₦airaland Forum

ANDREW2EIC: Am biased towards option a) cos when they react with carboxylic or alkanoic acids they give out water. Is that correct?

good trial,but the best option is (c)
carbonyl group react with hydrazine and its derivatives known has condensation reaction.......
RRC{O + H2}N3....

1)Which of there undergoes condensation reaction
a)alkanol
b)amine
c)alkanal
d)haloalkane
2)which of the following react with NaOH to give double salts?
a)S02
b)S03
c)P04
d)N02

A particle in a straight line specified by the equation y=4t^4 - 3t^3.find the acceleration after 3 seconds.

@fynestbarrister
a sum of #500,it comprises all my subject combination

ANDREW2EIC: Attempt this:

A concave mirror of radius of curvature 30cm produced an inverted image 4 times the size of an object placed perpendicular to the axis. Determine the position of the object.

focal lenght=15
mirror's equation=>1/f=1/u + 1/v
since the image produced is 4 times the object.therefore 1v=4u.
So, 1/15=1/u + 1/4u
u=75/4
u=+18.75cm(since it's a concave mirror)

@fynestbarrister ekiti, .... someone from oau bought it and sent it to me...

......WE ARE SORRY,WE JUST HAVE TO CLOSE THIS THREAD!!!

@fynestbarrister,me don get the oau series ooo

fynestbarrister: by GODS GRACE

WHAT OF ENGLISH?

THREAD CLOSED !!!
THREAD CLOSED !!!
THREAD CLOSED !!!

THREAD CLOSED !!!

buzyguy: Dat optn b z incorrct cuz i thnk copper z used instead of iron

yes you're wright,that was an error....duralunium=cu,mg,mn,al

topsonkay: Ijn. 300 jamb scores for we all. Can i hear anybody saying "Amen"

AMEN,AMEN,AMEN,AMEN......

What is the composition of the alloy duraluminium.
a)al,cu,co,fe
b)al,mg,mn,fe
c)al,ni,c,di
d)al,Na,fe,zn

in a light spectrum,which colour has the highest speed?
a)green
b)red
c)blue
d)violet

buzyguy: Which molecule hz da least chemical reactivity?a.N b.Cl c.O d.iodine

a N2 requires +3 which is the highest in the above list to obtain a stable octet configuration

buzyguy: Which of the follown atoms has the follwn,n=3,l=0,m=3orbitals,s=+1/2 or -1/2?a.Na b.Ne c.Al d.Si

the value of L can't be 0 since n=3,so L must be definately =2

ANDREW2EIC: Perhaps u were wrong. I think u unnecessarily prolonged a simple work.
Below is my little explanation to the question:

When a force f(N) is applied on a body of mass m(kg) for a given period of time t(s), the body gains momentum i.e, the massive body moves forward with a certain velocity. The gain in momentum is as a result of force which acts with time. With the already established fact, i can safely say that the gain in momentum is also as a result of impulse on the body. I believe u still remember that impulse is mathematically expressed as: force x time, ft. From law of conservation of energy, energy exhausted for exerted force on the body for a period of time = energy gained by the body to give it momentum.

Hence, impulse = momentum gained, i.e, ft = mv (where m=mass of the body, v = velocity gained. Of course, f is force and t is time taken)

Relating my explanation with the problem at hand, we have:

force exerted by the footballer = 30N, time taken = 0.05s, mass of ball = 0.075kg, velocity= ?.
Substituting:
30x0.05 = 0.075xV, 0.075V = 1.5 (divide both sides by 0.075)
0.075V/0.075 = 1.5/0.075
V = 20m/s.
Therefore, the velocity gained by the ball is 20m/s.

N:B, i only elaborated this much for u to understand what really happened, not that the question is really that difficult.

Hope that helps!

wao @andrew,i've gained from that explanation of yours...
I think it can also be solved this way,
from the law of conservation of energy { F=Mv/t}
since f=30N,M=0.075kg,t=0.05
then make v the subject of the formula and solve.the final answer will be 20 N/s

olatosina: which of dis has banana smell
a. CH3COOC5H11
b. CH3COOC8H17
c. CH3COOC3H7
d. CH3COOC6H13

i think is A

olatosina: love u guys. Take dis.
which of dis do not react with N02
a. Sulphur nd candle
b. Ammonia nd lead
c. Copper nd benzene
d. Tetrachloromethane nd nephtaline

A

mayorall: Which of the following will undergo substitution reaction?

A. C4H8
B. C7H16
C. C2H4
D. C8H16

B (From alkane CnH2n+2)

buzyguy: Sodium metal is easier to cut with a knife than a calcium metal bcus,a.its found in group 1 b.its nt totally considered as metal c.its soft d. its crystals r planar in shape

it's soft,(property of group 1 metal)

buzyguy: Watz da funtn of calcium fluoride in the xtractn of ca?a.to prevent damag of electrdes b.to raise da meltn point of da electroly c.for economic purpose d.to reduce the rate of da reactn

i think CaF reduces the melting point during extraction of Ca

buzyguy: Watz da funtn of da mixture of argon-nitrogen in filling lamp filament or bulb?a.prevents reductn by air b.prevents oxidatn by co2 c.prevents blackening d.prevents rustn of da filament

i think there are two answers there,1=it prevent oxidation in filament lamp and then prevent blackening.but it seems both have thesame meaning chemicaly

Michaellegend: The first stage of treatment of water for township supply is sedimentation.

the first stage is coagulation i.e flucking together the dirts followed by sedimentation=selling of the dirt,followed by filtration=removal of dirt followed by disinfection=treatment of water by chlorination or any other means before it is supplied to town...

edreesabiodun: Which of the following is insoluble in water a) ethanol b) HCl c) ether d) NH3. (2) which of the ffg will form a white precipitate with AgNO3 a) Butane b) ethene c) ethyne d) benzene 3)ethene will change the colour of KMnO4 from purple to what in an alkaline medium a)brown, b)yellow c)green d) reddish brown

as for me,i think kMn04 is always decolourized from purple to colourless via additional reaction with ethene

buzyguy: Benzene is sp2 hybridized while ethyne is sp hybridized.the more the pi-bond encounterd the more the reactivity.the pi-bond distorts da shape nd increase da bond angle by reducing the repulsion btwn da molecules.hop itz wel clear!

you're correct.besides,what school are you aspiring and what course?

Simplefemo: A man stands one-third of the way between two walls and claps his hands.
He hears two distinct echoes 1second apart.
If the speed of sound is 330ms`1 the distance between the walls is A. 33m B. 110m C. 220m D. 330m E. 495m

echo=2v/d
. : v=330/1=330m/s
2=2*330/d
d=660/2
. : d=330m
since the question says 1/3 of d,
d=1/3 * 330
d=110m
ansB)

Simplefemo: B- The concentration increases i.e the higher the temperature, the higher the concentration

you're wrong sir

When a solution containing a concentrated HCl is heated,the solution
a)remain costant
b)the concentration increases
c)the solution becomes dilute
d)the solution explode.

Simplefemo: The answer is A
Bauxite is to Aluminium
Galena to lead
Gypsum to Calcium

correcttttttttttt@atesunate and simplefemo

Which of the following is the ore of cupper?
A)malachite
b)bauxite
c)galena
d)gypsum

Simplefemo: Lucas reagent is used to test for
A. Alkanes
B. Alkanoic acid
C. Alkanols
D. Amines

C
(alkanols)