IEB Grade 12 Quantitative chemistry notes

1. Basicpartides
>
noble gases are metals made of atoms

>
covalently bonded substances are made of molecules

> ionic substances (salts ) are made of positive and
negative ions (formula unit =

single
group of ions
representing the salt formula )


2. Chemicalformulae


ammonium NHI
Mnoa
-




permanganate
nitrate NO 3-
-




nitrite Noa

hydroxide OH
-




chlorate [ 105

CH , COO
-




etnanoate
-




hydrogen carbonate HC 03

5042
-




sulfate

so }
-




sulfite

hydrogen sulfate Hsoci
co }
-




carbonate

52032
-




thiosulfate

dichromate crz OF
poof
-




phosphate


Atomic number (2) : number of protons in the nucleus of an atom


mass number (A) :
number of protons and neutrons in the nucleus of an atom