10 Questions
What is the product of the thermal decomposition of lead nitrate?
Lead oxide, nitrogen dioxide, and oxygen
What is the color of the fumes emitted during the heating of lead nitrate?
Brown
What is the purpose of adding dilute sulphuric acid to the water in Activity 1.7?
To facilitate the electrolysis of water
What is the voltage of the battery used in Activity 1.7?
6 volts
What is the purpose of inverting the test tubes over the carbon electrodes in Activity 1.7?
To collect the gases produced
What is the result of bringing a burning candle close to the mouth of the test tube containing oxygen?
The candle will burn more vigorously
What is the reaction that occurs when lead nitrate is heated?
Thermal decomposition reaction
What is the purpose of using carbon electrodes in Activity 1.7?
To facilitate the electrolysis of water
What is the gas produced at the anode during the electrolysis of water in Activity 1.7?
Oxygen
What is the result of the thermal decomposition of lead nitrate?
Formation of lead oxide and nitrogen dioxide
Study Notes
Decomposition Reaction
- A decomposition reaction is a type of reaction where a single reactant breaks down to give simpler products.
- Example: Heat decomposes ferrous sulphate (FeSO4) to ferric oxide (Fe2O3), sulphur dioxide (SO2), and sulphur trioxide (SO3).
Thermal Decomposition
- Thermal decomposition is a decomposition reaction that occurs when a substance is heated.
- Example: Heat decomposes calcium carbonate (CaCO3) to calcium oxide (CaO) and carbon dioxide (CO2).
Examples of Decomposition Reactions
- Ferrous sulphate (FeSO4) decomposes to ferric oxide (Fe2O3), sulphur dioxide (SO2), and sulphur trioxide (SO3) when heated.
- Calcium carbonate (CaCO3) decomposes to calcium oxide (CaO) and carbon dioxide (CO2) when heated.
- Lead nitrate (Pb(NO3)2) decomposes to lead oxide (PbO), nitrogen dioxide (NO2), and oxygen (O2) when heated.
- Vegetable matter decomposes to compost, an example of an exothermic reaction.
Importance of Decomposition Reactions
- Decomposition reactions are used in various industries, such as the manufacture of cement.
- Decomposition reactions occur in nature, such as the breakdown of carbohydrates in the body to provide energy through respiration.
Electrolysis of Water
- Electrolysis of water is a decomposition reaction that occurs when an electric current is passed through water.
- Water decomposes into hydrogen and oxygen gases when an electric current is passed through it.
Identify the type of reaction that occurs when ferrous sulphate breaks down into simpler products, including ferric oxide, sulphur dioxide, and sulphur trioxide.
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