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Q1. What are the rules for writing chemical formula of a compound? Q2. Write the chemical formula of ammonium hydroxide,calcium oxide, Sodium chloride, Magnesium hydroxide, calcium carbonate using cross method. Q3. Calculate the molecular mass of glucose, carbon dioxide,ammonia. Q4. Calculate the formula unit mass of Sodium chloride, Magnesium oxide, Calcium oxide.
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1 . Rules of Writing Chemical Formula
- One must know the valencies of the two elements or radicals present.
- In a chemical formula, the sum of the total number of positive and negative valencies present in the compound should be zero. ...
- If present, you must always place the meta at the beginning of the formula.
2. Write the chemical formula of the following.
- (a) Magnesium chloride
- (b) Calcium oxide
- (c) Copper nitrate
- (d) Aluminium chloride
- (e) Calcium carbonate
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