Jan 27 2011 - Types of Reactions

Today we went over types of reactions.

We learned about three types of reactions that are synthesis, decomposition and single replacement.

1. Synthesis

This reaction is combination of two or more reactants to form one product.

A + B -> C

Ex. 2H2 + O2 => 2H2O

2. Decomposition

In this reaction, a compound is broken down into two or more products.

A -> B + C

Ex. 2H2O => 2H2 + O2

3. Single Replacement

Single replacement is when an element replaces another in a compound. (metal elements replace positive ions and non-metal elements replace negative ion)

A + BC -> AC + B (A=metal)

A + BC -> BA + C (A=non-metal)

Ex.

Metal - Zn + CuCl2 => ZnCl2 + Cu

Non-Metal - Cl2 + NaBr => NaCl + Br2

Predicting Single Replacement Reactions

An element highes up on the series replaces the ion below it on the table.

Ex. 2Li + MgCl2 => 2LiCl + Mg

Zn + CuCl2 => ZnCl2 + Cu