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Subjects

Chemistry

Laws of chemical combination

In this Class 11 Chemistry topic from “Some Basic Concepts of Chemistry,” students learn the fundamental laws that describe how elements combine to form compounds. They explore the law of conservation of mass, definite proportions, multiple proportions, and related ideas about combining volumes and particles. The topic helps students interpret chemical formulas, compare compound compositions, understand the basis of atomic theory, and apply these principles while balancing equations and solving introductory chemical calculations.

Easy · Level 11 · 25 questions

Practice questions

01Before applying which law is it necessary to check that the sample is a pure compound?

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02Before applying which law should several compounds of the same two elements be identified?

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03Before applying which law should the same temperature and pressure of gases be checked?

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04For which law is a closed system the best experimental method?

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05In which law are mass relations among three elements studied?

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06A pure compound contains 18 percent A and 82 percent B. What is the simple mass ratio A:B?

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07A pure compound contains 42 percent A and 58 percent B. What is the simple mass ratio A:B?

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08A pure compound contains 64 percent A and 36 percent B. What is the simple mass ratio A:B?

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09A pure compound contains 28 percent A and 72 percent B. What is the simple mass ratio A:B?

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10A pure compound contains 55 percent A and 45 percent B. What is the simple mass ratio A:B?

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11A pure compound contains 12 percent A and 88 percent B. What is the simple mass ratio A:B?

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12A pure compound contains 48 percent A and 52 percent B. What is the simple mass ratio A:B?

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13A pure compound contains 70 percent A and 30 percent B. What is the simple mass ratio A:B?

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14In a closed vessel total reactants are 80 grams. If one product is 47 grams what is the other product?

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15In a closed vessel total reactants are 72 grams. If one product is 33 grams what is the other product?

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16In a closed vessel total reactants are 95 grams. If one product is 58 grams what is the other product?

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17In a closed vessel total reactants are 68 grams. If one product is 41 grams what is the other product?

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18Which law shows that simple whole number mass ratios support atoms combining in whole numbers?

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19In a closed vessel total reactants are 88 grams. If one product is 63 grams what is the other product?

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20In two compounds, a fixed mass of 15 g of A combines with 12 g and 48 g of B, respectively. What is the simplest ratio of the masses of B?

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21In two compounds, a fixed mass of 20 g of A combines with 16 g and 40 g of B, respectively. What is the simplest ratio of the masses of B?

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22In two compounds, a fixed mass of 18 g of A combines with 21 g and 63 g of B, respectively. What is the simplest ratio of the masses of B?

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23In two compounds, a fixed mass of 25 g of A combines with 30 g and 45 g of B, respectively. What is the simplest ratio of the masses of B?

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24In two compounds, a fixed mass of 14 g of A combines with 22 g and 44 g of B, respectively. What is the simplest ratio of the masses of B?

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25In two compounds, a fixed mass of 16 g of A combines with 27 g and 81 g of B, respectively. What is the simplest ratio of the masses of B?

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