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Home Question Bank Chemistry Archive 2024 November 10

Chemistry Questions from Nov 10,2024

Browse the Chemistry Q&A Archive for Nov 10,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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A partir de tus conocimientos previos completa de forma individual y de forma breve la información que se solicita Concepto de Materia, Mol, Reacción química, Ecuación química, Reactivos, Productos, Reactivo limitante, Leyes ponderales, Número de Avogadro y Estequiometría. Which of the following is exothermic? Select all that apply A) \( 4 \mathrm{NH}_{3}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 4 \mathrm{NO}(\mathrm{g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \Delta H^{\circ}=1168 \mathrm{~kJ} \) B) \( 2 \mathrm{LiOH}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \rightarrow \mathrm{Li}_{2} \mathrm{SO}_{4}(\mathrm{aq})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \) C) \( 2 \mathrm{KCl}(\mathrm{aq})+\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq}) \rightarrow \mathrm{PbCl}_{2}(\mathrm{~s})+2 \mathrm{KNO}_{3}(\mathrm{aq}) \) D) \( \mathrm{Zn}(\mathrm{s})+2 \mathrm{AgNO}_{3}(\mathrm{aq}) \rightarrow \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{s}) \) E) \( 2 \mathrm{Cu}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{CuO}(\mathrm{s}) \) Which of the following is exothermic? Select all that apply A) \( \mathrm{SiO}_{2}(\mathrm{~s})+4 \mathrm{HF}(\mathrm{g}) \rightarrow \mathrm{SiF}_{4}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \Delta \mathrm{H}^{\circ}{ }_{\mathrm{rxn}}=-184 \mathrm{~kJ} \) B) \( \mathrm{H}_{2} \mathrm{O}(\mathrm{s}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \) C) \( 4 \mathrm{Na}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{Na} 2 \mathrm{O}(\mathrm{s}) \) D) \( 2 \mathrm{SO}_{3}(\mathrm{~g})+791.4 \mathrm{~kJ} \rightarrow 2 \mathrm{~S}(\mathrm{~s})+3 \mathrm{O}_{2}(\mathrm{~g}) \) E) \( \mathrm{C}_{3} \mathrm{H}_{8}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 3 \mathrm{CO}_{2}(\mathrm{~g})+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \) Which of the following is endothermic? Select all that apply A) \( \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{H}_{2} \mathrm{O} \) (l) B) \( \mathrm{C}_{3} \mathrm{H}_{8}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 3 \mathrm{CO}_{2}(\mathrm{~g})+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \) C) \( 4 \mathrm{NH}_{3}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 4 \mathrm{NO}(\mathrm{g})+6 \mathrm{H}_{2} \mathrm{O}(l) \Delta H^{\circ}=1168 \mathrm{~kJ} \) D) \( \mathrm{NaCl}_{(\mathrm{g})+181.42 \mathrm{~kJ} \rightarrow 1 / 2 \mathrm{Cl}_{2}(\mathrm{~g})+\mathrm{Na}(\mathrm{g})}^{\text {E) } 6 \mathrm{Li}(\mathrm{s})+\mathrm{N}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{Li}_{3} \mathrm{~N}(\mathrm{~s})} \) Which of the following is endothermic? Select all that apply \( \begin{array}{l}\text { A) } \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{H}_{2} \mathrm{O} \text { (s) } \\ \text { B) } \mathrm{H}_{2} \mathrm{O}(\mathrm{s}) \rightarrow \mathrm{H}_{2} \mathrm{O} \text { (l) } \\ \text { C) } \mathrm{CH}_{4}(\mathrm{~g})+2 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O} \text { (g) } \\ \text { D) } \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{H}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \\ \text { E) } \mathrm{Ag}(\mathrm{s})+1 / 2 \mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow \mathrm{AgCl} \text { (s) }\end{array} \) We can say that this reaction is (endothermic or exothermic) and that the sign of \( \Delta \mathrm{H} \) is (positive or negative). The energy of products is (more or less) than energy of reactants. \( 2 \mathrm{C}_{6} \mathrm{H}_{6}(\mathrm{l})+15 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 12 \mathrm{CO}_{2}(\mathrm{~g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})+6278 \mathrm{~kJ} \) We can say that this reaction is (endothermic or exothermic) and that the sign of \( \Delta \mathrm{H} \) is (positive or negative). The energy of products is (more or less) than energy of reactants. \[ \] Calculate the solubility of \( \mathrm{Co}(\mathrm{OH})_{2} \) in water at \( 25^{\circ} \mathrm{C} \). You'll find \( K_{s p} \) data in the ALEKS Data tab. Round your answer to 2 significant digits. What is the electron configuration for helium \( (\mathrm{He}) \) ? \( 1 \mathrm{~s}^{1} \) \( 1 \mathrm{~s}^{2} \) \( 1 \mathrm{~s}^{2} 2 \mathrm{~s}^{1} \) \( 1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} \) A chemist titrates \( 250,0 \mathrm{~mL} \) of a 0.2736 M dimethylamine \( \left(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}\right) \) solution with 0.7491 MHCl solution at \( 25{ }^{\circ} \mathrm{C} \). Calculate the pH at equivalence. The \( p \mathrm{~K}_{\mathrm{b}} \) of dimethylamine is 3.27 . Round your answer to 2 decimal places. Note for advanced students; you may assume the total volume of the solution equals the initial volume plus the volume of HCl solution added. \( \mathrm{PH}=\square \)
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