No 2...i misread the question...am suppose to use debrogile equation... Lamda= h/mv...mistake on my part....

How can I calculate pH without using calculator

Gracy3535:
Guys pls ve been trying to understand hybrization of orbital but it not going any simple defination of it.

..it is the mixing or blending of orbital to av orbital of the same energy or to av the same degeneracy...p orbital has slightly higher energy than s orbital..but when hybridize,they will both have the same energy...a new orbital is form different from the original s
and p orbital..the new name of the orbital is now called sp orbital...we have sp,sp^2( called sp two not sp square) also sp^3....

dolapo74:
How can I calculate pH without using calculator

..u just need smartness..pH of 0.001= 10^-3..since.pH= - log[H^+]..pH =3....but there are some compicacated one...for dat u av to b smart too...like pH of 3.4 x 10-4....u can just treat it as 1.0 x 10^-4....u get 4.....u will now say....4 - log 3.4...I don't knw log 3.4..but I knw is "0.something".. I knw my answer will be BTW 4 and 3...like 3.1 - 3.9...actually the answer is 3.5......so its just smartness

Eben331:
1 A ball of mass 1kg is dropped from a height of 5m onto a floor and rebounds to a height of 1m. Find the loss of kinetic energy due to impact. (g=9.8m/s2) 2 An electron of mass 9.4*10^-31kg has a wavelength of 1.3*10^-10m. Calculate the velocity of the electron. (h=6.6*10^-34Js) 3 A compound microscope, with lenses of focal lengths of 3cm and 5cm for the objective and eyepiece respectively, has an object placed 2cm from the objective lens. If the first image formed 3cm from the eyepiece lens, calculate the distance of the final image from the eyepiece. Happy Weekend Bosses.

....no 3....fe= 5cm..Ue = 3cm...Ve=?...so lens formula...
1/f=1/u + 1/v....1/5=1/3 + 1/v...1/v= 1/5 - 1/3 ...Ve = -15/2 = -7.5m....
D way I think it is DAT the image of the objective lens form the object distance of the eyepiece ...

Eben331:
I got 3.83m/s.

Wrong.

Diethyl ether is produced from ethanol according to the following equation.
2Ch3ch2oh------->CH3cH2OcH2cH3+ H2o
calculate the percentage yield of 50.9g of ethanol react to produce 24.0g of ether. thanks for solving.

Damayogenius18:
..u just need smartness..pH of 0.001= 10^-3..since.pH= - log[H^+]..pH =3....but there are some compicacated one...for dat u av to b smart too...like pH of 3.4 x 10-4....u can just treat it as 1.0 x 10^-4....u get 4.....u will now say....4 - log 3.4...I don't knw log 3.4..but I knw is "0.something".. I knw my answer will be BTW 4 and 3...like 3.1 - 3.9...actually the answer is 3.5......so its just smartness

I get your point .Thank you so much

Gracy3535:
Guys pls ve been trying to understand hybrization of orbital but it not going any simple defination of it.

Hybridization is the mixing of two or more orbitals of the same principal quantum number to give a new set of orbitals that are exactly equivalent. TYPES OF HYBRIDIZATION (1) sp three eg alkane (2) sp two eg alkene (3) sp eg alkyne.

dolapo74:
How can I calculate pH without using calculator

You have to knw standard form.

vicstiqs95:

Wrong.

correction pls

Damayogenius18:
M sori guys..today was just somehow...here is a question...A light square wire frame each side is of which is 10cm long held vertically in water in with one side touching the water surface...find the additional force necessary to pull the frame clear the water...(T= 0.07).. A..0.3N..B 0.015N C..0.04N..D0.4N
2..A thin wire is bent in the form of rectangle of length 4m and breadth 3m...what force due to surface tension does the side experience when a soap film is formed in the frame( ST of soap = 0.03N/m)...A..0.107...B...0.0026..C..0.0084...D..0.023..

correction pls

(1) A man can row a boat at 4km/hr in still water. He rows the boat 2km upstream and 2km back to his starting place in 2 hours. How fast is the stream flowing? (2) A swimmer is capable of swimming at 1.4m/s in still water. (a) How far downstream will he land if he swims directly across a 180m wide river? (b) How long will it take him to reach the other side?

Damayogenius18:
....no 3....fe= 5cm..Ue = 3cm...Ve=?...so lens formula...
1/f=1/u + 1/v....1/5=1/3 + 1/v...1/v= 1/5 - 1/3 ...Ve = -15/2 = -7.5m....
D way I think it is DAT the image of the objective lens form the object distance of the eyepiece ...

correct!

