Chemistry: Post your doubts here!

[Alice123]

http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s06_qp_1.pdf
Q2

 

[syed1995]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s06_qp_1.pdf
Q2

Answer is B.. There will be 3 peaks For Cl2.. at 70,72 and 74 BY Cl35 And Cl35 .. giving 70 mass. Cl35 and Cl37 giving 72 Mass.. and Cl37 and Cl37 giving 74 Mass.

 

[kingos3111]

guys please there is oct nov 2004 q10 please abt eqbm pressure how to solve this please i need detail much appreiiciated i try to figure but how plesse help

 

[h4rriet]

guys please there is oct nov 2004 q10 please abt eqbm pressure how to solve this please i need detail much appreiiciated i try to figure but how plesse help

Draw an ICE chart, i.e. initial concentration, change in concentration and equilibrium concentration for all the reactants and products.

 

[LeoMessi]

Can someone please please help me with question 1 of this paper. Thanking you in advance

 

[h4rriet]

Can someone please please help me with question 1 of this paper. Thanking you in advance

Multiply by Avogadro's constant.

 

[h4rriet]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s07_qp_1.pdf
Q20

Draw CCl3CF3 and CCl2FCF3. What's the difference? A Flourine atom. Free radical substitution.

 

[kingos3111]

Draw an ICE chart, i.e. initial concentration, change in concentration and equilibrium concentration for all the reactants and products.

can u tell me wat should i plot nothing is given only 20percent mass wat sshold i do

 

[taimoor.08]

question no21 may june 2002
question no 2 may june 2002
question no 8 may june 20025
question no 3 ,8,9,10 oct nov 2002
question no 3,20,28 oct nov 2003
may june 2003 question no 8,20,32
question no 40 oct nov 2003
question no 5 may june 2004
quesyion no 5,8,18,28,35,39 may june 2004
oct nov 2005 queston no 2, 5,23,28,31
oct nov 2004 question 20
may june 2005 quetion 11,18
mayjune 06 q10,30
oct/nov questions 06 4,9,11,21
may june 07 questions 5,26,34,40
oct nov 07 questons 33
winter 08 2,8,30
winter 09 21,28,31
summer 10 qp 11 question no 4, 27
winter 10 questions 7 ,8 any one please answer thest ones​

 

[kingos3111]

moles r not given or volume wat should i put on ice table please help

 

[kingos3111]

k tell me iinitia lmoles of h2o is wat

 

[Student12]

HEEEEELLLLLLLLLLLLLLLLLLLLLLLLP !

A few questions i'm not able to solve on Moles..
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w02_qp_1.pdf Q1 (C)http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w05_qp_1.pdf Q1(C)
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_w08_qp_1.pdf Q1,Q2,Q4
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s03_qp_1.pdf Q2
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s05_qp_1.pdf Q2(why is it not 1.5?)
http://papers.xtremepapers.com/CIE/...d AS Level/Chemistry (9701)/9701_s08_qp_1.pdf Q2

 

[kingos3111]

just <content removed> help me in this moles u <content removed> cmon the eqbm please

 

[kingos3111]

k so wat moles help

 

[kingos3111]

guys the initial moles of h2o is not given how can i multip;y it with 0.8 help

 

[h4rriet]

guys please there is oct nov 2004 q10 please abt eqbm pressure how to solve this please i need detail much appreiiciated i try to figure but how plesse help

Just a second, I'm uploading the answer.

 

[h4rriet]

guys the initial moles of h2o is not given how can i multip;y it with 0.8 help

HERE YOU GO:

Tell me if you still don't understand; I'll try and make it more clear.

 

[kingos3111]

thanx i love u but how did we get 0.1 i didnt get that thanx

 

[h4rriet]

HEEEEELLLLLLLLLLLLLLLLLLLLLLLLP !

A few questions i'm not able to solve on Moles..
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w02_qp_1.pdf Q1 (C)http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w05_qp_1.pdf Q1(C)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w08_qp_1.pdf Q1,Q2,Q4
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s03_qp_1.pdf Q2
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s05_qp_1.pdf Q2(why is it not 1.5?)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s08_qp_1.pdf Q2

1. Construct balanced equations for the combustion of 1 mole (10 cm3) of methane and ethane. Take the moles to be the volume. CO2 will be a product; it'll react with KOH, so you can minus the moles of CO2 from the total volume of the products (i.e. volume of CO2 + H2O).
1. Construct a balanced equation.
1. Construct a balanced equation and use mole ratios.
2. Just take the moles to be the volume. SO2 and CO2 react with NaOH, so you'll minus their volumes from the total volume.
4. Count the electrons!
2. 1 C=C bond will take 1 mole of H2 when it becomes saturated. Count the number of C=C bonds initially, and the number of C=C bonds left after the reaction. Subtract the second from the first to get the number of moles of H2 used.
2. Because NaN3 decomposes to give Na also, which in turn reacts to give more N2. So technically this new N2 is actually coming because of the NaN3. You have to take it into consideration as well.
2. 100 grams of fertiliser contains 15 g of N2. So 14 grams will contain x moles. c=x/v.

 

[kingos3111]

ooooooo is it becaause 1 mole of h2o gives 1 mole of hydrogen and half moles of 02 but isnt that principle only applies to kc not kp help thanx luk