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This document appears to be a collection of materials related to the study of hydrogen, water, and hydrogen peroxide in the context of a pharmaceutical chemistry course. It includes a title page from the Tashkent Pharmaceutical Institute, a crossword puzzle focusing on hydrogen, a set of problems related to hydrogen, water, and hydrogen peroxide, equations involving these substances, and a multiple-choice test on hydrogen.

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Crossword Puzzle: Hydrogen: A crossword puzzle designed to test knowledge of hydrogen-related terms and concepts. The clues cover various aspects of hydrogen chemistry, including types of salts, properties of hydrogen gas, and acid-base chemistry.
Problems: Hydrogen, Water, and Hydrogen Peroxide: A set of quantitative problems involving calculations related to the reactions and properties of hydrogen, water, and hydrogen peroxide. These problems require applying stoichiometry, gas laws, and solution chemistry principles.
Reaction Equations: Hydrogen, Water, and Hydrogen Peroxide: A list of incomplete chemical equations involving hydrogen, water, and hydrogen peroxide. Students are expected to complete and balance these equations, demonstrating their understanding of chemical reactions.
Test: Hydrogen: A multiple-choice test covering basic properties of hydrogen, its reactivity, and its role in chemical compounds. The test assesses understanding of concepts like density, reaction conditions, and stoichiometry.