Questions by EssieHimes15

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1 answer 49 views

Calculate the lattice energy of magnesium oxide (MgO) given that the ionic radii for Mg2+ and O2- are 0.72 Å and 1.40 Å respectively, and the lattice energy of MgO is -3795 kJ/mol.

asked Jan 23 in Inorganic Chemistry

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1 answer 7 views

A student wants to electroplate a nickel wire with copper. The student has 1 g of copper sulfate and a 2 M solution of sulfuric acid. The wire has a surface area of 3 cm², and the desired copper thickness on the wire is 0.025 cm. How long should the student electroplate the wire with a current of 1.5 A to achieve the desired thickness of copper? Calculate the current density in the electrochemical cell.

asked Jan 22 in ElectroChemistry

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1 answer 47 views

A container contains 2 moles of a gas at a pressure of 8 atm and a temperature of 300 K. Calculate the volume of the gas in each of the following thermodynamic ensembles: microcanonical, canonical, and grand canonical ensembles.

asked Jan 22 in Physical Chemistry

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1 answer 4 views

A chemistry student wants to determine the percentage of ethanol in a sample of wine. The student takes a 50 mL aliquot of the wine, dries it, and finds the weight of the residual solids to be 0.325 g. The student then distills the rest of the wine, evaporates the distillate to dryness, and finds the weight of the residue to be 2.324 g. Using mass balance calculations, what is the percentage of ethanol in the wine sample?

asked Jan 22 in Analytical Chemistry

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1 answer 37 views

What is the role of an observer in observational psychology?

asked Jan 15 in Psychology

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1 answer 43 views

Why do players with more mass often have a larger impact in football?

asked Jan 8 in Science

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1 answer 56 views

Where in the cell does transcription occur?

asked Jan 8 in Science

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1 answer 45 views

When a solid substance is involved in a chemical reaction, only the matter from which part of the solid is exposed to other reactants?

asked Jan 8 in Science

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1 answer 58 views

What occurs when muscle fibers get shorter?

asked Jan 7 in Science

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