Chemistry student of nairaland,where are you?Either you a jambite or a student of Polytechnic and University lets meet here and solve chemistry questions,it may be the one for O-level,Jamb and advanced chemistry.u are all welcome as u contribute.
For physics thread,click on dis link below
https://www.nairaland.com/1404215/nairaland-physics-gurus#17840190

Sorry for the inconviniency

Fynestboi: Sorry for the inconviniency

thanks man

We can now meet to start our chemistry from d simplest to the advanced....we need your hands,chemistry student in various institutions to explain better to people some advanced topics.
Not only to ask and answer questions but give deep explanation to the answers.

Am in menh,am ready to solve any prob on chemistry nd to try ma best

Answer did simple 1
what is the atomic number of an elemrnt whose ion X^2+ has electronic configuration of 1s2 2s2 2p6 3s2 3p6?

Kunlexic: Answer did simple 1
what is the atomic number of an elemrnt whose ion X^2+ has electronic configuration of 1s2 2s2 2p6 3s2 3p6?

16 whch is oxygn

Mikebis: 16 whch is oxygn

ah bro,u are wrong...dis it as follows X^2+=2+2+6+2+6=18electrons since its a positive ion with 2 charges,dat means it has given out 2 out of his electrons,so the element is an element with atomic no 20,20 protons and 20 electrons which is calcium not oxygen...pls quote me if i am wrong coz am still a learner.

Kunlexic: ah bro,u are wrong...dis it as follows X^2+=2+2+6+2+6=18electrons since its a positive ion with 2 charges,dat means it has given out 2 out of his electrons,so the element is an element with atomic no 20,20 protons and 20 electrons which is calcium not oxygen...pls quote me if i am wrong coz am still a learner.

u wrng guy,take 4 example avin atomic mass of 40,atomic numb 20 of ca^2+.
No. Of protons=20
No. Of electrons=(20-2)=18
No. Of neutrons=40-20=20.
Xo anytime an element has a positive ion,d no. Of electron 4rm d electronic config will b subtract 4rm positive ion

I'm innnn...lasuite represented!

Fetus: I'm innnn...lasuite represented!

uwc sir,i represent aaua

Any1 to try dis
the variatn in d rate constant at two dffrent temperature 4 d dcmpostn of
2HI~2I+H2 is gvn blw.
Kbase1=3.52*10^-7 at 555 kelvin nd kbase2=0.0395 at 781 kelvin.
1)what is d activatn energy
2)cal the exponential factor.

Mikebis: u wrng guy,take 4 example avin atomic mass of 40,atomic numb 20 of ca^2+.
No. Of protons=20
No. Of electrons=(20-2)=18
No. Of neutrons=40-20=20.
Xo anytime an element has a positive ion,d no. Of electron 4rm d electronic config will b subtract 4rm positive ion

@Kunlexic is right,check again.

Mikebis: Any1 to try dis
the variatn in d rate constant at two dffrent temperature 4 d dcmpostn of
2HI~2I+H2 is gvn blw.
Kbase1=3.52*10^-7 at 555 kelvin nd kbase2=0.0395 at 781 kelvin.
1)what is d activatn energy
2)cal the exponential factor.

1) 185.42KJ/mol
using ln(k1/k2)=(Ea/R){(T1-T2)/T1T2}
Ea is activation energy
T1 n T2 is temp1 n2 respectively
K1 is rate constant @T1
K2 is rate constant @T2
R is gas contant

No 2 in nxt post.

Mikebis: Any1 to try dis
the variatn in d rate constant at two dffrent temperature 4 d dcmpostn of
2HI~2I+H2 is gvn blw.
Kbase1=3.52*10^-7 at 555 kelvin nd kbase2=0.0395 at 781 kelvin.
1)what is d activatn energy
2)cal the exponential factor.

2) 9.96*10^10
Using lnK=lnA-Ea/RT
terms described in previous post.
A is exponential factor.

be unit consistent.

No questions ni?

More questions coming in...98% loading...

