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Home Question Bank Chemistry Archive 2025 January 02

Chemistry Questions from Jan 02,2025

Browse the Chemistry Q&A Archive for Jan 02,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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What are the names of the substances involved in a chemical reaction? A gases and solids B anodes and cathodes C reactants and products D solvents and solutes 1. Un hydrocarbure A de masse molaire \( 78 \mathrm{~g} / \mathrm{mol} \) renferme en masse \( 7,7 \% \) d'hydrogene. Etablir la formule brute de l'hydrocarbure A . 2. Le. composé A réagit avec le dihydrogène et donne du cyclohexane (hydrocarbure saturé de formule \( \mathrm{C}_{6} \mathrm{H}_{12} \) ). a. Ecrire l'équation de la réaction. Donner le nom de cettention. b. Quel volume minimal de \( \mathrm{H}_{2} \) mesuré dans les conditions normales Application 2 : Consider the following elements: \( { }_{4} \mathrm{Be} \) and \( { }_{15} \mathrm{P} \). 1) Write the e- configuration. 2) Precise the group, period and column for each element. 3) Indicate the valence e-s and write the Lewis dot symbol for each one. 4) Identify the valence of each and give the rule of stability. What is the formula for the hydroxide ion? A. \( \mathrm{HO}_{2}^{-} \) B. \( \mathrm{H}_{2} \mathrm{O}^{-} \) Question 20 of 22 A patient needs to be given exactly 500 mL of a \( 5.0 \%(\mathrm{w} / \mathrm{v}) \) intravenous glucose solution. The stock solution is \( 55 \% \) (w/v). How many milliliters of the stock solution are needed to prepare the fluid for the IV bag? Complete the equation for the dissociation of \( \mathrm{Na}_{2} \mathrm{CO}_{3}(\mathrm{aq}) \). Omit water from the equation because it is understood to be present. 10-26. \( 25,0 \mathrm{~mL} \quad 0,0200 \mathrm{M} 2 \)-aminofenol çözeltisi, \( 10,9 \mathrm{~mL} 0,0 \) \( \mathrm{M} \mathrm{HClO}_{4} \) ile titre edildiğinde elde edilen çözeltinin pH 'sını he layınız. Qulum chloride is called an electrovalent compound. inmonia is called a covalent compound. Radioaktives Chlor \( { }^{39} \mathrm{Cl} \) zerfällt so schnell, dass die vorhandene Menge sich jede Stunde halbiert. Zu Beginn der Messung werden 10 mg der Substanz nachgewiesen. Berechne, wie viel \( { }^{39} \mathrm{Cl} \) \( \begin{array}{ll}\text { (1) nach } 20 \text { Minuten noch vorhanden ist; } & \text { (2) } 30 \text { Minuten vorher vorhanden war. }\end{array} \) 3. Chemistry: What is the chemical formula for table salt?
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