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Chemistry: Post your doubts here!
octo nov 2015 mark scheme 21?????? -
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Chemistry: Post your doubts here!
26 How many moles of hydrogen, H2, are evolved when an excess of sodium metal is added to one mole of citric acid? CO2H HO C CH2CO2H CH2CO2H citric acid A1B2C3D4 -
Chemistry: Post your doubts here!
9 Nitrogen reacts with hydrogen to produce ammonia. N2(g) + 3H2(g) 2NH3(g) A mixture of 2.00mol of nitrogen, 6.00mol of hydrogen, and 2.40mol of ammonia is allowed to reach equilibrium in a sealed vessel of volume 1 dm3 under certain conditions. It was found that 2.32 mol of nitrogen were... -
Chemistry: Post your doubts here!
The following half reactions occur when potassium iodate(V), KIO3, in hydrochloric acid solution oxidises iodine to ICl –. IO– +2Cl– +6H+ +4e– →ICl– +3HO 322 I +4Cl– →2ICl– +2e– 22 What is the ratio of IO – to I in the balanced chemical equation for the overall reaction? 32 A1:1 B1:2 C1:4 D2:1 -
How was 9700_w15_p22?
really bad! what did you put on question 1? and the anopheles question? -
Global Perspectives
Can someone give me any help with gp? Any good tips or something? Any plan scheme to write the essay? Urgentt -
Physics: Post your doubts here!
Does anyone have notes about waves and electricity please?? -
Physics: Post your doubts here!
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w07_qp_2.pdf Question 1b and 4c help please??? -
Chemistry: Post your doubts here!
Omgg im so dumb!!! now i know what i was doing wrong ahahahah thanksss -
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Chemistry: Post your doubts here!
So 20/0.288 = p(H20) + p (CO) and then i don't understand, it doesn't give me nothing for h20 and is the p(co) 1/4 x Tp? what is the Tp?? -
Chemistry: Post your doubts here!
Thank you again!! Can you help me with another one please? May june 2014 P12 Q4 Hydrogen and carbon dioxide gases are mixed in equal molar amounts at 800 K. A reversible reaction takes place. H2(g) + CO2(g) H2O(g) + CO(g) At equilibrium, the partial pressures of H2 and CO2 are both 10.0 kPa... -
Chemistry: Post your doubts here!
thank you!! and this one 10 The equilibrium constant, Kc, for the reaction H2(g) + I2(g) 2HI(g), is 60 at 450 ÅãC. What is the number of moles of hydrogen iodide in equilibrium with 2 mol of hydrogen and 0.3 mol of iodine at 450 ÅãC? paper may june 2014 11 question 10 -
Chemistry: Post your doubts here!
A student mixed 25.0 cm3 of 0.350 mol dm–3 sodium hydroxide solution with 25.0 cm3 of 0.350 mol dm–3 hydrochloric acid. The temperature rose by 2.50 ÅãC. Assume that no heat was lost to the surroundings. The final mixture had a specific heat capacity of 4.20 J cm–3K–1. What is the molar... -
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Me and mechanics do not work well together.....
Me and mechanics do not work well together.....- MafaldaC
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