Recent activity by GRXColleen50

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How do changes in the composition of perovskite materials affect their electronic and optical properties, and what are the most effective methods for calculating and predicting these properties?

answered 4 days ago in Quantum Chemistry

1 answer 56 views

How accurately can we determine the purity of a given sample of a substance using melting point determination and what are the possible sources of error in this process?

answered Jan 29 in Analytical Chemistry

1 answer 52 views

Calculate the heat of crystallization for NaCl from the given data:The enthalpy of fusion of NaCl = 28.3 kJ/mol and the heat capacity of NaCl is approximately constant at 40.0 J/mol.K for temperatures close to room temperature. The melting point of NaCl is 801 °C and the density of the solid NaCl is 2.16 g/cm³.

asked Jan 23 in ThermoChemistry

1 answer 52 views

A chemistry student wants to determine the concentration of a solution containing iron (III) ions. Using colorimetry, they measure the absorbance of the solution at a specific wavelength and plot a calibration curve with solutions of known iron (III) ion concentration. The student then measures the absorbance of their unknown solution at the same wavelength and uses the calibration curve to determine the concentration of iron (III) ions in the sample. What is the concentration of iron (III) ions in the unknown solution, in units of moles per liter?

asked Jan 22 in Analytical Chemistry

1 answer 20 views

According to Transactional Theory, what are the two types of leaders?

answered Jan 20 in Psychology

1 answer 21 views

According to the evolutionary approach, why do we form relationships?

answered Jan 20 in Psychology

1 answer 30 views

According to the Integrated Information Theory, what is consciousness?

answered Jan 20 in Psychology

1 answer 40 views

How does Terror Management Theory relate to end-of-life care for individuals with a strong cultural identity?

asked Jan 20 in Psychology

1 answer 17 views

What criticisms have been lodged against social learning theory?

asked Jan 16 in Psychology

1 answer 18 views

What is the multimodal therapy approach?

answered Jan 16 in Psychology

1 answer 23 views

What is the Big Five personality theory?

asked Jan 15 in Psychology

1 answer 17 views

When evaluating the effectiveness of cognitive behavioural therapy, what is meant by maintenance of gains?

asked Jan 15 in Psychology

1 answer 18 views

According to Erikson, when does the trust vs. mistrust stage occur?

asked Jan 15 in Psychology

1 answer 26 views

What is the socio-economic selectivity theory?

answered Jan 14 in Psychology

1 answer 34 views

What is the impact of substance use on adolescent development?

asked Jan 14 in Psychology

1 answer 23 views

What is the core assumption of the cognitive perspective?

asked Jan 13 in Psychology

1 answer 49 views

What is extinction in behaviourism?

asked Jan 13 in Psychology

1 answer 8 views

Which members of the food chain break down remains of plants and other organisms when they die?

answered Jan 8 in Science

1 answer 37 views

What substances dissociate into ions when dissolved in water?

answered Jan 7 in Science

1 answer 51 views

In contrast to precision, this term means how close a measurement is to the correct or accepted value of the quantity being measured?

asked Dec 31, 2024 in Science

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