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Question
Explain the following type of chemical reaction, giving two examples for it:
Decomposition reaction
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Solution
A reaction in which a compound breaks up due to heat application into two or more simple substances is called a decomposition reaction.
\[\ce{AB->[heat] A + B}\]
Examples:
- Mercuric oxide when heated, decomposes to form two elements mercury and oxygen
\[\ce{2HgO_{(s)}->[heat] 2Hg_{(s)} + O2_{(g)}}\] - CaCO3 when heated decomposes to calcium oxide and carbon dioxide.
\[\ce{CaCO3 ->[heat] CaO + CO2}\]
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RELATED QUESTIONS
Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity
A solid substance P which is very hard is used in the construction of many buildings, especially flooring. When substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water with the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitate of substance T is formed. The substance T has the same chemical composition as starting substance P.
- What is substance P? Write its common name as well as chemical formula.
- What is substance Q?
- What is gas R?
- What is substance S? What is its clear solution known as?
- What is substance T? Name any two natural forms in which substance T occurs in nature.
Give one example of a decomposition reaction which is carried out by applying heat.
What type of reaction is represented by the following equation?
\[\ce{2FeSO4 -> Fe2O3 + SO2 + SO3}\]
What type of chemical reaction takes place when limestone is heated?
What is a redox reaction? Explain with an example.
Classify the following reaction into different type:
\[\ce{2KClO3(s)->[\Delta] 2KCl(aq) + 3O2(g)}\]
What is electrolysis?
Photolysis is a decomposition reaction caused by ______
- Identify the gasses evolved at the anode and cathode in the above experimental set up.
- Name the process that occurs. Why is it called so?
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