Classifying Chemical Reactions

Synthesis Reactions

a chemical reaction in which 2 or more reactants combine to form a new product.represented by general formula:A + B AB or +

here, 2 reactants combine to form one product.

Example: Haber Process

An important product made by a synthesis reaction is ammonia NH3

It is used as a fertilizer to optimize crop yields, making paper, extracting nickel and zinc, in explosives, and cleaning products.Fritz Haber (German) patented a process for making ammonia:N2(g) + 3H2(g) 2 NH3(g)

Sample Problem

Problem: Complete and balance the synthesis reaction:

Na(s) + Cl2(g) _____________Step 1: What is the reaction type?___________________________________Step 2: Use ion charges to make the most likely product.

Step 3: Write the equation, and balance

Sample Problem

Decomposition Reactions

a chemical reaction in which a compound breaks down into 2 or more products.General chemical equation:AB A + B or +

reactants will always be a compoundlike the reverse of a synthesis reaction

Example 1: Making Hydrogen

making hydrogen from waterthe development of hydrogen as a source of fuel, relies on the ability to make it from water in a process called electrolysis.2H2O (l) 2H2(g) + O2(g)electrical current is used to break the bonds between hydrogen and oxygen.

Example 2: TNT (explosive)

2C7N5N3O6(s) 3N2(g) + 5H2O(g) + 7CO(g) + 7C(s)

Rapid expansion of these gases pushes material away from the blast site, producing an explosion

Sample Problem

AgCl(s) _______________Step 1: What type of reaction?____________________________________Step 2: What do each of the elements look like on their own? Remember to write the state!____________________________________

Sample Problem

Step 3: Write the equation and balance

You try it!!

Pg. 184 #1, 2Pg. 185 # 1 – 4Pg. 187 # 1-3