formulae & reaction quantities

valency rule

valency rule

symbol valency swap divide formula

prefix rule

mon- 1 di- 2 tri- 3 tetra- 4 penta- 5 hexa- 6

ide

2 atoms present (except hydroxide * OH)

ite & ate

oxygen also present

Roman Numerals

I-1 II-2 III-3 IV-4 V-5 VI-6

how to tell valency on group ions

on the charge

ionic formula

write the chemical formula with charges

chemical equations

*ionic-(aq) *diatomic-(2) but only by itself (s)solid (l)-liquid (g)-gas do valency rule

gfm

add together the RAM of each element

calculation triangle 1

n,m,gfm

calculation triangle 2

n,c,v

% composition

m/gfm x 100

mass(g)

n x GFM

n(moles)

m/GFM

GFM(g)

n/m

N(moles)

c x v

c(mol-1)

n/v

v(cm3)(l)

n/c

convert cm3 in l

divide by 1000

only add charges

when it asks for ionic formula