TYPES OF CHEMICAL REACTIONS
What Is Chemical Reaction?
Chemical reactions are the result of a chemical change where atoms are reorganized into one or more new arrangements.
IMPORTANT ⚠
Atoms (and thus mass) is conserved
The chemical bonding changes
The electrical charge is conserved
In a chemical change, the chemical composition of the sunstance changes; a chemical reaction occurs.
During a chemical reaction, a new substance is formed and chemical change alters the composition of the original matter
1- Combunation Reactions
A combunation reaction is a reaction in which simpler substances are combined into a more complex compund. That reactions are also called synthesis reactions.
EXAMPLES ⚠
1) 2 Mg (s) + O2 (g) → 2 MgO(s)
2) S (s) + O2 (g) → SO2 (g)
3) 2 Li (s) + Br2 (g) → 2 LiBr (s)
2- Decomposition Reaction
In a decomposition reaction, a single compound is broken down into two or more simpler substances.
EXAMPLES ⚠
2) CaCo3 (s) → CaO (s) + CO2 (g)
3) Ni(HCO3)2 (s) → NiCO3 (s) + H2O (l) + CO2 (g)
1) 2 NaN3 (s) → 2 Na (s) + 3 N2 (g)
3- Single-Replacement Reaction
A single-replacement reaction is a reaction in which a more active metal displaces another less active metal in a compound.
EXAMPLES ⚠
2) Ca (s) + 2 H2O (l) → Ca(OH)2 (aq) + H2 (g)
3) 2 Na (s) + H2O (l) → 2 NaOH (aq) + H2 (g)
1) Fe (s) + 2 HCl (aq) → FeCl2 (aq) + H2 (g)
4- Double-Replacement Reactions
In a double-replacement reaction, two ionic compounds in aqueous solution switch anions and produce an insoluble substance
EXAMPLES ⚠
1) BaCl2 (aq) + K2CrO4 (aq) → BaCrO4 (s) + 2 KCl (aq)
2) NaCl (aq) + LiNO3 (aq) → NaO3 (aq) + LiCl (aq)
3) Na2SO4 (aq) + BaCl2 (aq) → BaSO4 (s) + 2NaCl (aq)
5- Neutralization Reactions
A neutralization reaction is the reaction of an acid and a base.
EXAMPLE ⚠
Hx + BOH → BX + HOH
( Acid + Base → Salt + Water)
A neutralization reaction produces a salt and water
EXAMPLE ⚠
H2SO4 (aq) + 2 KOH (aq) → K2SO4 (aq) + 2 H2O (l)
EXAMPLE ⚠
6- Combustion Reactions
In a combustion reaction, carbon containing compounds, fuel burns in oxygen from the air to produce carbon dioxide, CO2, water, H2O, and heat or flame.
- They are generally rapid reactions that produce flames.
- Most involve oxygen as a reactant.
- Also involve a fuel that reacts with O2 to form one or more oxidized products.
EXAMPLES ⚠
3) C3H6O + 4 O2 → 3 CO2 + 3 H2O
2) C + O2 → CO2
1) CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (g) + energy