Recent questions in Chemistry

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Assuming complete reaction, a chemistry student added 32 grams of reactant A to a reaction mixture that should produce 28 grams of product B. However, the actual yield of B was only 22 grams. What is the percent yield of product B for this chemical reaction?

asked Jan 22 in Chemical reactions by Louie80C6010 (550 points)

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Assuming complete combustion, what is the amount of heat energy released when 25 grams of methane (CH4) is burned completely in oxygen gas (O2)? The enthalpy of combustion for methane is -890.4 kJ/mol.

asked Jan 22 in ThermoChemistry by ThadAtkin30 (290 points)

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Assuming a standard hydrogen electrode is used as the reference electrode and a copper electrode is used as the working electrode in an electrochemical cell, calculate the polarization potential when the current density on the copper electrode is 0.5 mA/cm^2 and the concentration of Cu2+ in the solution is 0.1 M.

asked Jan 22 in ElectroChemistry by ElvinRawls02 (290 points)

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Assuming a chemical equilibrium reaction aA + bB ⇌ cC + dD, with initial concentrations of [A] = 0.2 M, [B] = 0.3 M, [C] = 0 M, and [D] = 0 M at 25°C, what will be the new equilibrium concentration of [B] if the volume of the container is decreased to half the original volume?

asked Jan 22 in Chemical equilibrium by MichaleSalis (350 points)

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Assuming a carbon-carbon double bond length of 1.33 Å and a carbon-hydrogen single bond length of 1.09 Å, what is the approximate bond length of a carbon-carbon triple bond in a molecule with a linear geometry?

asked Jan 22 in Physical Chemistry by MaybelleKram (430 points)

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Assume a reaction where magnesium (Mg) reacts with chlorine (Cl2) to produce magnesium chloride (MgCl2). If we start with 10 grams of magnesium and 20 grams of chlorine, what mass of magnesium chloride can we produce?

asked Jan 22 in Chemical reactions by Jarred13J883 (230 points)

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1 answer 50 views

Assume a reaction has reached equilibrium in a 1-liter container. If the volume is now reduced to 0.5 liters, what is the effect on the equilibrium position of the reaction?

asked Jan 22 in Chemical equilibrium by LeoraPolk429 (350 points)

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1 answer 35 views

As a chemistry student, how can you determine the effect of temperature on the conductivity of 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid?

asked Jan 22 in Physical Chemistry by DessieFisher (490 points)

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As a Chemistry student, analyze the environmental impact of an industrial project that involves the production of fertilizers, and suggest ways to mitigate its negative impact on the environment.

asked Jan 22 in Environmental Chemistry by DarellBoothm (150 points)

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1 answer 43 views

Analyzing the presence and concentration of heavy metals in landfill leachate and determining their impact on groundwater quality: A case study in a selected landfill site.

asked Jan 22 in Environmental Chemistry by LillieIst935 (310 points)

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Analyzing the levels of pesticide residues in commonly consumed fruits and vegetables and their potential health effects on humans: A case study in a specific region.

asked Jan 22 in Environmental Chemistry by MerryLaufer9 (730 points)

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Analyzing the effects of molecular weight and temperature on the flow behavior and viscosity of polymer melts using rheological measurements: a comparative study between polyethylene and polypropylene melts.

asked Jan 22 in Polymer Chemistry by KamGjz98074 (470 points)

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An unknown compound was discovered in a crime investigation. Use mass spectrometry to identify the molecular formula and possible functional groups present in the compound.

asked Jan 22 in Analytical Chemistry by JulianH26614 (430 points)

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An unknown compound was analyzed using mass spectrometry, and the resulting spectrum showed a molecular ion peak at m/z 214. Fragmentation patterns were also observed with peaks at m/z 121 and m/z 93. Can you identify the unknown compound and explain the fragmentation pathways leading to the observed peaks?

asked Jan 22 in Analytical Chemistry by DavidSalvado (430 points)

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An unknown compound is synthesized in the lab and needs to be identified using mass spectrometry. Design a step-by-step plan to analyze the compound, including sample preparation, instrument settings, interpretation of data, and identification of possible functional groups.

asked Jan 22 in Analytical Chemistry by Carl54E51641 (210 points)

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An unknown compound is suspected to be a crystal structure of sodium chloride. Using X-ray crystallography techniques, determine if the compound is indeed a sodium chloride crystal structure and calculate the lattice parameters of the crystal.

asked Jan 22 in Physical Chemistry by IXYReda4687 (250 points)

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An organic compound was synthesized in the laboratory. The compound is known to contain three functional groups - an alcohol, an alkene, and an ester. Using IR spectroscopy, a broad peak was observed in the region between 3200-3400 cm^-1, which indicates the presence of the alcohol group. However, two different peaks were observed in the region between 1640-1680 cm^-1, which could correspond to either the alkene or ester group. Using other spectroscopic techniques such as NMR and mass spectrometry, determine the structure of the compound and identify which peak corresponds to the alkene or ester functional group.

asked Jan 22 in Organic Chemistry by TammySlocum9 (470 points)

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1 answer 49 views

An industrial process involves the reaction of nitrogen gas and hydrogen gas to produce ammonia gas, in the presence of a catalyst. If the equilibrium constant for this reaction at a certain temperature is 6.2 × 10^-2 and the initial concentrations of nitrogen and hydrogen gases are 1.2 M and 0.8 M respectively, what would be the equilibrium concentrations of the reactants and products if the catalyst increases the rate of the forward reaction by a factor of 4?

asked Jan 22 in Chemical equilibrium by TeshaGoris7 (460 points)

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1 answer 26 views

An electrochemical cell has a standard emf of 1.10 V and a current of 0.500 A when operating at standard conditions. What is the power output of the cell?

asked Jan 22 in ElectroChemistry by Bev61U395019 (410 points)

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1 answer 56 views

An aqueous solution of 1.0 M HCl is oxidized by a lead anode in a half-cell, while a half-cell with a hydrogen electrode is used as the standard reduction potential. If the electrode potential of the lead electrode is -0.13 V, what is the cell potential of the overall reaction?

asked Jan 22 in ElectroChemistry by RuebenBarnes (550 points)

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