Types of Reactions Solutions Unit

Redox (Reduction/Oxidation)

Remember: LEO the lions says GERRRRRR! What is Redox? 30/09/99 REDOX stands for REDuction/OXidation Oxidation is often thought of as a combination of a substance with oxygen (rusting, burning) Oxidation refers to a loss of e- Reduction refers to a gain of e- Remember: LEO the lions says GERRRRRR! Loss Electrons = Oxidation Gain Electrons = Reduction

Reactions Fe --> Fe+3 +3e- What is happening to the Fe atom? Fe is going from 0 to +3 oxidation # It must be losing electrons Loss of Electrons = Oxidation In conclusion, the iron atom is being oxidized

In conclusion, the sulfur atom is being reduced Reactions S +2e- --> S-2 What is happening to the Sulfur atom? S is going from 0 to -2 oxidation # It must be gaining electrons Gain of Electrons = Reduction In conclusion, the sulfur atom is being reduced

Acid/Base Reactions

Neutralization In general: Acid + Base  Salt + Water All neutralization reactions are double displacement reactions. HCl + NaOH  NaCl + HOH

Precipitation Reaction Reactions that form a precipitate Precipitation Reaction

Definition: Precipitate: A solid that forms as the result of a chemical reaction in aqueous solution.

Precipitation Reaction: A reaction in which a solid is formed from a solution is called a precipitation reaction Solid = precipitate = insoluble

Solubility – Why does it matter? A precipitation reaction only occurs if one of the products is insoluble.