stoichiometry (Jack)

chemical equation

relative atomic mass

the mole

fmormula

Relative atomic mass (Ar) is the average mass of isotopes of an element
compared to mass of carbon-12 atom.

The carbon-12 has a mass of exactly 12 units.

Finding the masses of molecules and ions

Relative molecular mass (Mr) is the sum of the relative atomic masses in a
molecule.

Mr =the atom (relative number )x number of atom

Chemical equations have two process it is a arrow react to product Chemical equations are further classified into two types ， word equation and symbol equation

Word equation represents the chemical species involved in a chemical reaction as
chemical names.

Symbol equation Symbol equation represents the chemical species involved in a chemical reaction as
chemical formula

mass =mole x molar mass(g/mol)

Naming binary compounds Compounds that contain a metal and a non metal(ionic bond)

Compounds that contain two non metal (covalent bond

Ammonium (NH4+)

Nitrate (NO3-)

Hydroxide(OH-)

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volume（必须dm3 v） =n x 24 (n是摩尔）

c x v 除以1000 =摩尔n v必须cm3