Inorganic Chemistry Answers

The LD50 for the ingestion pf HCN is 1.1 mg/kg. express this amount in ppm.

what is the amount of magnesium that would contain 1.20*10^24 particles? (Mg=24, Avogadro's constant+6.02*10^23)

Hello
Is water crystallization of salts ( salt hydrates ) a physical or a chemical change?
For example:CuSO4•5H2O - copper(II) sulfate pentahydrat
if you know any sources about this subject please introduce it to me
Thank you

can you please explain me reducing nature with example because i have studied some where that reducing nature means to liberate H+ ion .
so please clear my doubt.

Why is sulphide ore roasted before reduction

The empirical formula of glucose is CH20 which has a formula mass of 30 amu. if the molecular
mass of glucose is 180 amu. Determine the molecular formula of glucose.

The electro negativity of selanium is greater than oxygen..why..??.but the electronegativity of bromine is less than flourine..why..??

how to find basicity of compound:
1 CH3--CH2--NH2
2 (CH3)2 NH

what is meant by basicity and acidity of the compound .
how to find the basicity and acidity of the compounds?