January examz ahead !! you ready ??

[aniekan]

um.. could anyone help?View attachment 19996

It's B because the compound is in Group 2 and therefore can only lose 2 electrons to chlorine. The element is most likely to be Magnesium. therefore the charge of the Ion is X+2.

The element is in group 2 because the first two electrons have similar ionization energy. The third Ionization energy is more than double of the 2nd ionization energy because electron is removed from another shell.

 

[aniekan]

View attachment 19997

The question is not clear but based on what I am seeing , the answer will be D . A is obviously wrong because alkane do not exhibit E/Z isomerism. For a compound to exhibit E/Z isomerism , it must have a C=C ( double) bond and the group with the highest priority can either be on the same side( horizontally or vertically) or on opposite side.

 

[aniekan]

View attachment 19997

Question 9 Is D because Flourine has the least electronegativity among the given Halogen. This part is a little bit beyond (This is because it has a small charge with a very large atomic size and will easily be polarize by a cation. )

 

[Lost_Life]

Question 9 Is D because Flourine has the least electronegativity among the given Halogen. This part is a little bit beyond (This is because it has a small charge with a very large atomic size and will easily be polarize by a cation. )

what about this q ............unit 1 chemistry as-level june 2010 number 8

 

[aniekan]

what about this q ............unit 1 chemistry as-level june 2010 number 8

Moles = mass/ molar mass

sample------------------ Helium --------- Neon
Mass of sample----------4g --------------4g
Molar mass--------------4g/mol --------20.2g/mol
Mole ---------------------4/4------------ 4/20.2
----------------------------1 ----------------0.2

Divide by smallest-------- 1/0.2--------- 0.2/0.2

Ratio-------------------------------- 5 : 1

The answer is D

 

[Lost_Life]

i s

Moles = mass/ molar mass

sample------------------ Helium --------- Neon
Mass of sample----------4g --------------4g
Molar mass--------------4g/mol --------20.2g/mol
Mole ---------------------4/4------------ 4/20.2
----------------------------1 ----------------0.2

Divide by smallest-------- 1/0.2--------- 0.2/0.2

Ratio-------------------------------- 5 : 1

The answer is D

i see......... i've got another question thats bugging me. Whenever they ask us to find the number of ions present in a molecule or number of MOLES OF IONS i get confused... mind you explain it to me?

 

[aniekan]

i s
i see......... i've got another question thats bugging me. Whenever they ask us to find the number of ions present in a molecule or number of MOLES OF IONS i get confused... mind you explain it to me?

For that question first work out the moles depending on the type given ( mass/mr, conc. X volume and Volume/24dm3(24000cm3)).... then find the ratio of the ions in the compound given.
Note the Ions in a compound means the original ratio of Ions in the reactants. E.g H2SO4 = H(+1) and SO4(2-)...ie H is 1 and SO4 is 2 (1:2)
When you get the ratio, Multiple the value by moles x 6.02 x 10^23 ....

 

[Lost_Life]

For that question first work out the moles depending on the type given ( mass/mr, conc. X volume and Volume/24dm3(24000cm3)).... the find the ratio of the ions in the compound given.
Note the Ions in a compound means the original ratio of Ions in the reactants. E.g H2SO4 = H(+1) and SO4(2-)...ie H is 1 and SO4 is 2 (1:2)
When you get the ratio, Multiple the value by moles x 6.02 x 10^23 ....

is this for number of moles of ions?

 

[sana khan]

Can anyone please send me questions related to physics unit 1. And obviously related to edexcel gce a level.

 

[aniekan]

is this for number of moles of ions?

Yes

 

[Mitch Planko]

I have physics exam on jan. But I have a problem that I solved all the old and new exams including jan 2012, june 2012, specimen 2013, so what else should I solve.

 

[Lost_Life]

I have physics exam on jan. But I have a problem that I solved all the old and new exams including jan 2012, june 2012, specimen 2013, so what else should I solve.

AQA as revision

 

[Mitch Planko]

AQA as revision

Its O level physics

 

[Mitch Planko]

Please guys I need a help my last exam I got overall 86% its too bad and I need more practice on new specimen questions and its only 6 days to the exam

 

[Lost_Life]

Its O level physics

I know, but it helps to revise the basics

 

[aniekan]

Please guys I need a help my last exam I got overall 86% its too bad and I need more practice on new specimen questions and its only 6 days to the exam

lol 86% is too bad In that case 100% will certainly be too bad .......................N--d

 

[Mitch Planko]

lol 86% is too bad In that case 100% will certainly be too bad .......................N--d

86 in home = 60% in exam

 

[Lost_Life]

86 in home = 60% in exam

Don't stress yourself. Relax, take a break, and make sure you know the material clearly. Normally, if you solved all the years you will notice a pattern of questions. This way you exposed yourself to the same type of questions all over again. Overall, i'm sure you'll do fine

 

[Mitch Planko]

Don't stress yourself. Relax, take a break, and make sure you know the material clearly. Normally, if you solved all the years you will notice a pattern of questions. This way you exposed yourself to the same type of questions all over again. Overall, i'm sure you'll do fine

Thanks for your help and cheer, I hope so