Questions by NorineFelici

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1 answer 42 views

Determine the maximum monolayer coverage of nitrogen gas on a silver surface in Langmuir units if the partial pressure of nitrogen gas is 2.5 atm at 298 K. The area per molecule of nitrogen adsorbed on the silver surface is known to be 1.55×10^-19 m^2 according to experimental data.

asked Feb 4 in Surface Chemistry

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1 answer 45 views

Calculate the standard enthalpy change for the reaction: Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) Given the following standard enthalpy of formation values: ΔHf° [Fe2O3(s)] = -824 kJ/mol ΔHf° [CO(g)] = -110 kJ/mol ΔHf° [CO2(g)] = -393.5 kJ/mol ΔHf° [Fe(s)] = 0 kJ/mol.

asked Feb 3 in Chemical thermodynamics

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1 answer 86 views

How can the practical applications of chemistry be emphasized more in the classroom to better prepare students for real-world chemistry situations and careers?

asked Jan 30 in Chemical education

+1 vote

1 answer 58 views

Using X-ray diffraction, analyze the crystal structure and determine the chemical composition of an unknown mineral sample provided.

asked Jan 30 in Analytical Chemistry

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1 answer 75 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?

asked Jan 30 in Analytical Chemistry

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1 answer 67 views

Calculate the equilibrium constant (Kc) for the reaction between nitrogen gas (N2) and hydrogen gas (H2) to form ammonia gas (NH3) at a temperature of 400 K. The reaction is written as follows: N2(g) + 3H2(g) ⇌ 2NH3(g) Given the equilibrium concentrations are [N2] = 0.10 M, [H2] = 0.20 M, and [NH3] = 1.0 M.

asked Jan 23 in Chemical thermodynamics

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1 answer 10 views

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

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1 answer 57 views

A chemistry student needs to determine the concentration of a certain analyte in a water sample using colorimetry. The student has access to a spectrophotometer and a standard calibration curve. What is the concentration of the analyte in the water sample, given its absorbance value in the spectrophotometer and the calibration curve data?

asked Jan 22 in Analytical Chemistry

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1 answer 38 views

What are the implications of the broaden-and-build theory for positive psychology?

asked Jan 20 in Psychology

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1 answer 67 views

What is the role of genetics in cognitive aging?

asked Jan 17 in Psychology

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1 answer 10 views

Why is functional magnetic resonance imaging fMRI useful in neuropsychology research?

asked Jan 17 in Psychology

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1 answer 33 views

What is the difference between crystallized and fluid intelligence?

asked Jan 17 in Psychology

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1 answer 59 views

What is a criticism of using AI in cognitive models?

asked Jan 16 in Psychology

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1 answer 34 views

Who proposed the prospect theory?

asked Jan 15 in Psychology

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1 answer 14 views

What are the main types of textual reference sources used in psychology research?

asked Jan 15 in Psychology

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1 answer 65 views

How do individual differences influence adolescent development?

asked Jan 14 in Psychology

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1 answer 36 views

What is the frequency theory of hearing?

asked Jan 13 in Psychology

0 votes

1 answer 15 views

Compare and contrast the self-report and behavioural measures in psychological research.

asked Jan 10 in Psychology

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1 answer 40 views

What leads to multiple copies of a chromosomal region?

asked Jan 7 in Science

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1 answer 55 views

What is the effect on pressure when the area of applied force is very concentrated?

asked Jan 6 in Science

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