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q31 answer is C ? :SCan somebody explain those?
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q23 - What do they mean by mole fraction is 0.5? How does that affect the identity of X?
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q33 - Why is it 1? Why isn't it 2?
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q35 -How does nitrogen undergo a redox reaction? It only goes from +3 to 0.
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q31 - Where do ionic bonds form? All elements present are non metals?
umm its not an option.. i asked my teacher the samething, he said that we have to think of the acid as a limiting agent..Hey umm im confused in question number 30 why do we use the moles of the ACID not alcohol? :/ and can anyone pleaase explain me questions number 4, 5 and 12 in the same exam? Thank u
q31 answer is C ? :S
add all the electrons..Hey umm im confused in question number 30 why do we use the moles of the ACID not alcohol? :/ and can anyone pleaase explain me questions number 4, 5 and 12 in the same exam? Thank u
Q5Hey umm im confused in question number 30 why do we use the moles of the ACID not alcohol? :/ and can anyone pleaase explain me questions number 4, 5 and 12 in the same exam? Thank u
Can somebody explain those?
View attachment 28900
q23 - What do they mean by mole fraction is 0.5? How does that affect the identity of X?
View attachment 28901
q33 - Why is it 1? Why isn't it 2?
View attachment 28902
q35 -How does nitrogen undergo a redox reaction? It only goes from +3 to 0.
View attachment 28904
q31 - Where do ionic bonds form? All elements present are non metals?
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s07_qp_1.pdf Q9 plz :/Nope it's B.
Sulfur trioxide is acidic, and ammonia is a base so that's an acid-base reaction. If you check the equation no oxidation or reduction takes place in any of the elements.
Its C aluminum carbide
Al4C3+12H2O------->4AL(OH)3+3CH4
CH4+2O2----->2H2O+CO2
Moles of CO2=72/24000=0.003
moles of Al4C3= 0.003/3=0.001 (as ratio of Al4C3:CH4 is 1:3)
now mass of Al4C3= 0.001 into (27+27+27+27+12+12+12)=0.144g
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dis was done by jiyad ahsan
what about question 34 in may june 07? ThanksQ5
the answer is D, since when the difference between molecules of a liquid and a gas is the forces holding the liquid molecules together so, in this case hydrogen bonding
so just vaporize a mole of liquid hydrogen halide and note down the energy change that would also be an indicator to the strength of the (hydrogen)bonds
Can somebody explain those?
View attachment 28900
q23 - What do they mean by mole fraction is 0.5? How does that affect the identity of X?
View attachment 28901
q33 - Why is it 1? Why isn't it 2?
View attachment 28902
q35 -How does nitrogen undergo a redox reaction? It only goes from +3 to 0.
View attachment 28904
q31 - Where do ionic bonds form? All elements present are non metals?
15 Use of the Data Booklet is relevant to this question.
The combustion of fossil fuels is a major source of increasing atmospheric carbon dioxide, with a
consequential rise in global warming. Another significant contribution to carbon dioxide levels
comes from the thermal decomposition of limestone, in the manufacture of cement and of lime for
agricultural purposes.
Cement works roast 1000 million tonnes of limestone per year and a further 200 million tonnes is
roasted in kilns to make lime.
What is the total annual mass output of carbon dioxide (in million tonnes) from these two
processes?
A 440 B 527 C 660 D 880
You see the total amount of limestone roasted is 1200 (1000+200)
Now we make the equation
CaCO3 => CaO + CO2
We find the moles of limestone = 1200/(40.1+12+ 16 x 3) = 11.98
Since the mole ratio of CaCO3:C02 is 1:1, we find the mass, we multiply by the mr of co2 which is 44. 11.9 x 44 = 527.47. Ans B
Can you please tell what papers are these from?
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