Chemical formulae and chemical equations (CF) and (CE)

Copper (II)

cu2+

iron (II)

fe2+

iron (III)

Fe3+

Zinc

Zn2+

Silver

Ag+

Lead (II)

Pb2+

what is monatomic atom

contains one atom

formed from an atom

polyatomic atom

contains more than one atom

from group of atoms

hydroxide

OH-

Nitrate

NO3-

sulfate

SO42-

carbonate

CO32-

ammonium

NH4+

why do noble gases exist as monatomic gases

have fully filled outermost electron shell

do not need to gain or loose electrons to achieve stability

eg helium (He) and argon (Ar)

diatomic molecule

molecule of compound

only 2 atoms chemically combined

molecule of element

always comes in 2

N2, O2, H2

Water

H2O

ammonia

NH3

Methane

CH4

how to balance equations

balance metals

balance non metal ( compound )

balance hydrogen

balance oxygen Last, adjust coefficients to ensure both sides are equal.