Question

Answer the following questions: (1) write the equation for each decomposition reaction in which energy is provided in the form of heat, light an brad electricity. (2) what is the difference between displacement reaction and double displacement reaction? Write the chemical equations for these reactions

Answer 1

1. (see the attachment)
2. (see the attachment)

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Answer 2

Explanation:

✳️$\mathfrak{Question:}$

(1) write the equation for each decomposition reaction in which energy is provided in the form of heat, light an brad electricity.

Heat:

Some compounds break down when heated, forming two or more products from one reactant. This type of reaction is called thermal decomposition.

Many metal carbonates can take part in thermal decomposition reactions. For example, copper carbonate breaks down easily when it is heated:

copper carbonate → copper oxide + carbon dioxide

CuCO3 → CuO + CO2

Light:

Decomposition of silver chloride:Place a small quantity of silver chloride (AgCl) taken in a watch glass under sunlight for some time. The crystals slowly acquire a grey colour. On analysis, it is found that the sunlight has caused decomposition of silver chloride into silver and chlorine.

2AgCl -> 2Ag + Cl2

Electricity:

Electrolytic decomposition reaction (Electrolysis)

Electrolytic decomposition may result when electric current is passed through an aqueous solution of a compound. A good example is the electrolysis of water.

2NaCl -> 2Na + 2Cl

✳️$\mathfrak{Question:}$

(2) what is the difference between displacement reaction and double displacement reaction? Write the chemical equations for these reactions

When an element displaces another element from its compound, a displacement reaction occurs.

Example : Fe + CuSO4 = FeSO4 + Cu

Two different atoms or groups of atoms (ions) are exchanged in a double displacement reaction.

Example : Na2SO4 + BaCl2 = BaSO4 + NaCl

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