Homework: 

Due Today: Balancing Equations worksheet

Due Tomorrow: Types of Reactions Worksheet

There is a quiz this Friday!

Today we learned about how to identify different kinds of chemical reactions. 

Synthesis Reactions: This is the first type of a chemical reaction. They occur when two substances combine and form a new compound. 

A+B ---> AB

Or to put it in terms of real elements: 

C + O2 ---> CO2

Or, as Mr. Lieberman showed us in class, a balloon filled with hydrogen and an oxygen-driven flame combine to form Hydrogen Peroxide (And an explosion).

2H2 + O2 ---> 2H2O2

                                            

                           

Decomposition Reactions: These occur when one compound separates into its separate elements. 

AB ---> A + B

Or, in elemental terms: 2 H2O ---> 2H2 +O2

Mr. Lieberman showed this to us by combining Sodium Chlorate with an oxygen flame to cause the Sodium Chlorate to become Oxygen and Sodium Chloride.

2NaClO3 ---> 3O2 + 2NaCl  

 

Single Replacement Reactions: These occur when one element replaces another in a compound. 

A metal can replace a metal or a nonmetal can replace a nonmetal.

A(metal) + BC(ionic compound) ---> B + AC

Mr. Lieberman showed us this reaction by showing us an aluminum can placed in Copper Nitrate. The Aluminum from the can goes into forming Aluminum Nitrate, and the Copper sinks to the bottom. The Aluminum switches places with the Copper.  

2Al + 3Cu(NO3)2 ---> 3Cu + 2Al(NO3)3       

Double Replacement: These occur when a metal replaces a metal in a compound and a nonmetal replaces a nonmetal in a compound. 

AB(ionic, aquarius compound) + CD( ionic, aquarius compound) ---> AD +BC

Mr. Lieberman showed us this by pouring Lead Nitrate into Potassium Iodide. The Lead bonds with the Iodine to form Lead Iodide, and the Potassium bonds with the Nitrate to form Potassium Nitrate. The Lead Iodide eventually will sink to the bottom of the test tube because it is a solid and the Potassium nitrate is a powder which will be dissolved in the water.

Pb(NO3)2 + 2KI ---> PbI2 + 2KNO3

Combustion: The last type of chemical reaction, these reactions occur when a hydrocarbon reacts with a hydrogen gas. This is also called burning. 

This will always happen with: CxHy(A hydrocarbon) + O2(Oxygen to burn it with) ---> CO2 + H2O. This will always happen with a hydrocarbon.

The Next Scribe is...... Benya C