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Home Question Bank Chemistry Archive 2025 January 13

Chemistry Questions from Jan 13,2025

Browse the Chemistry Q&A Archive for Jan 13,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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Jse the table of Thermodynamic properties of pure substances table to obtain the necessary values for each substance. Calculate the heat of combustion for the following reaction. Use the standard enthalpies of formation. Round your answer to the nearest \( \frac{\mathrm{kJ}}{\mathrm{mol}} \). \[ 2 \mathrm{CH}_{3} \mathrm{OH}(\mathrm{l})+3 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{~g})+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \] Select which of the following standard enthalpy of formation values is not zero at \( 25^{\circ} \mathrm{C} \) : Check all that apply. \[ \square \mathrm{CH}_{4}(g) \] \( \square \mathrm{S}_{8} \) (rhombic) \( \square \mathrm{HCO}_{2}(\mathrm{~s}) \) \( \square \mathrm{None}^{\circ}(g) \) \( \square \) 1. Explain the formation of an ionic compound from zinc and chlorine. Determine the amount of heat (in kJ ) associated with the production of \( 1.21 \times 10^{4} \mathrm{~g} \) of \( \mathrm{NO}_{2} \) according to the following equation: \[ 2 \mathrm{NO}(g)+\mathrm{O}_{2}(g) \rightarrow 2 \mathrm{NO}_{2}(g) \quad \Delta H=-114.6 \frac{\mathrm{~kJ}}{\mathrm{~mol}} \] Be sure your answer has the correct number of significant digits. FRAZIONE MOLARE E MOLALITA 27. 5 g di NaOH vengono sciolti in \( 200 \mathrm{~cm}^{3} \) di acqua. Calcola: a. la frazione molare del soluto b. la frazione molare del solvente que contiene 1.2 moles de \( \mathrm{Na}_{2} \mathrm{SO}_{4} \) douetion en 0.8 kg de agua. What is a potential source of chemicals that can be introduced to the environment from agricultural practices? A. Pesticides and fertilzers B. Household eleaners G. Automobile exhaust Tentukan besar nomor massa, nomor atom dari unsur berikut, dan jumlah proton, Neutron dan electron dari unsur berikut: \( \begin{array}{ll}\text { a. } C s_{55}^{133} & \text { c. } B r_{35}^{80} \\ \text { b. } M n_{25}^{55} & \text { d. } K r_{36}^{84}\end{array} \) [ 4 marks] a) What is the molar heat capacity? b).5 joules are required to raise the temperature of 25.0 g of Ethylene glycol by 1.00 degree celcius or \( 1,00 \mathrm{~K} \). What is the specific heat? [ 4 marks] a) Briefly describe the following. [ 8 marks] Page: Date : 9. the element that is in the secand pering and has a half-rillef \( p \) subshell with electrons in its atomil state is a) 08 6) N 7 c) \( B_{5} \) d) \( S+6 \) 10 - the substance that ionizes according to the expation moH \( \rightarrow \mathrm{M}^{+}+\mathrm{OH}^{-} \)is a) mineral acits b) orgonic acis c) sayts d) Al Kalis 13- which of the followingelements has the lomest seconf joniz ation energy a) \( \mathrm{B}_{5} \) b) \( N_{\text {NOl }} \) c) \( N_{7} \) d) \( 5, t \) 15-which of the foblowing is considerd a non metar oxise a) reacts with bases to give salt and acid 6) Dissolve in water to give abasic solution c) reacts with bases to give sult anf water d) reacts with acits to give saits ond water 18-the number of electrons for the elemont \( \operatorname{zin}\left(\mathrm{Zn}_{30}\right. \) in the 3 d subshell is a) 7 b) 9 c) 8 d) 10 22- IJentify the type of change from exisetion and reduction for both sulfur and iodine \( \left(\mathrm{H}_{2} \mathrm{~S}+\mathrm{I}_{2} \rightarrow \mathrm{~S}+2 \mathrm{H}^{+}+\mathrm{I}^{-}\right) \)indicate the exidizing agent and the reducingagent A
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