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A chemistry student needs to analyze the composition of a soil sample using elemental analysis. The student has to determine the percentage of carbon, nitrogen, and sulfur present in the sample. How can the student perform elemental analysis and calculate the percentage of each element in the soil sample accurately?

asked Jan 22 in Analytical Chemistry by JanniePeek84 (2.1k points)

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A chemistry experiment was conducted to determine the rate constant for the reaction between hydrogen peroxide and iodide ion in acidic medium. The initial concentrations of hydrogen peroxide and iodide ion were 0.2 M and 0.1 M respectively. The reaction was carried out at 25°C and the time taken for the completion of the reaction was 60 seconds. Based on these data, what is the rate constant for the reaction?

asked Jan 22 in Chemical kinetics by MoniqueBrins (2.1k points)

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What is the product formed when 1-bromobutane is reacted with aqueous sodium hydroxide? Draw the mechanism that explains the reaction pathway of this nucleophilic substitution reaction.

asked Jan 21 in Organic Chemistry by EdgardoHinch (2.3k points)

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Identify the major product(s) of the following nucleophilic substitution reaction:CH3Br + NH2OH → ?

asked Jan 21 in Organic Chemistry by DaisyThwaite (2.1k points)

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A chemistry student is given an unknown mystery organic compound and is asked to identify it using mass spectrometry. The student must explain the steps they would take with a mass spectrometer to accurately determine the compound’s identity and provide a detailed analysis of the results obtained.

asked Jan 22 in Analytical Chemistry by ErickB565479 (2.6k points)

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Identify the functional group present in the compound C6H5CHO and name the reaction(s) it undergoes when treated with HCN.

asked Jan 21 in Organic Chemistry by RoseIqw0722 (3.0k points)

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A sample of an unknown inorganic compound weighing 6.25 grams was analyzed to determine its empirical and molecular formulas. After combustion, the sample produced 9.375 grams of carbon dioxide and 3.125 grams of water. What is the empirical and molecular formula of the inorganic compound?

asked Jan 22 in Inorganic Chemistry by BrentAshcrof (2.0k points)

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A chemistry student is given a sample of a solution containing a known amount of sodium chloride (NaCl) dissolved in water. The student needs to determine the concentration of the NaCl in the solution, using mass balance calculations. The student has access to a balance and other necessary laboratory equipment. What is the concentration of NaCl in the solution given to the student? How much NaCl is present in the solution, and how much water was used to dissolve it?

asked Jan 22 in Analytical Chemistry by JackH2065356 (2.6k points)

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A chemical mixture containing 30% ethanol and 70% water needs to be separated using a distillation column. The feed rate is 1000 kg/hr and the desired purity for both products is 99%. The distillation column has 20 theoretical trays, and the reflux ratio is 2.5. Determine the number of trays required to achieve the desired purity for both products.

asked Jan 22 in Chemical engineering by StephaniaTkt (2.3k points)

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What is the IUPAC name of the compound CH3CH2NH2?

asked Jan 21 in Organic Chemistry by EloisaPtm353 (1.9k points)

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Identify the chirality centers in the compound (2R,3S)-butanedioic acid and draw all possible stereoisomers. Determine which of the stereoisomers is the enantiomer of (2R,3S)-butanedioic acid.

asked Jan 21 in Organic Chemistry by ValentinStec (2.4k points)

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A sealed vessel contains a mixture of nitrogen dioxide and dinitrogen tetraoxide gases in equilibrium. If the volume of the container is increased, would the equilibrium shift towards more or less NO2? Calculate the new equilibrium constant at the new volume assuming the pressure and temperature remain constant.

asked Jan 22 in Chemical equilibrium by ArlenBieber1 (2.7k points)

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What products are formed from the electrophilic addition reaction between propene and hydrogen bromide?

asked Jan 21 in Organic Chemistry by ElenaBriscoe (2.3k points)

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What products are expected from the reaction of 1-bromobutane with sodium hydroxide in aqueous solution, and why?

asked Jan 21 in Organic Chemistry by MarianneBarc (2.1k points)

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What is the IUPAC name of the straight-chain alkane that has 12 carbon atoms?

asked Jan 21 in Organic Chemistry by ChasityBelli (3.0k points)

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A chemistry student needs to determine the effect of adding NaCl to a solution containing AgNO3 at equilibrium. The original solution had concentration [Ag+]=0.01M and [NO3-]=0.01M, and Ksp=1.8x10^-10. How much NaCl (in grams) is needed to be added to the solution in order to decrease the [Ag+] concentration by a factor of 10?

asked Jan 22 in Chemical equilibrium by SenaidaDelac (2.2k points)

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A certain polymerization reaction has a ΔH°rxn of -250 kJ/mol. If you need to make 500 grams of the polymer, how much energy in kilojoules will be released or absorbed during the reaction?

asked Jan 22 in ThermoChemistry by DanClay0864 (2.4k points)

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A copper rod with a surface area of 5 cm² is coupled with an iron rod with a surface area of 10 cm² to form a galvanic cell. When the circuit is closed, the current flows for 2 hours and the weight loss of the iron rod was found to be 0.58 g. Determine the corrosion rate of the iron rod in millimeters per year (mm/yr) assuming a density of 7.86 g/cm³ for the iron.

asked Jan 22 in ElectroChemistry by BobBar745884 (2.3k points)

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What is the chemical reaction involved in converting an amine into an amide? Write a balanced chemical equation and list the reagents used in the process.

asked Jan 21 in Organic Chemistry by MaxwellDuff3 (2.3k points)

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Calculate the enthalpy change for the following combustion reaction:C2H6(g) + 7/2 O2(g) --> 2CO2(g) + 3H2O(l)Using the following reactions and their corresponding enthalpies of formation:C2H6(g) + 3 1/2 O2(g) --> 2CO2(g) + 3H2O(l) ΔH°f = -1560 kJ/mol2H2(g) + O2(g) --> 2H2O(l) ΔH°f = -484 kJ/mol.

asked Jan 23 in ThermoChemistry by Sylvia941924 (2.4k points)

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