Recent activity by TedHallstrom

1 answer 24 views

How can the sensitivity of Surface-enhanced Raman spectroscopy (SERS) be optimized for the detection of low concentration of analytes on a metallic substrate?

answered 17 hours ago in Surface Chemistry

1 answer 21 views

How can the properties of polyurethane be optimized by varying the ratio of diisocyanate and polyol in the synthesis process?

answered 18 hours ago in Chemical synthesis

1 answer 65 views

How can X-ray fluorescence spectroscopy be utilized to identify the presence of toxic heavy metals, such as lead and cadmium, in a given sample of soil?

answered Jan 30 in Analytical Chemistry

1 answer 58 views

How can the composition of a mineral sample be analyzed using X-ray diffraction to determine its crystal structure and chemical composition?

asked Jan 29 in Analytical Chemistry

1 answer 54 views

Calculate the Gibbs free energy change for the electrochemical reaction in which 2 moles of electrons are transferred from a zinc electrode to a copper electrode. The standard reduction potentials are E°(Cu²⁺/Cu) = 0.34 V and E°(Zn²⁺/Zn) = -0.76 V. What is the spontaneity of the reaction under standard conditions?

answered Jan 23 in ElectroChemistry

1 answer 61 views

A chemistry student wants to mix 50 mL of water at 25°C with 50 mL of ethanol at 25°C to make a solution. The heat of mixing for water and ethanol is -21.2 kJ/mol. Calculate the heat (in kJ) absorbed or released when the two liquids are mixed. (Assume the densities of water and ethanol are approximately 1 g/mL and 0.8 g/mL, respectively.)

asked Jan 22 in ThermoChemistry

1 answer 29 views

When was mindfulness-based cognitive therapy MBCT introduced?

asked Jan 20 in Psychology

1 answer 52 views

Who developed the transtheoretical model?

answered Jan 20 in Psychology

1 answer 23 views

What is Bowen's theory?

asked Jan 15 in Psychology

1 answer 32 views

What is the role of the cochlea in hearing?

asked Jan 14 in Psychology

1 answer 60 views

Which direction does the sun, moon, and stars appear to travel?

asked Jan 8 in Science

1 answer 63 views

What carries blood away from the heart?

answered Jan 6 in Science

1 answer 12 views

Maintaining a balance inside the body or cells of organisms is known as?

answered Dec 31, 2024 in Science

1 answer 45 views

Dissolved fertilizer can ultimately lead to the creation of what in lakes or coastal oceans, which means a place where nothing can live?

asked Dec 30, 2024 in Science

1 answer 13 views

Some viruses carry a few viral enzyme molecules within their what?

asked Dec 27, 2024 in Science

1 answer 10 views

In which part of the ear are the vibrations amplified by the malleus, incus, and stapes?

asked Dec 27, 2024 in Science

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