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Home Question Bank Chemistry Archive 2024 December 29

Chemistry Questions from Dec 29,2024

Browse the Chemistry Q&A Archive for Dec 29,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Enunciado Pregunta: Un quimico mide la cantidad de una sustancia en un experimento y obtiene \( 0.50 \mathrm{~mol}, 0.49 \) mol y 0.51 mol en tres mediciones consecutivas. ¿Qué se puede concluir sobre las mediciones de la cantidad de la sustancia? a. Falta de exactitud. b. Problemas de calibración del instrumento. c. Gran dispersión en los valores. d. Precision en las mediciones. Whetivity 2.4 Why do elements form ions in certain chemical reactions? Which of the following pairs of elements are likely to form an ionic compound? a. sodium and chlorine b. nitrogen and fluorine c. lithium and oxygen What volume of alcohol with a density of \( 8.4 \times 10^{2} \) \( \mathrm{kgm}^{-3} \) will have the sane mass as \( 4.2 \mathrm{~m}^{3} \) of petrol clensity is \( 7.2 \times 10^{2} \mathrm{kgm}^{-3} \) ? When a clean ron mail is placed in a large sealed jar with a small amount of moisture present, the nail mill form rust over time. If mass measurements are made at the beginning of the experiment and again sereral weela lyter, which of the following will be observed? The mass of the clean nail will be equal to the mass of the nail plus rust. The mass of the clean nail will be greater than the mass of the nail plus rust The mass of rust will be equal to the original mass of the oxygen in the jar, SELECTIVIDAD En un matraz cerrado de 5 L hay 42 g de \( \mathrm{N}_{2} \) a \( 27^{\circ} \mathrm{C} \). a) Determine la presión en el interior del matraz. b) Se deja salir nitrógeno hasta que la presión interior sea de 1 atm. Calcule cuántos gramos de \( \mathrm{N}_{2} \) han salido del matraz. c) ¿A qué temperatura deberíamos poner el recipiente para recuperar la presión inicial? Dato: Masa atómica \( \mathrm{N}=14 . \mathrm{R}=\mathbf{0}^{\prime} 082 \mathrm{~atm} \cdot \mathrm{~L} \cdot \mathrm{~mol}^{-1} \cdot \mathrm{~K}^{-1} \) QUIMICA. 2016. RESERVA 3. EJERCICIO 2. OPCIÓN B \( \begin{array}{ll}\text { 3.46. } & \text { 3-clorobut-2-enal } \\ \text { 3.47. } & \text { 2-metilciclopentanol } \\ \text { 3.48. } & \text { butanamida } \\ \text { 3.49. } & \text { Ácido acético (ácido etanoico) }\end{array} \) When a COVALENT compound (such as ICE or WAX) MELTS, this is due to... [NONE of these] the LIQUEFACTION of the atoms themselves the breaking of the INTERMOLECULAR FORCES the breaking of the COVALENT BONDS within the molecule [TRUE or FALSE?] Ionic bonds form between metals and non- metals. \( \begin{array}{r}\text { [FALSE]: Metals form NEGATIVE ions and } \\ \text { non-metals form POSITIVE ions as } \\ \text { electrons are SHARED to form covalent } \\ \text { bonds }\end{array} \) \( \begin{array}{r}\text { [FALSE]: Electrons are SHARED to form } \\ \text { COVALENT bonds between metals and } \\ \text { non-metals }\end{array} \) \( \begin{array}{r}\text { [TRUE]: Metals form POSITIVE ions and } \\ \text { non-metals form NEGATIVE ions as } \\ \text { electrons are TRANSFERRED. }\end{array} \) S5 \( 0,1 \mathrm{~mol} \mathrm{SO}_{3} \) gazı 5,6 litrelik kapta \( 273^{\circ} \mathrm{C} \) lik sıcak-likta kaç cmHg basınç yapar? 4) Apagıda varilen maddalarden hangisi suda çö- zöndogonda oriamda bulunan H' iyon derişimini artırir? \( \begin{array}{ll}\text { A) } \mathrm{KOH} & \text { B) } \mathrm{NH}_{3} \\ \text { C) } \mathrm{H}_{2} \mathrm{SO}_{4} & \text { () } \mathrm{KNO}_{3}\end{array} \)
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