Atomic Foundations of Matter
CBSE · Class 9 · Science
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A sample of 9 g of purified water is decomposed. How much hydrogen and oxygen are obtained together, and what is the mass ratio of hydrogen to oxygen?
A reaction produces 2.4 g of carbon and enough oxygen to form carbon dioxide. Using the given mass relation, how much carbon dioxide is formed?
In the formation of sodium chloride, 46 g sodium reacts completely. How much chlorine is needed?
A closed container has 4.0 g calcium carbonate and 2.92 g hydrochloric acid. After reaction, 1.76 g carbon dioxide, 0.72 g water and 4.44 g calcium chloride are formed. What is the total mass of products?
Sample Questions
In a closed reaction, 4.0 g calcium carbonate reacts with 2.92 g hydrochloric acid. What is the total mass of reactants?
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6.92 g
Add the reactant masses: 4.0 g + 2.92 g = 6.92 g.
A reaction gives 1.76 g carbon dioxide, 0.72 g water and 4.44 g calcium chloride. What is the difference between total product mass and total reactant mass if the reactants weighed 6.92 g?
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0 g
Total products = 1.76 + 0.72 + 4.44 = 6.92 g. Total reactants = 6.92 g. The difference is 0 g.
Water is decomposed into hydrogen and oxygen. If 18 g water is decomposed, how much oxygen is obtained?
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16 g
From 9 g water, 1 g hydrogen and 8 g oxygen are obtained. Doubling to 18 g water gives 2 g hydrogen and 16 g oxygen.
If 24 g carbon reacts completely with oxygen, how much carbon dioxide is formed?
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88 g
From 12 g carbon, 44 g carbon dioxide is formed. 24 g carbon is double 12 g, so carbon dioxide is double 44 g, which is 88 g.
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- National Education Policy 2020 — education.gov.in
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