Question

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What is a decomposition reaction? Give an example. Describe an activity to illustrate such a reaction by heating. ​

Answer 1

Explanation:

Here we can see that electricity is being passed through liquid water to help it decompose into its constituting components hydrogen and oxygen. ... An example of a thermal decomposition reaction is the formation of lead oxide, nitrogen dioxide and oxygen on heating lead nitrate.

Answer 2

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• Decomposition reactions are processes in which chemical species break up into simpler parts. Usually, decomposition reactions require energy input. For example, a common method of producing oxygen gas in the laboratory is the decomposition of H2O by electricity.

$\large\mathsf{ H_2 O \longrightarrow H_2 + O_2}$

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To break the water bond we need energy. This energy is supported by a battery. Terminals connected to the battery act as a bridge for ion transportation. we have to add baking soda for this activity.

Required apparatus:-

Plastic container, battery, thumbtacks, baking powder and water .

Steps:-

• Take a battery and 2 thumbtacks, join the terminals to the thumbtacks.
• place the thumbtacks forwarded up means the points are in upward direction.
• place the plastic container on the thumbtacks.
• make sure that there is space between thumbtacks.
• Now, pour water and you have to add little amount of baking soda because activity can't happen in distilled water. you can HCl also.
• And switch on the current

Observation:-

you will notice bubbles near thumbtacks. It is nothing but Hydrogen and oxygen gas which are decomposed by electricity. You can collect the gases using test tubes. You have to add water to test tubes and place over thumbtacks downward before switch on the current (if you want to collect the gases for further use).

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