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Star-fire said:http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w05_qp_1.pdf
can some1 please explain question no.34....and
Which physical properties are due to hydrogen bonding between water molecules?
1 Water has a higher boiling point than H2S.
2 Ice floats on water.
3 The H−O−H bond angle in water is approximately 104°.
isn't number 3 suppose 2 be correct bcoz water has 105 angle?! but only 1 & 2 r correct
Silent Hunter said:aslam u alikum
i wanted some useful note and understanding of chapter of equilibrium of AS chemistry. especially the equilibrium calculations
Thank You
Waalaikumassalam!Silent Hunter said:aslam u alikum
i wanted some useful note and understanding of chapter of equilibrium of AS chemistry. especially the equilibrium calculations
Thank You
Silent Hunter said:http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w04_qp_1.pdf
can anybody explain question number 12 ?
Dayyanah said:hey
can anyone help me with the data booklet for chem and formulae booklet for math
thanx in advance
wen r the 2011 oct/nov papers gonna b available?
What you wrote is mentioned in the er as the mistake made by the majority of the candidates: "Most candidates simply referred to doubling the individual error, taking no account of positive or negative error". In this one mark question, you are supposed to give a precise reason why the max. error in titration is +/- 0.10 cm^3. This is so because the final burette reading could be +0.05 cm^3 and the initial burette reading could be -0.05 cm^3. Upon subtraction, you will get a max. error of : +0.05 - (-0.05) = +0.10 cm^3.CaptainDanger said:Q1 d ) My answer to it is as followed
Final reading error + initial reading error makes it .10 as the error 0.05 so it is doubled...
While marking scheme and examiner reports say something else??? Explain that?
Here are the paper, marking scheme and examiner report :
9701_s09_qp_31.pdf
9701_s09_ms_31.pdf
9701_s09_er.pdf
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