Double Replacement, Combustion and Neutralization Reactions

Double Replacement, Combustion and Neutralization Reactions


Double Replacement Reactions: When two compounds swap components in one of two ways... The anion of one compound may re- attach to the other compound and vice versa OR the cation of one compound may re-attach to the other compound and vice versa.

This reaction can be further simplified using a dancing analogy:

Two couples, comprised of two partners each (a man and a woman), are taking ballroom lessons.  The instructor later calls "switch" and the female partners switch and begin dancing with the other male partner.

A double replacement reaction can be modeled by this formula:

AB + XY ---> AY + XB

Examples:

KOH + H₂SO₄ ---> K₂SO₄ + H₂O
FeS + HCl ---> FeCl₂ + H₂S
NaCl + H₂SO₄ ---> Na₂SO₄ + HCl
AgNO₃ + NaCl ---> AgCl + NaNO₃




Combustion Reactions: Are essentially a kind of single replacement reaction which involves something burning in air.

It can be modeled by the following formula:

AB + O2  ---> CO2 + H2O

Examples:

CH_4(g)  +  2O_2(g)  →    CO_2(g)  +  2H₂O_(g)

2C₄H_10(g)  +  13O_2(g)  →    8CO_2(g)  +  10H₂O_(g)

_{Neutralization Reactions: Are essentially a kind of double replacement reaction which includes acids reacting with bases to produce H2o and an ionic salt.}

<sub>It can be modeled by this formula:


HA + BOH ---> H2O + BA


Examples:</sub>


HCl + NaOH --> NaCl + HOH

H₂SO₄ + 2 NH₄OH --> (NH₄)₂SO₄ + 2 HOH

2 NaOH + H₂CO₃ --> N₂CO₃ + 2 NaOH

Now, you must look at the "Activity Series". If the compound replacing the previous one is higher on the list, the reaction will occur. If it is lower, nothing will happen.

Here's a video that demonstrates how to do it: