Qualification > Sciences

ALL CIE CHEMISTRY DOUBTS HERE !!

<< < (10/142) > >>

Adzel:
yes please...

and take your time.

Deadly_king:

--- Quote from: Adzel on October 05, 2010, 03:43:05 pm ---Can someone plz answer these questions for me  :)...

--- End quote ---

It would surely have been quicker if you specified your problems. I mean, you would not gain anything if we do everything for you.

Anyway I'll be starting by the last number. I guess we'll be meeting midway Garfield ;)

Adzel:
OK do Q3(all), Q4(all) and Q6(b) ONLY...

nid404:
Question 4

a) The first ionization energy is the energy required to remove one electron from each atom in one mole of gaseous atoms of an element.

b)
                 
              kJ/mol       log10I.E
1st I.En    801                 2.9
2nd I.E     2427               3.4
3rd I.E      3660               3.6
4th I.E     25026              4.4
5th I.E     32808              4.5

Boron has electronic configuration 1s22s22p1

c)As you can see (graph attached), there is a general increasing trend of I.Es. It is easier to remove the further most electron and hence a low First I.E. Once the p electron is removed, shielding effect decreases and electrons are more closely held by the nucleus and hence an increase in the 2nd and 3rd I.E. Following,there are only two electrons in the first shell and they are closest to the nucleus. Hence a huge change between the 3rd and 4th I.E.

(since they haven't provided the marks, I have explained what I think you would ought to know)

d) i) Sulphur



    ii)Potassium

nid404:
On question 3....in a while.

Navigation

[0] Message Index

[#] Next page

[*] Previous page