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Nairaland Chemistry Gurus by Kunlexic(m): 2:48pm On Sep 02, 2013 |
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 |
Re: Nairaland Chemistry Gurus by Fynestboi: 2:54pm On Sep 02, 2013 |
Sorry for the inconviniency |
Re: Nairaland Chemistry Gurus by Kunlexic(m): 11:59pm On Sep 02, 2013 |
Fynestboi: Sorry for the inconviniencythanks man |
Re: Nairaland Chemistry Gurus by Kunlexic(m): 12:04am On Sep 03, 2013 |
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. 1 Like |
Re: Nairaland Chemistry Gurus by Mikebis(m): 3:05am On Sep 03, 2013 |
Am in menh,am ready to solve any prob on chemistry nd to try ma best |
Re: Nairaland Chemistry Gurus by Kunlexic(m): 7:10am On Sep 03, 2013 |
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? |
Re: Nairaland Chemistry Gurus by Mikebis(m): 11:48am On Sep 03, 2013 |
Kunlexic: Answer did simple 116 whch is oxygn |
Re: Nairaland Chemistry Gurus by Kunlexic(m): 12:23pm On Sep 03, 2013 |
Mikebis: 16 whch is oxygnah 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. 1 Like |
Re: Nairaland Chemistry Gurus by Mikebis(m): 2:50pm On Sep 03, 2013 |
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 |
Re: Nairaland Chemistry Gurus by Fetus(m): 3:19pm On Sep 03, 2013 |
I'm innnn...lasuite represented! |
Re: Nairaland Chemistry Gurus by Mikebis(m): 4:24pm On Sep 03, 2013 |
Fetus: I'm innnn...lasuite represented!uwc sir,i represent aaua |
Re: Nairaland Chemistry Gurus by Mikebis(m): 4:28pm On Sep 03, 2013 |
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. |
Re: Nairaland Chemistry Gurus by denniece1(m): 5:54pm On Sep 03, 2013 |
Mikebis: u wrng guy,take 4 example avin atomic mass of 40,atomic numb 20 of ca^2+.@Kunlexic is right,check again. |
Re: Nairaland Chemistry Gurus by denniece1(m): 6:18pm On Sep 03, 2013 |
Mikebis: Any1 to try dis1) 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. |
Re: Nairaland Chemistry Gurus by denniece1(m): 6:26pm On Sep 03, 2013 |
Mikebis: Any1 to try dis2) 9.96*10^10 Using lnK=lnA-Ea/RT terms described in previous post. A is exponential factor. be unit consistent. |
Re: Nairaland Chemistry Gurus by Fetus(m): 8:32pm On Sep 03, 2013 |
No questions ni? |
Re: Nairaland Chemistry Gurus by Kunlexic(m): 9:16pm On Sep 03, 2013 |
More questions coming in...98% loading... |
Re: Nairaland Chemistry Gurus by Kunlexic(m): 9:29pm On Sep 03, 2013 |
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. |
Re: Nairaland Chemistry Gurus by Mikebis(m): 9:38am On Sep 04, 2013 |
denniece1: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 |
Re: Nairaland Chemistry Gurus by Mikebis(m): 9:41am On Sep 04, 2013 |
denniece1: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 1 Like |
Re: Nairaland Chemistry Gurus by Mikebis(m): 9:47am On Sep 04, 2013 |
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 constantgay-lussac's law of combining volumes |
Re: Nairaland Chemistry Gurus by Kendzyma(m): 10:03am On Sep 04, 2013 |
Mikebis: 16 whch is oxygnbro,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 |
Re: Nairaland Chemistry Gurus by Kendzyma(m): 10:14am On Sep 04, 2013 |
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 constantits 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,.... |
Re: Nairaland Chemistry Gurus by Mikebis(m): 11:17am On Sep 04, 2013 |
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 8its a mistake,na atomic mass i wan put |
Re: Nairaland Chemistry Gurus by Lateef9961(m): 12:14pm On Sep 04, 2013 |
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? |
Re: Nairaland Chemistry Gurus by denniece1(m): 1:33pm On Sep 04, 2013 |
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 numb22 |
Re: Nairaland Chemistry Gurus by denniece1(m): 1:48pm On Sep 04, 2013 |
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 numbok just reason @kunlexics quest..is there any tin lyk S^2+ since u say its sulphur(16).? |
Re: Nairaland Chemistry Gurus by Kunlexic(m): 3:52pm On Sep 04, 2013 |
denniece1:am still watching d guy,make he explain hw his own come be S^2+ |
Re: Nairaland Chemistry Gurus by Kunlexic(m): 4:36pm On Sep 04, 2013 |
Lateef9961: 1.Ammonia gas can be absorbed in the lab by using which compound? 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? |
Re: Nairaland Chemistry Gurus by Lateef9961(m): 4:49pm On Sep 04, 2013 |
@kunlexic,i min wen u draw d structural formular of ethanoic acid,the hydroxyl group below double bond of oxygen. |
Re: Nairaland Chemistry Gurus by Kunlexic(m): 5:05pm On Sep 04, 2013 |
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 |
Re: Nairaland Chemistry Gurus by Fetus(m): 6:30pm On Sep 04, 2013 |
Still observin oooo..... |
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