To all social scientists: Follow this link to join my WhatsApp group: https:///GoCqyMHpKQz0TPF6lN7OMf

Gracy3535:

when u r through wit them come and collect ur cane

..lol..I miss u guys too.. But from Monday..I will always come online at 2am....

vicstiqs95:
A simple pendulum oscillate with an amplitude of 30° if the length of the string is 1.0m. calculate the velocity of the pendulum Bob at its lowest point.

...conservation of energy....
Mgh = 1/2mv^2....m cancel...so gh=1/2v^2....
v=√2gh...but h= l - l cos teta....h= l (1-cos teta)
h=1(1 - 0.866)..h=0.134...
v=√2 * 10 *0.134...
v=1.637m/s

Damayogenius18:
..lol..I miss u guys too.. But from Monday..I will always come online at 2am....

tanx cos i really need ur help. Ve gotten new skul phy. Pls take a pix of science phy

please, do you guys have a whatsapp group?

Gracy3535:
tanx cos i really need ur help. Ve gotten new skul phy. Pls take a pix of science phy

...send ur number to me trough mail..I will send it to u via WhatsApp...no need

Eben331:
(1) A man can row a boat at 4km/hr in still water. He rows the boat 2km upstream and 2km back to his starting place in 2 hours. How fast is the stream flowing? (2) A swimmer is capable of swimming at 1.4m/s in still water. (a) How far downstream will he land if he swims directly across a 180m wide river? (b) How long will it take him to reach the other side?

..no 2...the question is not complete or perhaps I don't understand it....I think u should give the speed of the river....even If u don't give it,u should give the angle the boat made wit the shore..

Eben331:
(1) A man can row a boat at 4km/hr in still water. He rows the boat 2km upstream and 2km back to his starting place in 2 hours. How fast is the stream flowing? (2) A swimmer is capable of swimming at 1.4m/s in still water. (a) How far downstream will he land if he swims directly across a 180m wide river? (b) How long will it take him to reach the other side?

..no 1..Velocity of boat related to shore= 2km/ 2hrs = 1km/hr...Velocity of boat related water=4km/hr...velocity of water related to shore= 4^2 - 1^2...
v^2 = 16 - 1. ..v = √15...=3.87km/hr

Eben331:
(1) A man can row a boat at 4km/hr in still water. He rows the boat 2km upstream and 2km back to his starting place in 2 hours. How fast is the stream flowing? (2) A swimmer is capable of swimming at 1.4m/s in still water. (a) How far downstream will he land if he swims directly across a 180m wide river? (b) How long will it take him to reach the other side?

...no 2..a is not complete...b is t = 180/1.4..=129s..so it will b easier to calculate "a" if the rate of flow of the river is given....dx= speed of river/ 129s....dx= how far downstream....I could av also calculated the speed of river using pythagoras if you av given me the angle the boat made with the shore...I stand corrected o...I may be wrong..

Damayogenius18:
..it is the mixing or blending of orbital to av orbital of the same energy or to av the same degeneracy...p orbital has slightly higher energy than s orbital..but when hybridize,they will both have the same energy...a new orbital is form different from the original s
and p orbital..the new name of the orbital is now called sp orbital...we have sp,sp^2( called sp two not sp square) also sp^3....

tanx

Eben331:
Hybridization is the mixing of two or more orbitals of the same principal quantum number to give a new set of orbitals that are exactly equivalent. TYPES OF HYBRIDIZATION (1) sp three eg alkane (2) sp two eg alkene (3) sp eg alkyne.

tanx

Damayogenius18:
...send ur number to me trough mail..I will send it to u via WhatsApp...no need

am nt on whatsapp

please , will ui take pharmacy this year?

briX1:
please , will ui take pharmacy this year?

briX1:
please , will ui take pharmacy this year?

briX1:
please , will ui take pharmacy this year?

They should, just wait till they talk abt it on their portal

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Damayogenius18:
..no 1..Velocity of boat related to shore= 2km/ 2hrs = 1km/hr...Velocity of boat related water=4km/hr...velocity of water related to shore= 4^2 - 1^2...
v^2 = 16 - 1. ..v = √15...=3.87km/hr

wrong[color=#990000]

Damayogenius18:
..no 1..Velocity of boat related to shore= 2km/ 2hrs = 1km/hr...Velocity of boat related water=4km/hr...velocity of water related to shore= 4^2 - 1^2...
v^2 = 16 - 1. ..v = √15...=3.87km/hr

wrong

Damayogenius18:
..no 1..Velocity of boat related to shore= 2km/ 2hrs = 1km/hr...Velocity of boat related water=4km/hr...velocity of water related to shore= 4^2 - 1^2...
v^2 = 16 - 1. ..v = √15...=3.87km/hr

wrong

Eben331:
[color=#990000][/color] They should, just wait till they talk abt it on their portal

thank you

Eben331:
Damayogenius18, show us the corrections to your questions, we dont knw them.

..I will bro...solve d relative question....