Double Marriage Sets Fire To The Rain

Adele joke anyone? No? Okay.

Anyway...onto today's topic...Double Replacement

My grade 10 teacher always told me it's like your parents get divorced, and then marry your friends parents...


The General Form:
AB+CD  →  AD+CB

Rules
1. If there is a change in state there is a reaction.
2. If there isn't a change in state then there is no reaction.

How do we determine state change? I don't know...If you ask me who do I ask?

Just kidding, PinchOfKCN always has the answer (and if we don't, we actually just ask Google).

Step 1.Use your Table of Solubilities and look for the ANIONS in your reactants (not onion) in the left column.
Step 2. Look at the corresponding middle column cell to find the CATION.
Step 3. Now you should be able to find if it is Soluble or Not (Low) Soluble in the last column cell.
Step 4. If it is soluble, the product is aqueous (aq), if not soluble it is a solid (s).

There is a NET reaction when precipitation occurs. *No It does not mean rain, it means forming a solid*
The aqueous ions that are same on the both sides wipe each other out.
                          Eg.

Hey you, eyes downs here, I know this is boring and Adele's eyes are mesmerizing but we ain't done here.

I'm sure Adele knows a lot about Combustion. You know, setting fire to the...you know what nevermind.

Combustion is the a reaction when something is set on fire. In chemistry, this means reacting with Oxygen.

The General Form:
AB + O₂→ CO₂+H₂O


We'll be mostly dealing with burning Hydrocarbons (more on that later), so it makes things easy for us. An example of combustion is lighting methane(CH₄) on fire. 
CH₄ + O₂ → CO + H₂ + H₂O


On the right you'll see Charmander setting to the fire to the air.
Trivia: The fire on the tip of Charmander's tail is a measure of its life; if it goes out, it will die.



Last but not least, simple Neutralization.


Basically... acids + base > salt + water.
This is a special type of double replacement


The General Form:
HA + BOH  →   H2O + BA


An example: 
HCl + NaOH  →   NaCl + H2O

 Not one but many at the same time interesting...

I set fire to the rain!