Types of Reactions (continued)

Double Replacement

A reaction that occurs between 2 ionic compounds.
Usually happens in solution
The positive ions (cation) switch places

Formula:

 

e.g. 1 Na2CO3 + 1 CaCl2 --> 1 Ca CO3 + 2 NaCl

If there is a change in state, there is a reaction.
If there isn't a change in state, there is no reaction.

Use the "Table of solubilities" to determine states:

1. Find the anion in the left hand column
2. Look for cation in the 2nd column
3. Follow its presence or absence to the word "soluble" or "not soluble"
4. If soluble, the compound is aqueous (aq); If insoluble, the compound is solid (s)

There is a NET reaction when precipitation occurs

The aqueous ions that are the same on both sides get cancelled

Example:

For double replacement reactions (including neutralization), some ions participate in the reaction while others does not 

Combustion

A reaction that involves burning air

Formula:

AB + O2 --> AO + BO

Example:

Neutralization

A special double replacement reaction where acids react with bases to produce water and ionic salt
Acids have an H as the cation; bases have OH as the anion
Both should be aqueous

Formula:

HA + BOH --> H2O + BA

Example:

Recap:


The 6 types of chemical reactions include:

1. Synthesis
2. Decomposition
3. Single replacement
4. Double replacement
5. Combustion
6. Neutralization