1. Chemical REactions

2. Chemical Reactions
Process that changes substances into different substances
The Atoms are rearranged in a chemical reaction

3. 5 main Types of Chemical Reactions
Synthesis Decomposition Single Displacement Double Displacement Combustion

4. Synthesis Reaction Two Elements join to form one compound
If it’s synthesis, write a compound that contains both elements. (Remember to balance the charges if it’s ionic)

5. Decomposition Reaction
A compound breaks down into smaller forms
If it’s Decomposition, you start with the element (the product) after the reaction, the (reactants) compound is broken down into smaller forms

6. Single Displacement
An element reacts with a compound to form a new element and a different compound. The reactant element “ displaces” an element in the compound that is more chemically similar. For example a metal will replace a different metal
An example is  Zn(s) + Cu(NO3)2(aq)    Cu(s) + Zn(NO3)2(aq) Note that the zinc metal takes the place of the copper ion in the compound. Zinc is more similar to copper than to nitrogen or oxygen.
An element displaces (replaces) part of a compound-Only if it is more reactive.

7. Double Displacement
During double replacement, the cations and anions of two different compounds switch places.
The elements of compounds displace (replace) each other in the compounds.
Example: Silver (Ag) and Potassium (K) switch places
And so in the reactant, Potassium bonds with Nitrate (NO3)
To form Potassium Nitride and Silver (Ag) bonds with Chlorine
To form Silver Cloride.
AgNO3(Aq) + KCl(Aq) --> KNO3(Aq) + AgCl(s) 

8. Combustion
. Good signsthat you are dealing with a combustion reaction include the presence of oxygen as a reactant and carbon dioxide, water and heat as products
Combustion usually occurs when a hydrocarbon reacts with oxygen to produce carbon dioxide and water.
CxHy+o2  Co2 + H2o
Combustion of Methane to make Carbon dioxide and water