Chemical equations questions | form three Chemistry

Write a word equation for each of the following reactions:
(i) Calcium burns in oxygen
(ii) Sodium reacts with water

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UNSOLVED

(a) Write the chemical symbols for beryllium, boron, neon, nitrogen and phosphorus.
(b) Why some of the elements in (a) are assigned symbols with only one letter while others bear symbols with two letters?

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UNSOLVED

(a) Give three advantages of using chemical equations over word equations.
(b) You are provided with a compound of 22.2% zinc, 11.6% sulphur, 22.3% oxygen, and the rest percentage is water of crystallization. Calculate the molecular formula of the compound if its molecular mass is 283.

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UNSOLVED

With the aid of a chemical equation, describe how you would prepare pure solid sodium chloride by the action of an acid and a base.

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UNSOLVED