A student while researching on electrolysis of water elucidates that, this process involves decomposition of water in the presence of electricity.
Write an activity demonstrating the procedure. How is this kind of decomposition different from photolytic and thermal forms of decomposition reactions? Elaborate your justification with chemical equations in each case. Also write the practical utility of each kind of decomposition reactions
Answers
Answer:
What is a decomposition reaction?
Decomposition is a type of chemical reaction. It is defined as the reaction in which a single compound splits into two or more simple substances under suitable conditions. It is just the opposite of the combination reaction.
In a combination reaction, a substance is formed as a result of chemical combination, while in a decomposition reaction, the substance breaks into new substances.
For example: The digestion of food in our body is accompanied by a number of decomposition reactions. The major constituents of our food such as carbohydrates, fats, proteins, etc.,decompose to form a number of simpler substances. These substances further react, releasing large amounts of energy, which keeps our body working.
The general equation that describes a decomposition reaction is:
Types of Decomposition Reactions
Decomposition reactions can be classified into three types:
Thermal decomposition reaction
Electrolytic decomposition reaction
Photo decomposition reaction
Thermal decomposition is a chemical reaction where a single substance breaks into two or more simple substances when heated. The reaction is usually endothermic because heat is required to break the bonds present in the substance.
Examples:
Photo decomposition is a chemical reaction in which a substance is broken down into simple substances by exposure to light (photons).
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