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Home Question Bank Chemistry Archive 2024 December 21

Chemistry Questions from Dec 21,2024

Browse the Chemistry Q&A Archive for Dec 21,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Question B 2 The following redox reaction is used in acidic solution in the Breathalyzer test to determine the level of alcohol in th blood of drunk drivers: \[ \mathrm{H}^{+}(\mathrm{aq})+\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}(\mathrm{aq})+\mathrm{C}_{2} \mathrm{H}_{5} \rightarrow \mathrm{Cr}^{3+}(\mathrm{aq})+\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O} \] a) Identify the elements undergoing changes in oxidation state and indicate the initial and final oxidation numbers for theseelements. Question B2 The following redox reaction is used in acidic solution in the Breathalyzer test to determine the level of alcohol in tl] blood of drunk drivers: \[ \mathrm{H}^{+}(\mathrm{aq})+\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}(\mathrm{aq})+\mathrm{C}_{2} \mathrm{H}_{5} \rightarrow \mathrm{Cr}^{3+}(\mathrm{aq})+\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O} \] a) Identify the elements undergoing changes in oxidation state and indicate the initial and final oxidation numbers for these elements. [5] b) Write and balance the oxidation half-reaction.[6] c) Write and balance the reduction half reaction.[6] d) Combine the half-reactions to produce a balanced redox reaction. [3] Select the single best answer. Which of the following describes the bonding in the hydrogen cyanide molecule, HCN? As N is \( s p \)-hybridized. C uses \( s p \) hybridized orbitals in bonding. C uses \( s p^{2} \) hybridized orbitals in bonding. C uses \( s p^{3} \) hybridized orbitals in bonding. C uses \( s p^{3} d \) hybridized orbitals in bonding. (a) \( \mathrm{SiBr}_{4} \) tristorted tetrahedron (b) \( \mathrm{CS}_{2} \) trigonal pyramidal trigonal planar trigonal pyramidal (c) \( \mathrm{NO}_{3}^{-} \) trigonal planar bent trigonal pyramidal tetrahedral to Select the single best answer. Select the statement that correctly describes the hybridization of phosphorus in \( \mathrm{PF}_{5} \). Phosphorus is \( s p^{2} \) hybridized. Phosphorus is \( s p^{3} \) hybridized. Phosphorus is \( s p^{3} d \) hybridized. Phosphorus is \( s p^{3} d^{2} \) hybridized. When 200 g of nugar is dissolved in 60.0 g of water, the percent by mass of sugar in the solution is What is the Structural Formular for water? c) Calculer le volume de 0.3 mol de cO2 On donne \( M_{\mathrm{v}}=14 \mathrm{~g} / \mathrm{mol}: M \mathrm{MH}=1 \mathrm{~g} / \mathrm{mol} \) : \( =35.5 \mathrm{~g} / \mathrm{mol}: V \mathrm{~m}=24 \mathrm{l} / \mathrm{mol} \) Exercice 2 : On donne l'équation bilan non équilibrée 16) ต้องละลายโซเดียมคลอไรดีกี่กรัม ลงในน้ำ 200 มิลลิลิตร เพื่อให้ได้สารละลายที่มีความเข้มข้น 10 โมลแลล 15) สารละลายแบริเรียมโบรไมด์มีความเข้มข้นร้อยละ 40 โดยมวล มีความหนาแน่น เท่ากับ 2 กรัมต่อมิลลิลิตร จงหาความเข้มข้นในหน่วยร้อยละโดยมวลต่อปริมาตร
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