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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 MervinSchroe (2.4k 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 MonteEsteban (2.6k points)

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What is the oxidation state of chromium in K2Cr2O7?

asked Jan 21 in Inorganic Chemistry by TawannaPigot (2.3k points)

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Write the balanced chemical equation for the reaction of sodium chloride (NaCl) with sulfuric acid (H2SO4) to form sodium sulfate (Na2SO4) and hydrochloric acid (HCl).

asked Jan 21 in Inorganic Chemistry by MarquisMonte (2.5k points)

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What is the major product formed when 1-bromo-2-methylcyclohexane is treated with sodium ethoxide in ethanol at a temperature of 60°C?

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

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What is the systematic name of the following compound? CH3CH2CH2OH

asked Jan 21 in Organic Chemistry by FawnSharrow (2.5k 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 KrystleFarth (2.8k points)

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A student wants to determine the specific surface area of a solid sample using gas adsorption. The sample has a mass of 1 gram and the adsorption isotherm follows the BET model. The student measures the volume of nitrogen gas adsorbed at different pressures and obtains the following data:Pressure (torr) | Volume of nitrogen (cm3)---------------|----------------------- 50 | 24.51 100 | 39.22 200 | 67.38 300 | 90.86 400 | 104.29What is the specific surface area of the sample based on the BET model?

asked Jan 22 in Surface Chemistry by CheryleKirso (2.3k 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 MerriLondon (2.5k points)

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What is the oxidation state of the chromium ion in the compound K2CrO4?

asked Jan 21 in Inorganic Chemistry by MarcyWoolery (3.3k 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 AlishaGuy35 (2.3k 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 MarianCocket (2.4k points)

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A voltaic cell consists of a standard hydrogen electrode and a copper electrode in a solution of copper(II) sulfate. The measured cell potential is 0.78 V at 25°C. If the concentration of copper(II) sulfate is 0.1 M, what is the resistance of the electrochemical cell?

asked Jan 22 in ElectroChemistry by RosemarieKin (2.6k points)

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How many stereoisomers are possible for a molecule with one chiral center that has a substituent group containing a double bond and a methyl group bonded to it?

asked Jan 21 in Organic Chemistry by RosieBloom03 (2.2k points)

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Identify the major product (or products) of the following reaction: In the presence of a strong acid catalyst, a primary alcohol R-CH2OH is treated with an excess of hydrogen halide (HX).

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

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What is the major product formed when 2-methylbutan-2-ol undergoes an E1 elimination reaction with concentrated sulfuric acid?

asked Jan 21 in Organic Chemistry by K29986283214 (2.7k points)

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What is the product of the electrophilic addition reaction between propene and hydrogen bromide in the presence of a peroxide initiator?

asked Jan 21 in Organic Chemistry by EdwardoO6191 (2.3k points)

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How many constitutional isomers can be obtained from the molecular formula C6H14?

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

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What is the major product obtained when 1-bromopropane reacts with sodium ethoxide in ethanol? Write the reaction mechanism for the reaction and name the type of nucleophilic substitution reaction that occurs.

asked Jan 21 in Organic Chemistry by Lizzie32E683 (2.3k points)

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What is the oxidation state of chlorine in the compound KClO4?

asked Jan 21 in Inorganic Chemistry by EdithLindt35 (2.1k points)

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