₦airaland Forum

Pls let questnz rush in.

Vry correct!

emmyeuler1: KSP=[3X]^3[2X]^2....KSP=108X^5....SOLUBILITY=[KSP/108]^1/5....ANS(B)

U r on da way,bt itz inversely proportnal to square root of itz concentratn.dat meanz it wld increaz by factor 2,u really tried bro.

emmyeuler1: ANSWER TO QUE 2...molar conductivity is inversely proportional to concentration...Hence,molar conductivity will increase by 4...ans is (B)

2-regelatn,3-parallel connectns giv room for the same amount of voltage to pass through each applianc in wich da switchn-off of a applianc doez nt affect da otherz.in additn parallel connectn eliminates heatn of electric wires by the current,I^2Rt

joseboy199: A bullet fired vertically upward from a gun held 2.0m above the ground reaches its maximum height in 4.0s.calculate its initial velocity
2the phenomenon that shows that increase in pressure lowers d melting point can be observed in
3in homes,elecrical appliances n lamps are connected in parallel because
4)the electrical properties of germanium can be altered dratistically by d addition of impurities.these process is referred to as..
5)under wic conditions do gases conduct electricity

odaz hav bn answered by prof. Emmer.

1-s=ut + 1/2at^2,v z equal to zero.a=g,wich z equal to -10m/s2 as itz upward movement,then substitutn givz 20.5m/s2

joseboy199: A bullet fired vertically upward from a gun held 2.0m above the ground reaches its maximum height in 4.0s.calculate its initial velocity
2the phenomenon that shows that increase in pressure lowers d melting point can be observed in
3in homes,elecrical appliances n lamps are connected in parallel because
4)the electrical properties of germanium can be altered dratistically by d addition of impurities.these process is referred to as..
5)under wic conditions do gases conduct electricity

Let questns rush in plss,Y da boredom?

Ca3(po4)2 is a sparingly soluble salt in water.the molar solubility of the salt in termz of itz solubility product,ksp,is given by: a.[ksp/108]^1/3 b.[ksp/108]^1/5 c.[ksp/36]^1/3 d.[ksp/36]^1/5

(1)What happenz to the conductivity of an electrolyte as itz concentration reducez? It,a.decreasez b.is unaffected c.decreases d.reduces to zero (2)what happenz to da molar conductivity if da concentratn z reducez by a factor 4. It, A.increasez by 2 b.increasez by 4 c. Decreasez by 2 c.decreasez by 4

What happenz to the conductivity of an electrolyte as itz concentration reducez? It,a.decreasez b.is unaffected c.decreases d.reduces to zero

Ah,no o so far jamb cld ask what lucarz reagent z used for as test...2009 i cn remember.

emmyeuler1: BROS THIS IS ADVANCE OOO...THIS IS NOT JAMB SYLLABUS AT ALL...R.F=DIS MOVED BY SOLUTE 4RM BASE LINE/DIST MOVED BY SOLVNT 4RM BASE LINE TO BE CONTINUED IN MY NEXT POST

20cm3 of co are mixed and sparked with 200cm3 of air containing 21% of o2.what is the total volume of the resulting gases if all volumez are measured at s.t.p? A.179cm3 b.200cm3 c.210cm3 d.220cm3

Hmm,vry correct i lov dat.

emmyeuler1: CONTINUATION....r.f=distance moved by solute 4rm base ine/distance moved by solvent from base line........0.505=9.2/x.....x=18.2cm.....DISTANCE OF SOLVENT FRONT FROM TOP OF PLATE=19.2-18.2=1cm

Let questns com in plss!

I wil giv u a call.am demobobo on 2go,if u r there!

emmyeuler1: PLEASE CAN U GIVE ME UR NUMBER...MINE IS 08037841556...LET US RELATE....!

A chloroform solutn of pure organic compound was spotted at a distanc 0.80cm frm the base of a 20cm long chromatoplate.if the compound has the rf-value of 0.505 and movez half way up the 20cm long plate,what z the distance of the solvent front from the top of the plate upon elution?

