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Home Question Bank Chemistry Archive 2024 December 03

Chemistry Questions from Dec 03,2024

Browse the Chemistry Q&A Archive for Dec 03,2024, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Which of the following is a true statement about atomic nuclei? (A) They are made up of protons, neutrons, and electrons (C) Every atomic nucleus has the same number of particles (D) The atomic nucleus has no relation to an atom's mass ¿Cuál es la represeritación de la estuaturas electrónica del elemento hierno (Fe). A nuclide of \( { }_{29}^{64} \mathrm{Cu} \) absorbs a positron. Which is the resulting atom? \( { }_{29}^{65} \mathrm{Cu} \) \( { }_{29}^{63} \mathrm{Cu} \) \( { }_{28}^{64} \mathrm{Ni} \) \( { }_{30}^{64} \mathrm{Zn} \) 5. **Arrange each set of ions in order of decreasing size. Briefly explain your reasoning. \( \mathrm{Na}, \mathrm{Na}^{+1}, \mathrm{Decreasing} \) atomic size: Reasoning: 6. *Which element forms an ion that is larger than its atom? a. aluminum b. chlorine 7. *How does the size of a barium ion compare to the size of a barium atom? a. The ion is smaller because it has fewer electrons. b. The ion is smaller because it has more electrons. c. The ion is larger because it has fewer electrons. d. The ion is larger because it has more electrons. 3. ** Which of the following has the largest radius? \( \begin{array}{ll}\text { a. } N^{3-} & \text { b. } O^{2-} \\ \text { 4. } F^{-} & \text {d. Ne }\end{array} \) 1. \( { }^{* *} \) When an atom becomes a positive ion, the radius of the atom \( \begin{array}{ll}\text { a. decreases } \\ \text { b. increases } & \text { c. remains the same }\end{array} \) \( \begin{array}{ll}\text { 2. }{ }^{* *} \text { When an atom becomes a negative ion , the radius of the atom } \\ \text { b. increases } & \text { c. remains the same }\end{array} \) 14 Si les dues reaccions es produeixen a pressió constan: a \( 200^{\circ} \mathrm{C} \), calculán la variació d'energia interna: a \( \mathrm{SO}_{2}(\mathrm{~g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{SO}_{3}(\mathrm{~g}) \) \( \Delta H=-96 \mathrm{~kJ} \mathrm{~mol}^{-1} \) b \( \mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g}) \quad \Delta H=-393,3 \mathrm{~kJ} \mathrm{~mol}^{-1} \) 13 La reacció de síntesi de l'amoníac a volum constant i a \( 25^{\circ} \mathrm{C} \) ve determinada per l'expressió: \( \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightarrow \) \( \rightarrow 2 \mathrm{NH}_{3}(\mathrm{~g}) \). Quan reacciona un mol de nitrogen, es des- prèn una calor de 41 kJ . Determina quina calor es desprèn quan aquesta reacció té lloc a la mateixa temperatura i a la pressió constant d'una atm. Use the References to access important valuas if needed for this question. How many protons, neutrons and electrons are there in a neutral atom of the isotope with the nuclear symbol: \[ \begin{array}{l}67 \\ \text { protons: } \\ \text { neutrons: } \\ \text { electrons: }\end{array} \] Which chemical equation represents a precipitation reaction? \[ \mathrm{A} . \quad \mathrm{MgBr}_{2}+2 \mathrm{HCl} \rightarrow \mathrm{MgCl}_{2}+2 \mathrm{HBr} \]
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