but why divide?
Yea I meant weight, but why divide?
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#9
What was the answer of how you separate an impurity from crystals that’s all in a solution?
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#10
(Original post by Tanban)
What was the answer of how you separate an impurity from crystals that’s all in a solution?
What was the answer of how you separate an impurity from crystals that’s all in a solution?
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#11
(Original post by Student2018-2019)
you filter it first to remove solid particles then heat to crystalise then dry in dessicator
you filter it first to remove solid particles then heat to crystalise then dry in dessicator
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#13
What did u guys get for the one where they scrape zinc off the metal and its in normal weather conditions?
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#14
(Original post by Switch01)
What did u guys get for the one where they scrape zinc off the metal and its in normal weather conditions?
What did u guys get for the one where they scrape zinc off the metal and its in normal weather conditions?
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#15
What did you get for the very last question on the paper?
I'm freaking out as i think the ratio was 2;1 and i should have divided the answer!
If so does anyone remember if there were any more questions with 2;1 ratio or was there only 1 question?
Seem to be getting wound up by this question and not concentrate on the rest of the exams!!!!!!!
i got 0.2 as the answer
I'm freaking out as i think the ratio was 2;1 and i should have divided the answer!
If so does anyone remember if there were any more questions with 2;1 ratio or was there only 1 question?
Seem to be getting wound up by this question and not concentrate on the rest of the exams!!!!!!!
i got 0.2 as the answer
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#16
(Original post by PreyaPatel)
What did you get for the very last questiion on the paper?
I'm freaking out as i think the ratio was 2;1 and i should have divided the answer!
If so does anyone remember if there were any more questions with 2;1 ratio or was there only 1 question?
Seem to be getting wound up by this question and not concentrate on the rest of the exams!!!!!!!
i got 0.2 as the answer
What did you get for the very last questiion on the paper?
I'm freaking out as i think the ratio was 2;1 and i should have divided the answer!
If so does anyone remember if there were any more questions with 2;1 ratio or was there only 1 question?
Seem to be getting wound up by this question and not concentrate on the rest of the exams!!!!!!!
i got 0.2 as the answer
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#17
sorry so you are saying there was only 1 question with 2;1 ratio?
thank you - going mad lol
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#18
(Original post by Iloveyou2018)
For the lubrication of oil question,I talked about sacrificial protection and how that prevents/decreases rate of corrosion. Hydrogen test is self explanatory.The calculation answers I remember are(in no particular order):
168 tonnes
0.097 mol dm
65% (percentage yield)
93% (I got 90 at first but then i changed it so im not sure)-atom economy
Extract Calcium by electrolysis
2AL +6H+ ---- 2AL+3 + 3hydrogen gas
Drawing electrolysis and the oxygen gas and gas syringe
There are more but i can't remember everything
what about you?
For the lubrication of oil question,I talked about sacrificial protection and how that prevents/decreases rate of corrosion. Hydrogen test is self explanatory.The calculation answers I remember are(in no particular order):
168 tonnes
0.097 mol dm
65% (percentage yield)
93% (I got 90 at first but then i changed it so im not sure)-atom economy
Extract Calcium by electrolysis
2AL +6H+ ---- 2AL+3 + 3hydrogen gas
Drawing electrolysis and the oxygen gas and gas syringe
There are more but i can't remember everything
what about you?
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#19
Hi there 
I've moved your thread to the Chemistry Exams forum where hopefully you'll get more answers
In future, it's best to select the subject from the list here and create a thread in there instead 
If you want to see where threads belong, check out this thread
I've moved your thread to the Chemistry Exams forum where hopefully you'll get more answers
In future, it's best to select the subject from the list here and create a thread in there instead 
If you want to see where threads belong, check out this thread
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#20
For the biology mitosis one, did you guys put B? I'm pretty sure it is because Q is metaphase and R is when they are all together?
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