Yeah,afta much argumnt on it...a lecturer said it isnt so for advnce dealns.i guez ur txt z fundament physcz

emmyeuler1: WHERE U ABLE TO CONFIRM THE FORMULA 4 ENERGY DENSITY BY BROWSING?...I WILL BE EXPECTING UR FEED-BACK

Chai,u r too correct!

emmyeuler1: NO. OF MOLE OF HCL=(50/1000)*0.10=0.005 moles.....NO. OF MOLE OF NaOH=(50/1000)*0.15=0.0075moles...THIS MEANS THE RESULTING SOLUTION WILL BE BASIC BY 0.0075-0.005=0.0025moles.....volume of resulting solution=50cm3+50cm3=100cm3=0.1dm3............molar conc of resulting soln=0.0025mole/0.1dm3=0.025mol/dm3...pOH=-LOG[0.025]=1.6...PH OF RESUL SLN=14-1.6=12.4

Ahh,'mentor?' sebi na u dae teach me nd correct me 4here.abeg mak pple no hear o,vry funny.

emmyeuler1: MY MENTOR U'RE CORRECT

1-A,2-C,3-C

larri: 1. Which of this is a materials for d smelting of iron ore in a blast furnace A.CaCO3 B.Zn(NO3)2 C.CuSO4 D.AlCl3 E. CaSo4
2.Which of this silver halide salt is readily soluble in ammonium hydroxide A.AgI B. AgBr C.AgCl D. AgF.
3. Chlorine,bromide and iodine resemble each other in that all A.dissovle in alkalis B. React violently with hydrogen without heating C.displace each other from solutions of their salts D.are gases E.are liquids.

Alkylmagnesiumhalides,CnH2n+1mgX WHERE X z da halide

emmyeuler1: what is the general formula for grignards reagent?

Hmm,u av really done gr8t..rearrange to giv interceptz E/r,i=(E-V) /r on da vertcl axis nd E,V=E-Ir on da horizontal axis

emmyeuler1: E-V=v....where v=ir=lost voltage,V=terminal p.d and E=emf....if follows dat E-V=Ir....HENCE,V=-Ir-E THEN Ir=-V-E....DIVIDING BOTH SIDES BY r gives I =V/r-E/r... COMPARING WITH EQUATION OF A STRAIGHT LINE Y=MX+C....Y=I,X=V,M=-1/r and C=-E/r....it going to be a graph with negative slope with intercept on both axis...ANS(B)

Hmm,i tnk itz energy over volume nau.chck it wel nt area.

emmyeuler1: ENENERGY DENSITY=ENERGY/AREA=(MLT^-2)(L)/L^2=MT^-2

Hmm,sam as pressur f/A:M/T^2L

emmyeuler1: WHAT IS THE DIMENSION OF ENERGY DENSITY?

Reversez inducd current nd thereby ensurez flow in sam directn.

emmyeuler1: WHAT IS ANOTHER NAME FOR A CUMMUTATOR AND WHAT IS IT USED FOR?

Correct!

emmyeuler1: ANS C

Correct

emmyeuler1: ANS IS C

Let questnz rush in.

I mean Wit appriciable interna resistnce

emmyeuler1: IT DEPENDS.... IF IT WERE OHMS LAW ,THE ANS IS A.... SINCE V=IR....BUT 4 A CELL THE ANSWER IS B

50cm3 of 0.10mol/dm3 Hcl solutn z mixed with 50cm3 of 0.15mol/dm3 NaoH Solutn.what z the pH of da resulting solution?

The compound formd when da two end alkyl groupz of propyl ethanoate are interchangd z,a.methyl propanoate b.ethyl propanoate c.methyl butanoat d.ethyl butanote

Ok,chemstry:the product of reactn btwn excez ethanol nd conc.H2SO4 at 145degcelsiuz is,a.ethene b.ethanoic acid c. diethysulphate d.ethoxyethane

Ok lemi ask ds:wotz da nature of the graph relatnshp btwn current nd voltage at verticl nd horizontal axiz respectvly?a.positive slope wit zero origin b.negativ slope wit intercptz on both axes c.positiv slope wit negativ nd positve intercepts on verticl nd horizntal axiz respectvly d.positv slope wit negtive nd positve intercptz on horizontl nd verticl axiz respctvly.