Chapter 1: Chemical reactions and equations

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Chemical reactions and equations


Explain the following terms with one example each:

(a) Corrosion

(b) Rancidity


(a)- Corrosion of metal is a redox reaction in which a metal is oxidized naturally to its ions, resulting in the partial or complete destruction of the metal. In corrosion, both oxidation and reduction take place simultaneously which leads to the formation of rust. The rust is the hydrated ferric oxide. The chemical equation for the formation of rust is shown below:

4Fe (s) + 3O2 (g) + 2xH2O (l) → 2Fe2O3.xH2O (s)


(b)- The process by which the substance containing oils and fats are exposed to air they get oxidized and changes its smell, taste, and colour called rancidity. The substance which reduces the oxidation of food and prevents its deterioration is called antioxidant. The nitrogen gas is an inert gas that acts as an antioxidant and prevents the oxidation of food. So, nitrogen gas is added in the bag of chips.

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