Types of Chemical Reactions
Types of Chemical Reactions
1. Synthesis Reactions
A+B → AB
1) When both A and B are elements;
e.g. 2 Na (s) + Cl2 (g) → 2 NaCl (s)
When Iron Rusts, 4 Fe (s) + 3 O2 (g) → 2 Fe2O3 (s)
2) When both A and B are compounds;
Two compounds can also combine to form one product.
2 SO2 (g) + O2 (g) → 2 SO3 (g)
3) When the reaction is between a compound and an element.
2. Combustion Reactions
The conditions for combustion:
(1) Something flammable;
(2) At the right temperature to ignite;
(3) Mixed with fresh air (oxygen).
There are two characteristic features of combustion reactions:
(1) Reactants include oxygen;
(2) Release a large amount of energy in the form of heat and light.
e.g. 2 H2 (g) + O2 (g) → 2 H2O (l)
Hydrocarbon
(1) An organic compound consisting entirely of hydrogen and carbon;
(2) When burning in oxygen, it generates carbon dioxide and water.
3. Decomposition Reactions
AB → A + B
A or B can not only be element, but also be new compound.
e.g. CaCO3