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Hogar Banco de preguntas Química Archive 2025 January 20

Chemistry Questions from Jan 20,2025

Browse the Chemistry Q&A Archive for Jan 20,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Осмотическое давление раствора глюкозы , содержащего 10 г растворённого вещества в 200 мл раствора, при температуре 654,5 кПа. Ответ округлите до десятых. 45.0 g of potassium iodide (KI) mol KI Answer the following. (a) A certain solution has a hydrogen ion concentration of moles per liter. Write this number in standard notation. (b) A hippopotamus can weigh up to 9900 pounds. Write this number in scientific notation. (a) moles per liter (b) pounds Be sure your answer has the correct number of significant figures. molecules atoms atoms atoms O Macmillan Learning Consider these reactions, where M represents a generic metal. 1. 2. 3. 4. Use the given information to determine the enthalpy of the reaction TOOLS Which statement correctly describes why a compound is a pure substance? A compound is not a pure substance because each of its molecules is made up of the atoms of two or more differer elements. A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means. A compound is not a pure substance because it is not an element, and only elements are pure substances. A compound is a pure substance because it consists of two different elements, which are pure substănces. Which statement correctly describes why a compound is a pure substance? A compound is not a pure substance because each of its molecules is made up of the atoms of two or more differ elements. A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means. A compound is not a pure substance because it is not an element, and only elements are pure substances. A compound is a pure substance because it consists of two different elements, which are pure substances.
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