Occur only in living organisms.
Create and destroy atoms.
Only occur outside living organisms.
Produce new substances.
Shows the spectator ions.
Shows only those particles involved in the reaction.
Is not necessarily balanced with respect to mass or charge.
Shows dissolved ionic compounds as dissociated free ions.
Heat is supplied to the reaction.
A catalyst is needed in the reaction.
Electricity is need in the reaction.
A precipitate will form during the reaction.
(aq), dissolved in water
(s), solid product
P (s) + O2(g) -->P O2 (g)
P(s) + O2(g) --> P5 O2 (g)
P(s) + O2(g) -->P2 O5 (s)
P2 O5 (s) --> P2 (s) + O2 (g)
The ways in which atoms are joined together is not changed.
New atoms are formed as products.
The final substances are called reactants.
Bonds between atoms are broken and new bonds are formed.