Edexcel CHEMISTRY DOUBTS!!!!

[~ Miss Relina ~]

ok that one understood

can you confirm this plz green line

[The Golden Girl =D]

ONe second!

EDIT:

I labelled them 1 to 4.

Number 4 is Triplet and Number 3 is a Triplet.

# 4 cuz CH  next to CH₂ , n+ 1= 2+1= 3   hence triplet

# 3 cuz CH₃  next to CH₂ , n+ 1= 2+1= 3   hence triplet

I always hesitate fa ya3ni sorry cuz I might've confused you more =[

[~ Miss Relina ~]

Thanks
I think I'll fail nmr ............ confusing and hard 

[~ Miss Relina ~]

ONe second!

heheh......what

[The Golden Girl =D]

I editted it ,co chck it please =]

[~ Miss Relina ~]

I editted it ,co chck it please =]

I'll confuse you more and tell you that '' the CH group should be C only as it's a benzene ring what do u think

ya Allah be with  us  

also does two triplets have the same chemical shift I mean it just gives a hint on the adjacent hydrogen atoms ohhhhhhhhhhhhhhhh .........kan Allah fi el 3on

[The Golden Girl =D]

3adee ma faragat. You know why cuz we don't look at how many hydrogen IT has we look at HOW MANY Hydrogen are NEIGHBORING it.

C is next to NO Carbon with a Hydrogen group except for Ch2 ,sa7 ?  so it's a triplet 2+1 = 3

=]

[~ Miss Relina ~]

I'll confuse you more and tell you that '' the CH group should be C only as it's a benzene ring what do u think

ya Allah be with  us  

also does two triplets have the same chemical shift I mean it just gives a hint on the adjacent hydrogen atoms ohhhhhhhhhhhhhhhh .........kan Allah fi el 3on

editted

[The Golden Girl =D]

check this : http://www.youtube.com/watch?v=Oj-yxbPz5Ao    but skip the beginning =]

I'm sorry bas mu5i dareeb fa sorry 3al confusion 2ili 3amaltileek 2eeaha.

Good night  Take care =]

[~ Miss Relina ~]

check this : http://www.youtube.com/watch?v=Oj-yxbPz5Ao    but skip the beginning =]

I'm sorry bas mu5i dareeb fa sorry 3al confusion 2ili 3amaltileek 2eeaha.

Good night  Take care =]

goodnoght Jazaki Allah Kairan 

[The Golden Girl =D]

Wa Jazaki =]

salam.

[SZM]

hey folk, i cm across some doubts.

1. Carbon consists of the isotopes 12C, 13C and 14C. Chlorine consists of the isotopes 35Cl and 37Cl. Use this data to calculate the maximum relative molecular mass of a molecule of carbon tetrachloride, CCl4

2. State the type of bond present in solid Sodium?? i think it is metallic bonding. Am i correct??

3. Write the equation for the process occurring when the second ionisation energy of oxygen is measured?? How can we write the equation??

OXYGEN is belonged to non-metal. Ok. So oxygen gains 2 electrons to form O2-. Am i right. So the energy needed to gain is called electron affinity// ow come ionisation energy is needed for oxygen??? cnt understand.. pls cn someone explain me clearly in details..

4. Why mass spectrometer always work with positive ions not negative ions??? if u say cant. why cant?? we cnt always accept the theory without reason. then we are said to be foolish by accepting their theory without reason. If u know the reason, pls tel me. it would be great help.

5. the graph shows the first seven successive ionisation energies of an element X, which is in Period 3 of the Periodic Table. 

in graph, the y-axis is IONISATION ENERGY/ KJmol-1 and the x-axis is NUMBER OF THE ELECTRON REMOVED. It shows an increase rate from the first to the fourth and small slight change of  increasing from 4th to 5th and small slight change of increasing from 5th to 6th. But there is a huge jump from 6th to7th.

the questions are-
      1. use the information on the graph to state in which GROUP of the Periodic table X is found. Justify your answer.
       2. identify the element X
       3. The mass spectrum of X shows a singly charged molecular ion at m/e = 256. Write the formula of this ion.


pls cn someone answer those questions above clearly in details, so that i will be able to understand much better.

pls reply to my doubts asap.

[Master_Key]

hey folk, i cm across some doubts.

1. Carbon consists of the isotopes 12C, 13C and 14C. Chlorine consists of the isotopes 35Cl and 37Cl. Use this data to calculate the maximum relative molecular mass of a molecule of carbon tetrachloride, CCl4

2. State the type of bond present in solid Sodium?? i think it is metallic bonding. Am i correct??

3. Write the equation for the process occurring when the second ionisation energy of oxygen is measured?? How can we write the equation??

OXYGEN is belonged to non-metal. Ok. So oxygen gains 2 electrons to form O2-. Am i right. So the energy needed to gain is called electron affinity// ow come ionisation energy is needed for oxygen??? cnt understand.. pls cn someone explain me clearly in details..

4. Why mass spectrometer always work with positive ions not negative ions??? if u say cant. why cant?? we cnt always accept the theory without reason. then we are said to be foolish by accepting their theory without reason. If u know the reason, pls tel me. it would be great help.

5. the graph shows the first seven successive ionisation energies of an element X, which is in Period 3 of the Periodic Table. 

in graph, the y-axis is IONISATION ENERGY/ KJmol-1 and the x-axis is NUMBER OF THE ELECTRON REMOVED. It shows an increase rate from the first to the fourth and small slight change of  increasing from 4th to 5th and small slight change of increasing from 5th to 6th. But there is a huge jump from 6th to7th.

the questions are-
      1. use the information on the graph to state in which GROUP of the Periodic table X is found. Justify your answer.
       2. identify the element X
       3. The mass spectrum of X shows a singly charged molecular ion at m/e = 256. Write the formula of this ion.


pls cn someone answer those questions above clearly in details, so that i will be able to understand much better.

pls reply to my doubts asap.

1. RFM = (14*1) + (37*4)

2. Metallic

3. Ionization Energy --> yes.

Oxygen has 8 electrons. Measure the amount of energy required to remove the 7th electron after removing the 8th electon.

O+ --> O2+ + Ionization energy(2)

[dk bose]

4. First a heated filament gives electrons, they them pass into the ionisation chamber. the sample is injected as a gas into the ionisation chamber of the mass spectrometer.As the electrons collide with the molecules of the sample and the electrons are removed to give positive ions.

OR

In the mass spectrometer, the sample is blasted with high energy electrons.this knocks electrons from the atoms in the sample.As protons(+) balance out electrons(-) in an atom.When one or more,electrons is knocked off an atom the protons now outnumber the electrons,therefore the ion formed is positively charged. 

[SZM]

thanx folks for ur help n ur hard work. but I couldnt understand how come?? nevermind. i will find out.. Insha ALlah.