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Home Question Bank Chemistry Archive 2024 November 26

Chemistry Questions from Nov 26,2024

Browse the Chemistry Q&A Archive for Nov 26,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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1. What is the oxidation \( n \) dichromate? \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr} \) a. +3 b. +4 What are the oxidation n a. \( \mathrm{Ni}+3 ; \mathrm{S}+6 ; \mathrm{O}-2 \) b. \( \mathrm{Ni}+2 ; \mathrm{S}+4 ; \mathrm{O}-2 \) Um aquecedor de água recém-projetado mantém a água a \( 60,0^{\circ} \mathrm{C} \) para evitar o crescimento de microrganismos. No entanto, essa temperatura da água pode escaldar uma pessoa, então o aquecedor de água é usado com torneiras especialmente projetadas que misturam água quente e fria. A torneira mistura \( 1,00 \mathrm{~kg} \) de água quente com um mínimo de \( 0,0400 \mathrm{~kg} \) de água a \( 8,00^{\circ} \mathrm{C} \). Calcule a temperatura máxima da água na torneira. Arredonde sua resposta para o décimo mais próximo. \( { }^{\circ} \mathrm{C} \) 1. Realice un mapa conceptual de la clasificación química de las grasas e indique su función biológica. Use su libro de texto ( 4 puntos). In another set-up, a student has prepared a 3.64 g sample of CuCNS. How many molecules of CuCNS exist in this sample? (Avogadro's constant \( =6.022 \times 10^{23} \mathrm{~mol}^{-1} \) ) [2-580] On adding excess dilute hydrochloric acid to calcium carbonate, 2464 ml of \( \mathrm{CO}_{2} \) gas evolved (at STP). What is the volume of \( 0.5 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4} \) which is needed to react completely with that salt? [ \( \left.\mathrm{CaCO}_{3}=100 \mathrm{~g} / \mathrm{mol}\right] \) a) 22 mL b) 0.22 mL c) 220 mL d) 120 mL \( [2-430] \) Calculate the volume of water that should be added to 100 ml of a 0.3 molar sodium hydroxide \( \begin{array}{l}\text { (NaOH) solution to convert it to a solution with concentration } 0.1 \text { molar. } \\ \text { b) } 400 \mathrm{ml} \\ \text { c) } 600 \mathrm{ml} \\ \text { d) } 500 \mathrm{ml}\end{array} \) 1. Se está estudiando la respiración celular en una muestra de tejido. La muestra contiene una mezcla de gases donde el oxígeno en el compartimento A está a una presión de 1.2 atm y temperatura de 298 K , mientras que el dióxido de carbono en el compartimento B está a 0.8 atm y la misma temperatura. Am- bos compartimentos están separados por una membrana semipermeable. Calcula el potencial químico del oxígeno y dióxido de carbono en cada compartimento y determina la dirección del flujo de gases a través de la membrana. La etiqueta de un botella de amoniaco concentrado indica que contiene 26.2 \% en masa de amoniaco \( \mathrm{NH}_{3} \) y que su densidad es \( 0.898 \mathrm{~g} / \mathrm{mL} \). Cual es la molaridad del amoniaco concentrado? Tome los siguientes pesos \( \mathrm{H}=1.0 \mathrm{~g} / \mathrm{mol} \) \( \mathrm{N}=14.0 \mathrm{~g} / \mathrm{mol} \). Dé su respuesta con trés decimales y use punto en vez de coma. [2-331] You can differentiate between the main reagents of the third analytical group \& the fifth analytical group by using .................... a) \( \mathrm{CaCl}_{2} \) solution b) \( \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3} \) solution c) dil. HCl d) more than one is correct [2-481] ............. can't be used as standard solution to determine the concentration of calcium hydroxide accurately. a) Hydrochloric acid b) Sulphuric acid c) Nitric acid d) Nitrous acid
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