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chemistry a level partial pressure question
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found a question on chemsheets that i disagree with the worked solution for. I'll upload a picture...
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that's their markscheme!
i get x = 0.025 instead, with a different method
i get x = 0.025 instead, with a different method
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#6
I agree with the worked solution. It doesn't give the moles of each substance but A = 0.278, B = 0.278 and C = 0.444.
Chemsheets is notorious for having wrong questions, wrong answers, etc. so I may have done something wrong
Chemsheets is notorious for having wrong questions, wrong answers, etc. so I may have done something wrong
Last edited by harleyh4; 1 year ago
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i don't agree with their use of algebra
that's mathematically incorrect, to completely square root like that, I think!
i created a quadratic equation, even though it says you don't need to, and i solved it for 0.022
that's mathematically incorrect, to completely square root like that, I think!
i created a quadratic equation, even though it says you don't need to, and i solved it for 0.022
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#8
(Original post by hj!gz)
i don't agree with their use of algebra
that's mathematically incorrect, to completely square root like that, I think!
i created a quadratic equation, even though it says you don't need to, and i solved it for 0.022
i don't agree with their use of algebra
that's mathematically incorrect, to completely square root like that, I think!
i created a quadratic equation, even though it says you don't need to, and i solved it for 0.022
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#9
I did it again with a quadratic and got 0.22
End up with the quadratic 1.45x^2 + 2.55x - 0.6375 = 0. Put it into my calculator and got the 0.22. I still think the worked answer is right, regardless of method.
End up with the quadratic 1.45x^2 + 2.55x - 0.6375 = 0. Put it into my calculator and got the 0.22. I still think the worked answer is right, regardless of method.
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#10
(Original post by hj!gz)
i don't agree with their use of algebra
that's mathematically incorrect, to completely square root like that, I think!
i created a quadratic equation, even though it says you don't need to, and i solved it for 0.022
i don't agree with their use of algebra
that's mathematically incorrect, to completely square root like that, I think!
i created a quadratic equation, even though it says you don't need to, and i solved it for 0.022
square root both sides
4 = 8/2 ✓
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4 = 144/36
square root both sides
2 = 12/6 ✓
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it's not mathematically incorrect
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