Chapter 3: Atoms and Molecules

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Atoms and Molecules

Question:

Q.4: Write the chemical formulae of the following:

(a) Magnesium chloride

(b) Calcium oxide

(c) Copper nitrate

(d) Aluminium chloride

(e) Calcium carbonate.

Answer:

(a) Magnesium chloride contains magnesium cation and chloride anion. Magnesium is divalent while chlorine is a univalent ion. The formation of magnesium chloride is shown below:

 

(b) Calcium oxide contains calcium cation and oxide anion. Both calcium and oxide are divalent ions. The formation of calcium oxide is shown below:

 

 

(c) Copper nitrate contains copper cation and nitrate anion. Copper is divalent while nitrate is a univalent ion. The formation of copper nitrate is shown below:

 

 

(d) Aluminium chloride contains aluminium cation and chloride anion. Aluminium is trivalent while chlorine is a univalent ion. The formation of aluminium chloride is shown below:

 

 

(e) Calcium carbonate contains calcium cation and carbonate anion. Both calcium and carbonate are divalent ions. The formation of calcium carbonate is shown below:

 

 


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