Types of reactions

• The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories
• Roasting is a process of metallurgy where ore is converted into its oxide by heating it below its melting point in the presence of excess air. While calcination is mostly used in the oxidation of carbonates, roasting is a method that is used for converting sulphide ores.
• A redox reaction can be identified if there is a change in oxidation number between reactants and products. If the sum of all oxidation numbers changes, then a redox reaction has occurred.
• In a redox reaction, electrons are transferred from one atom or molecule to another. The substance losing electrons is called an oxidizing agent (or oxidant) while the substance gaining electrons is called a reducing agent (or reductant).
• Reduction is when an atom gains electrons or loses oxygen (or another element). Reducing agents donate electrons to other substances.
• In a redox reaction, both reduction and oxidation occur simultaneously.
• Oxidation is when an atom loses electrons or gains oxygen (or another element). Oxidizing agents accept electrons from other substances.
• Oxidation state is defined as the charge on an atom when it is separated from other atoms in a compound. It is also known as oxidation number.
• An ionic bond occurs when two oppositely charged ions attract each other due to electrostatic forces. This attraction results in the formation of an ionic compound.
• Oxidation is when an atom loses electrons or gains oxygen (or another element). Oxidising agents accept electrons from other substances.
• An example of a redox reaction is rusting iron. Iron atoms lose electrons and gain oxygen atoms to form iron(III) oxide (rust)