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Home Question Bank Chemistry Archive 2025 January 22

Chemistry Questions from Jan 22,2025

Browse the Chemistry Q&A Archive for Jan 22,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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\begin{tabular}{|c|}\hline Which of these terms \\ describes KOH? \\ \hline strong acid \\ weak acid \\ \hline strong base \\ \hline\end{tabular} 16. Student 2 says that a butane molecule may settle into a moderately high- * energy conformation. Which of the following findings, if true, could be used to counter this argument? 14. Suppose butane molecules are cooled so that each molecule is allowed t reach its active shape. Which of the following statements is most consistent with the information presented in the passage? 4. (4) For the following reaction: a. Balance the molecular equation b. Write the half reaction for the substance that was oxidized Practice: Mixed Formulas Directions: Label the following compounds as ionic (I), covalent (C), acid (A) or hydrate (H). Then write the formulas for each compound. 1. sodium carbonate decahydrate _- 2. dinitrogen tetroxide 3. silver (I) acetate 4. cesium sulfide 5. dinitrogen tetroxide 6. hydroiodic acid 7. ammonium chromate 8. zinc (II) hydroxide 9. sulfuric acid 0. cobalt (II) chloride tetrahydrate 1. silicon hexachloride 2. manganese (II) nitrate 3. zinc (II) hydroxide 1. hydrobromic acid in diphosphorus pentoxide Practice: Mixed lonic and Covalent Formulas Directions: First, identify the following compounds as ionic (I) or covalent (C). Then name each compound. 1. dinitrogen monoxide 2. ammonium phosphate 3. iron (II) oxide 4. iron (III) oxide 5. dinitrogen trioxide 6. carbon monoxide 7. calcium chloride 8. potassium nitrate 9. sulfur trioxide 10. silicon dioxide 11. magnesium hydroxide 12. aluminum sulfate 13. copper (II) sulfate 14. diphosphorus pentoxide 15. sodium hydrogen carbonate Practice: Hydrates Directions: Write formulas for each of the following compounds. 1. Nickel (II) sulfite hexahydrate 2. Magnesium sulfite hexahydrate 3. Calcium sulfite dihydrate 4. Sodium bisulfate monohydrate 5. Sodium acetate trihydrate 6. Zinc sulfate monohydrate 7. Copper (II) nitrate trihydrate 8. Manganese (II) sulfate monohydrate 9. Copper (II) sulfate pentahydrate 1. El número de masa corresponde a: I a. la suma de protones más neutrones. b. el número de electrones. c. c. la suma de electrones más protones. d. el número de protones. oblema 8. Se coloca cierta cantidad de trioxido de azufre, \( \mathrm{SO}_{2} \), en un matraz de \( 0,80 \mathrm{~L} \). A cier mperatura, se establece el equilibrio de disociación siguiente: \[ 2 \mathrm{SO}_{3}(\mathrm{~g}) \leftrightarrows 2 \mathrm{SO}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) \] comprueba que en el equilibrio había 2 moles de \( \mathrm{O}_{2} \). Si la constante Kc vale 0,22 , a peratura de la experiencia, calcula las concentraciones de las tres especies quimicas en ilibrio y el grado de disociación del \( \mathrm{SO}_{3} \) Zinc melts at \( 420^{\circ} \mathrm{C} \) and its standard entropy at \( 25^{\circ} \mathrm{C} \) is \( 9.95 \mathrm{cal} / \mathrm{mol} / \mathrm{K} \). The standard entropy of zinc at \( 750^{\circ} \mathrm{C} \) is __ \( \mathrm{Cal} / \mathrm{mol} / \mathrm{K} \), round off to one decimal place). Given: Heat of fusion of \( \mathrm{Zn}\left(\Delta \mathrm{H}_{1}\right)=1.74 \mathrm{kcal} / \mathrm{mol} \) \( C_{p}< \) solid \( \mathrm{Zn}>=5.35+2.40 \times 10^{-3} \mathrm{~T} \mathrm{cal} / \mathrm{mol} / \mathrm{K} \) \( C_{p} \) (liquid Zn\( )=7.50 \mathrm{cal} / \mathrm{mol} / \mathrm{K} \)
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