Few Questions! (1 Viewer)

[wrxsti]

For the comparisons of batteries...is it alright if we learn 2...for eg.. the dry cell in comparison to the button cell, its gana be hard to learn all of them.

also in the second module...can someone tell what all the scientists discovered about the acid-base theories...my notes are complicated and jumbled

thxx

OMG OMG ANOTHER QUESTION SORRYYY

can someone list all the different ways of finding the no. of moles (like when given volume,mass,weight etc)

thx in advanced...any help and ill kiss ya

 

[twilight1412]

i cant answer your first question but your mole question i can
remember its always a ratio so

N = m/mm

n = number of moles
m = mass
mm = molecular mass

all in grams

note: if it is O2 then use the molecular mass for O2 not O

n = v/stpv

n = number of moles
v = volume
stpv = number of volume at standard temp and pressure

stp
volume is approximately 22.71L ><
temp is 0 degrees

 

[Nodice]

For the comparisons of batteries...is it alright if we learn 2...for eg.. the dry cell in comparison to the button cell, its gana be hard to learn all of them.

You only have to learn two cells: Either the dry cell or lead acid cell vs any other cell.

Lavoisier: Said that acids contained oxygen
Davy: Said that acids contained replaceable hydrogen
Arrhenius: Said that acids ionised to produce H+ ions in solution, whilst bases ionised to produce OH- ions. The degree to which they produce these ions determines the strength of the acid.
Bronsted-Lowry: Said that acids are proton donors and bases are proton acceptors. Acidity depends on both the acid and the solvent.