prove the formula K.E.=1/2mv²

calculate the molar mass of CO2, H2SO4, NaCl?

what is meant by tetra atomic and poly atomic?

I want all elements' symbols with their valencies and atomicity.

Calculate the number of moles in 52 g of helium gas ?

what are polyatomic ions?give examples

 what is the difference between nitrate,nitride,nitrite?

 what were the drawbacks of Daltons atomic theory?

 if the isotopic distribution of C-12 and C-14 is 98% and 2% respectively, the number  of C-14 atoms in 12 g of carbon is

a)1.032x10²² 

b)1.032 x 10²³

c)3.88 x 10²²

d)1.302 x 10²²

and pls explain

What is the difference between O2 and 2O?

if one mole of carbon atoms weighs 12g what is the mass of 1 atom of carbon?? plss explain....

why atomic mass of some element  are in fraction

what is the atomicity of phosphorous?and valency?

explain dalton's atomic theory and write its drawbacks

Is there any trick to learn Valency?