1.When gases react,they do so in volumes which bear a simple ratio to 1 another and to the volumes of the product if gaseius provided dat the temperature and pressure are constant
a.whose laws is stated above?
b.10cm^3 of carbon(ii) oxide were mixed with 15cm^3 of oxygen and exploded.After cooling to the original temperature,the volume was 20cm^3;after shaking with aqueous sodium hydroxide,the volume was reduced to 10cm^3.Show that these figures agree with the (1.) above.

denniece1:
@Kunlexic is right,check again.

i stll dsagri menh,he is nt rite.ok wat abt dis x^2+ avn electronic conf of 1s2 2s2 2p6 3s2 3p6 4s2.what is d atomic numb

denniece1:
@Kunlexic is right,check again.

the rule is wen avn a positv ion,d postv ion wll b subtrat 4rm d total value of d electronic conf,nd wen gvn negatv ion,it wll b added wt d elect conf,jst to get d atomic numb

Kunlexic: 1.When gases react,they do so in volumes which bear a simple ratio to 1 another and to the volumes of the product if gaseius provided dat the temperature and pressure are constant
a.whose laws is stated above?
b.10cm^3 of carbon(ii) oxide were mixed with 15cm^3 of oxygen and exploded.After cooling to the original temperature,the volume was 20cm^3;after shaking with aqueous sodium hydroxide,the volume was reduced to 10cm^3.Show that these figures agree with the (1.) above.

gay-lussac's law of combining volumes

Mikebis: 16 whch is oxygn

bro,i agre wit u,bt 16 iz nt d atomic num of oxygen..remember elements ar arangd basd on der atomic num...so d rit 1 iz sulphur...oxygen az an AN of 8

Kunlexic: 1.When gases react,they do so in volumes which bear a simple ratio to 1 another and to the volumes of the product if gaseius provided dat the temperature and pressure are constant
a.whose laws is stated above?
b.10cm^3 of carbon(ii) oxide were mixed with 15cm^3 of oxygen and exploded.After cooling to the original temperature,the volume was 20cm^3;after shaking with aqueous sodium hydroxide,the volume was reduced to 10cm^3.Show that these figures agree with the (1.) above.

its gaylusaac's law...
(2),.2Co+O2>2co2....frm d equatn abov,we can see dat 2moles of Co,reactd wit 1mol of o2,to giv 2 moles of co2...den,bt we wer given 10cm3 of co and 15cm3 o2...bt frm d equation,we onlyneed half d volum of co to react...xo 10cm3of co wil react wit 5cm3 of o2 to giv 10cm3 of co2..dat means...d volum of residual gas =volum of wastd o2 + volume of co2 formd...dats 10+10=20cm3...bt sinc Naoh iz aded..it wik absov al d co2 leavin us wit only 10cm3,....

Kendzyma: bro,i agre wit u,bt 16 iz nt d atomic num of oxygen..remember elements ar arangd basd on der atomic num...so d rit 1 iz sulphur...oxygen az an AN of 8

its a mistake,na atomic mass i wan put

1.Ammonia gas can be absorbed in the lab by using which compound?
2.what causes the inertness of nitrogen?
3.whèn NH3 replace the hydroxyl group of ethanoic acid,what is the name of the compound formed?

Mikebis: i stll dsagri menh,he is nt rite.ok wat abt dis x^2+ avn electronic conf of 1s2 2s2 2p6 3s2 3p6 4s2.what is d atomic numb

22

Mikebis: the rule is wen avn a positv ion,d postv ion wll b subtrat 4rm d total value of d electronic conf,nd wen gvn negatv ion,it wll b added wt d elect conf,jst to get d atomic numb

ok just reason @kunlexics quest..is there any tin lyk S^2+ since u say its sulphur(16).?

denniece1:
ok just reason @kunlexics quest..is there any tin lyk S^2+ since u say its sulphur(16).?

am still watching d guy,make he explain hw his own come be S^2+

Lateef9961: 1.Ammonia gas can be absorbed in the lab by using which compound?
2.what causes the inertness of nitrogen?
3.whèn NH3 replace the hydroxyl group of ethanoic acid,what is the name of the compound formed?

1.H2SO4
2 This coz of d strong triple bond btween the two atoms and those bonds are difficult to break...but it can still react with some elements like the alkaline earth metals to give nitride;with oxygen(eg the electric arc pocess);and with hydrogen to give ammonia(haber process)
.
3.bro du u mean ethanol?

@kunlexic,i min wen u draw d structural formular of ethanoic acid,the hydroxyl group below double bond of oxygen.

Lateef9961: @kunlexic,i min wen u draw d structural formular of ethanoic acid,the hydroxyl group below double bond of oxygen.

ohk bro,dat is ethanamide

Still observin oooo.....