Recent activity by DoraSturm903

1 answer 43 views

What are the possible products and balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)?

asked Feb 22 in Chemical education

1 answer 41 views

How does the primary structure of a protein influence its three-dimensional structure and function?

answered Feb 22 in BioChemistry

1 answer 29 views

How does the molecular weight of a polymer affect its printability and mechanical properties when used as a material for 3D printing?

answered Feb 21 in Polymer Chemistry

1 answer 32 views

How does the coordination geometry of metal ions in metalloenzymes affect their catalytic activity? Provide examples of metalloenzymes with different coordination geometries and their corresponding functions.

answered Feb 19 in Coordination Chemistry

1 answer 38 views

How does the coordination chemistry of iron in hemoglobin facilitate its role in oxygen transport and binding in the human body?

asked Feb 19 in Coordination Chemistry

1 answer 35 views

What is the bond dissociation energy required to break the carbon-hydrogen bond in methane (CH4)? (Hint: the bond dissociation energy is the amount of energy required to break a bond and form separate atoms or molecules.)

asked Feb 18 in ThermoChemistry

1 answer 35 views

How does the addition of different types and concentrations of nanoparticles affect the thermal and mechanical properties of polymer nanocomposites?

asked Feb 17 in Polymer Chemistry

1 answer 33 views

How does the surface modification of biomaterials affect their biocompatibility and performance in medical applications?

answered Feb 17 in Surface Chemistry

1 answer 123 views

How can the production of surfactants be optimized to increase efficiency and reduce costs while also minimizing environmental impact through the use of more sustainable materials and processes?

answered Feb 10 in Chemical engineering

1 answer 40 views

How can the number of trays required for an efficient separation of a mixture in a distillation column be determined using the McCabe-Thiele method? Take the example of a mixture of ethanol and water and determine the minimum number of trays required to achieve a desired separation efficiency.

asked Feb 10 in Chemical engineering

1 answer 34 views

How can the levels of POPs be reduced in the environment? Investigate and propose a feasible solution for controlling persistent organic pollutants in soil and bodies of water.

answered Feb 7 in Environmental Chemistry

1 answer 38 views

Given a mixture of benzene and toluene, with a mole fraction of 0.6 and 0.4 respectively, design a distillation column with a reflux ratio of 2.5 to achieve a product purity of at least 99% for both components.

answered Feb 4 in Chemical engineering

1 answer 18 views

Calculate the standard enthalpy change for the vaporization of 1 mole of water at 100°C and 1 atm pressure. The enthalpy of formation of liquid water is -285.8 kJ/mol and the enthalpy of formation of water vapor is -241.8 kJ/mol.

asked Feb 3 in Chemical thermodynamics

1 answer 74 views

Calculate the standard enthalpy change for the precipitation reaction: AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq) Given that the standard enthalpy of formation (∆Hf) for AgNO3(aq), NaCl(aq), AgCl(s), and NaNO3(aq) are -123.1 kJ/mol, -407.3 kJ/mol, -127.0 kJ/mol, and -467.3 kJ/mol respectively.

answered Feb 3 in Chemical thermodynamics

1 answer 75 views

Calculate the standard enthalpy change for the fusion of 25 grams of ice at -10°C to liquid water at 20°C. The specific heat capacity of ice is 2.09 J/g°C, the specific heat capacity of water is 4.18 J/g°C, and the enthalpy of fusion of water is 6.01 kJ/mol.

asked Feb 3 in Chemical thermodynamics

1 answer 38 views

What is the concentration of lead in a water sample collected from a nearby river? analyze the sample using Atomic Absorption Spectroscopy and report the result in ppm.

asked Jan 31 in Analytical Chemistry

1 answer 137 views

How much sodium chloride (NaCl) can be obtained from a sample of 5 grams of sea salt, given that the percentage of NaCl in the sample is 85% and gravimetric analysis is being used for the quantification?

answered Jan 30 in Analytical Chemistry

1 answer 173 views

Determine the oxidation state of the sulfur atom in the compound H2SO4.

asked Jan 21 in Inorganic Chemistry

1 answer 94 views

When might PTSD symptoms initially appear?

answered Jan 20 in Psychology

1 answer 32 views

What is epistemology in psychology research?

asked Jan 17 in Psychology

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