3.2: Types of Reactions

A simple composition reaction is one with two or more simple elements that are combined to form a compound. 

Any compound can be broken down. Using the formation of water as an example, water can be decomposed as

2H₂O → O₂ +2H₂ 

When compounds are broken apart, energy is required. This mean that decomposition is generally endothermic. 

Combustion is just like you have grown up to imagine; there is an energy release and therefore it is exothermic. There are both fast acting, such as an explosion or burning, but there can also be slow rate combustions such as rusting. 

Thinking back to pH, when you have an acid and a base, they react to create a neutral solution. These are usually some form of salt and water. 

Acid + Base → Salt + H₂O

This is read as:

Magnesium Hydroxide plus 2Hydrochloric Acid produces Magnesium Chloride plus dihydrogen monoxide

Complete the assignment handout.