February 2nd

Last time, our friends Oxygen and Sodium demonstrated Synthesis, Decomposition, and Single Replacement with you. But did you know that there are three more reaction types still untouched on?

DOUBLE REPLACEMENT

Double replacement is when two compounds swap positive ions to create two whole new products.

Examples:

4Rb₃PO_4(aq) + 3Ti(NO₃)_4(aq) ----> 12RbNO_3(aq) + Ti₃(PO₄)_4(s)

2NH₄I_(aq) + MgSO_4(aq) ---->  (NH₄)₂SO_4(aq) + MgI_2(aq)



The general form for double replacement reactions is AB + CD --> CB + AD.

COMBUSTION

Combustion happens when substances burn in the air to produce carbon dioxide.

Examples:

C₁₀H₈ + 12 O₂ ----> 10 CO₂ + 4 H₂O

2C₃H₆ + 9O₂ ----> 6CO₂ + 6H₂O

The general form for combustion reactions is AB + O2 --> AO + BO.

NEUTRALIZATION

Neutralization is a reaction in which an acid is combined with a base to produce water and a salt.

2HCl _(aq) + Ca(OH)_{2 (aq)} ----> 2H₂O_(aq) + CaCl_2(l)

HCl + NaOH ----> NaCl + H₂O

The general form for a neutralization reaction is HA + BOH --> H2O + BA.

JUST FOR FUN:

CLICK HERE for the Identify the Reaction game: where you can use your chem knowledge to win a "thrillion" dollars!