Recent activity by MaggieSpradl

1 answer 23 views

Calculate the standard heat of formation of water (H2O) using the bond dissociation energies of H2 and O2 and the standard heat of combustion of methane (CH4).

asked 2 days ago in Chemical bonding

1 answer 63 views

What is the concentration of copper ions in a given sample using polarography, if the measured peak current is 2.56 μA and the standard potential of the copper ion electrode is +0.34 V (vs. SCE)?

asked 6 days ago in Analytical Chemistry

1 answer 90 views

How to identify the presence of lead and cadmium in a soil sample using X-ray fluorescence spectroscopy?

answered 6 days ago in Analytical Chemistry

1 answer 38 views

Calculate the exchange current density for the redox reaction: Fe2+ + Cr2O72- + 14H+ → 2Fe3+ + 2Cr3+ + 7H2O Given that the standard potential for the reaction at 25°C is 1.33 V, the gas constant is 8.314 J/mol K, and the temperature is 298 K.

answered Jan 23 in ElectroChemistry

1 answer 62 views

Calculate the enthalpy of polymerization of ethylene from the following data: Ethylene, C2H4(g) polymerizes to form polyethylene, (C2H4)n(s) with ΔHrxn = -44.0 kJ/mol at 298 K. Additionally, it is known that the standard enthalpies of formation of C2H4(g) and polyethylene (C2H4)n(s) are 52.3 kJ/mol and -128.2 kJ/mol, respectively. Assuming the enthalpy of polymerization is independent of temperature, calculate ΔHºp for the reaction.

asked Jan 23 in ThermoChemistry

1 answer 36 views

A 5 g sample of a mixture containing sand and salt is dissolved in water. The solution is filtered, and the sand is collected and dried. The dried sand has a mass of 3 g. Using mass balance calculations, determine the percentage of salt in the original mixture.

asked Jan 22 in Analytical Chemistry

1 answer 56 views

What is the modularity theory?

answered Jan 15 in Psychology

1 answer 26 views

How can classical conditioning be applied in the treatment of phobias?

asked Jan 15 in Psychology

1 answer 24 views

What is the 'availability heuristic'?

asked Jan 14 in Psychology

1 answer 5 views

What is the definition of a psychological disorder?

asked Jan 14 in Psychology

1 answer 20 views

Which group of the periodic table consists of hydrogen and the alkali metals?

answered Jan 8 in Science

1 answer 21 views

When volcanoes erupt, what from the mantle is released as carbon dioxide into the air?

asked Jan 8 in Science

1 answer 7 views

What do you call a reaction that consumes energy as it is carried out?

asked Jan 6 in Science

1 answer 20 views

What do omnivores eat?

answered Jan 6 in Science

1 answer 25 views

The partial pressure of each gas in a mixture is proportional to its what?

answered Jan 2 in Science

1 answer 22 views

In recent years, however, researchers have discovered that microsporidia actually have tiny organelles derived from what?

answered Dec 27, 2024 in Science

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