Question

Write chemical formula of 1) calcium hydroxide (2) aluminium oxide (3) potassium chloride (4) carbon tetrachloride (5) sodium carbonate (6) sodium nitrate

Answer 1

Answer:

Calcium hydroxide - Ca(OH)2

Aluminium oxide -Al2O3

Potassium Chloride - KCl

Carbon tetrachloride -C3Cl4

Sodium Carbonate - Na2Co3

Sodium Nitrate -NaNo3

Answer 2

1. Calcium hydroxide - Ca(OH)₂
2. Aluminum Oxide - Al₂O₃
3. Potassium Chloride - KCL
4. Carbon tetrachloride- CCl₄
5. Sodium Carbonate - Na₂CO₃
6. Sodium Nitrate - NaNO₃

• To write the chemical formula for ionic compounds, crisscross method is used.
• The numerical value of valence electrons of ions becomes the subs script of another ion.
• calcium hydroxide has valency +2 and the Valency of OH- ion is 1. Crisscrossing the valence electron. the subscript of Ca will be 1 and OH will be 2
• The chemical formula is Ca(oH)₂
• Valency of Aluminium ion +3, Valency of oxygen ion is -2. Applying the crisscross method, the chemical formula of Aluminum oxide is Al₂O₃
• The valency of potassium ion is +1 and chloride ion is -1. Crisscrossing the valance electrons, the chemical formula of Potassium chloride is KCl
• The valency of Carbon ion is +4 and chloride is -1. Applying the crisscross method. the chemical formula for Carbon tetrachloride is CCl₄
• The valency of the sodium ion is -1 and the carbonate ion is -2. Applying the crisscross method. The chemical formula is Na₂CO₃
• The valency of sodium ion is +1 and nitrate ion is also -1. Applying the crisscross method. the chemical formula is NaNO₃.

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