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Home Question Bank Chemistry Archive 2025 January 09

Chemistry Questions from Jan 09,2025

Browse the Chemistry Q&A Archive for Jan 09,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Which lists mixtures, in order, from the smallest particles to the largest particles? solution, colloid, suspension solution, suspension, colloid suspension, colloid, solution suspension, solution, colloid Thirty grams of lead oxide and fifteen grams of ammonia react completely to produce solid lead, nitrogen gas, and liquid water. What will be approximate mass of all three products? 10 g 15 g 45 g 450 g Which substance is a base? HCOOH RbOH \( \mathrm{H}_{2} \mathrm{CO}_{3} \) \( \mathrm{NaNO}_{3} \) Which best describes a chemical reaction? the rearrangement of atoms by breaking and reforming chemical bonds a reaction that absorbs heat from the surroundings a reaction that releases heat to the surroundings the rearrangement of molecules based on temperature and pressure What else is produced during the replacement reaction of silver nitrate and potassium suffate? \( 2 \mathrm{AgNO}_{3}+\mathrm{K}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{Ag}_{2} \mathrm{SO}_{4}+ \) \( \mathrm{KNO}_{3} \) \( 2 \mathrm{KNO}_{3} \) \( \mathrm{~K}_{2} \) \( 2 \mathrm{AgNO}_{3} \) 24. Se recogen sobre agua \( 100 \mathrm{~cm}^{3} \) de oxigeno medidos a \( 23^{\circ} \mathrm{C} \) y 800 mm Hg . Calcular el volumen de \( \mathrm{O}_{2} \) seco en CNPT considerando que la presión de vapor del agua a \( 23^{\circ} \mathrm{C} \) es \( 21,1 \mathrm{~mm} \mathrm{Hg} \). Rta: \( 94,5 \mathrm{~cm}^{3} \) Which of these is a light element? (1 point) iron lithium oxygen carbon Which is the heaviest element produced in large stars by nuclear fusion near the end of their life cycle? (1 point) helium beryllium uranium iron El Número de Avogadro, que tiene un valor aproximado de \( 602,200,000,000,000,000,000,000 \), se refiere al valo calculado del número de moléculas en un gramo mole de cualquier sustancia química. Escribir el Número de Avo- gadro en notación científica. What is the molar mass of \( \mathrm{KMnO}_{4} \) ? You must use the molar masses given below. \( \mathrm{K}=39.1 \mathrm{~g} \) \( \mathrm{Mn}=55 \mathrm{~g} \) \( \mathrm{O}=16 \mathrm{~g} \) \( 34,408 \mathrm{~g} \) 110.1 g 159 g 158.1 g
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