Types of Reactions

Sierra Williams & Kynsi Gillis

A synthesis reaction occurs when two chemicals combine.

A + B → AB

Example

2 H2(g) + O2(g) → 2 H2O(g)
When a chemical reacts with Oxygen gas, a combustion reaction has occurred.
CxHy + O2 ---> CO2 + H2O

Examples

CH4 + O2 ---> CO2 + H2O
C2H6 + O2 ---> CO2 + H2O
Fire It Up - Combustion Reactions
During a decomposition reaction, a single compound breaks down into two or more elements.
AB ---> A + B

Example

2 H2O → 2 H2 + O2
Decomposition Reaction of potassium chlorate and sugar at Danville High School

    A single-displacement reaction is a type of oxidation-reduction chemical reaction when an element or ion moves out of one compound and into another - that is, one element is replaced by another in a compound.

AX + Y ---> YX + A

Examples

2HCl(aq) + Zn(s) → ZnCl2(aq) + H2(g)

CaI2(s) + Cl2(g) → CaCl2(s) + I2(s)

Single Replacement Reaction
A double displacement reaction, is a type of chemical reaction where two compounds react, forming two new compounds or products

AB + CD → AD + CB

Examples

Carbonic acid
H2CO3 (aq) → H2O (l) + CO2 (g)

Sulfurous Acid
H2SO3 (aq) → H2O (l) + SO2 (g)