Prepare an assignment on topic The language of chemistry
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Chapter 1: Language of Chemistry for class 9
1. Why is the symbol N for nitrogen, but K for potassium and Si for silicon?
2. The valency of an element X is 2 and that of element Y is 3.Write the formula of the compound formed
by the combination of X and Y.
3. The formula of the phosphate of an element B is B3(PO4)2. Write the formula of its
a. Bromide b..Nitrate c. Peroxide
4. Derive the chemical formula of :
a. Stannic oxide b. Calcium zincate c. Nickel phosphate d. Barium nitrate
5. Calculate the molecular mass of :
a. Sodium acetate b. Magnesium nitride
6. What is the valency of nitrogen in the following compounds:
a. NO b. NO2 c. N2O3 d.N2O5
7. Write the empirical formula of :
a. Glucose b. Acetic acid c. Ethane
8. Calculate the percentage composition of each element present in ammonium sulphate.
9. Calculate the percentage mass of water in washing soda crystals.
10. Calculate the percentage of carbon in calcium carbonate
Answer:
Marks as brainlist first