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Home Question Bank Chemistry Archive 2024 November 14

Chemistry Questions from Nov 14,2024

Browse the Chemistry Q&A Archive for Nov 14,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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h) Si en una neutralización hace reaccionar 35 mL de \( \mathrm{HClO}_{4} \) con \( 28,3 \mathrm{~mL} \) de \( \mathrm{KOH} 0,20 \mathrm{M} \), ¿Cuál es la concentración del \( \mathrm{HClO}_{4} \) Puntaje: 0,3 fórmula, 0,3 reemplazo, 0,4 resultado si no coloca la unidad ( \( -0,2 \) ) (1,0 puntos) 15) From the amphoteric hydroxides that can dissolve in strong acids alkali a) Iron Il hydroxide b) aluminum hydroxide c) Iron Ili hydroxide d) all of the previous 2.2 A 9.780 g gaseous mixture contains ethane \( \left(\mathrm{C}_{2} \mathrm{H}_{6}\right) \) and propane \( \left(\mathrm{C}_{3} \mathrm{H}_{8}\right) \). Complete combustion of the mixture requires 1.120 moles of oxygen gas to form carbon dioxide and water. 2.2 .1 Write balanced equations for the two reactions. 2.20 (2) Calculate the mass of ethane in the mixture. Question \( 5 \quad \) [26 marks] \( \begin{array}{l}\text { Substance } A \text { has a molecular formula of } \mathrm{C}_{5} \mathrm{H}_{10} \mathrm{O}_{2} \text {. Substance } \mathrm{A} \text { has the smell of apples. It is a } \\ \text { product of the reaction between butanoic acid and an alcohol } B \text {. } \\ \text { Answer the following questions based on the above statement: } \\ \text { 5.1.1 What family of organic compounds does substance } A \text { belong to? } \\ \text { 5.1.2 Draw the expanded structure of compound } A \text {. }\end{array} \) (1) The water dissolves some of the chemicals in the tea leaves when you are using a tea bag to make tea. 4.4 Boric acid, \( \mathrm{B}(\mathrm{OH})_{3} \), a weak acid is used as a mild antiseptic. It ionizes in water as follows: \[ \mathrm{B}(\mathrm{OH})_{3}(\mathrm{aq})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightleftharpoons \mathrm{B}(\mathrm{OH})_{4}^{-}(\mathrm{aq})+\mathrm{H}_{3} \mathrm{O}^{+}(\mathrm{aq}) \] 4.4.1 Calculate the hydronium ion concentration of a 0.015 M aqueous solution of boric acid, given that the equilibrium constant for this reaction is \( 5.9 \times 10^{-10} \). Question \( 4 \quad[20 \) marks \( ] \) \( 4.1 \quad \) Write an equation in which \( \mathrm{H}_{2} \mathrm{PO}_{3}^{-} \)acts as an acid and another in which it acts as a base. (2) 4.2 A shampoo solution at \( 25^{\circ} \mathrm{C} \) has a hydroxide ion concentration of \( 1.5 \times 10^{-9} \mathrm{M} \). 4.2 .1 Calculate its hydronium ion concentration. 4.2 .2 Is this solution acidic, neutral, or basic? Give a reason for your answer. 4.3 A 1.00 L aqueous solution contained 5.80 g of sodium hydroxide, \( \mathrm{NaOH} . \mathrm{Calculate} \) the pH of this solution at \( 25^{\circ} \mathrm{C} \) ? Alcoholes \( \begin{array}{l}\text { a) 2-propanol } \\ \text { b) 2-metil-2-butanol } \\ \text { c) 3-hexanol }\end{array} \) 3.2 Propane, \( \mathrm{C}_{3} \mathrm{H}_{8} \), is a common fuel gas. Use the following information to calculate the mass of propane you would need in order to provide 369 kJ of heat. \[ \mathrm{C}_{3} \mathrm{H}_{8}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 3 \mathrm{CO}_{2}(\mathrm{~g})+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \quad \Delta \mathrm{H}=-2043 \mathrm{~kJ} \] 10. Señala cuáles de los siguientes procesos son cambios físicos y cuáles cambios químicos a) Vaporización del agua. b) Mezcla en un recipiente de dos gases, o hidrógeno.
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