Recent activity by BarbraVidal

1 answer 19 views

How does the size and charge of particles in a colloid system affect the stability and interactions between particles in the system?

asked 23 hours ago in Physical Chemistry

1 answer 13 views

What is the effect of changing the concentration of reaction products on the reaction rate of the chemical reaction between hydrochloric acid and sodium thiosulphate?

answered 3 days ago in Chemical kinetics

1 answer 23 views

How does the ligand environment of a transition metal complex affect its photochemical properties?

answered 4 days ago in PhotoChemistry

1 answer 30 views

How does the electronic configuration of transition metal cations influence the stability of their complexes, and how can this be used to predict the stability of inorganic compounds?

asked 5 days ago in Inorganic Chemistry

1 answer 24 views

What is the effect of temperature on the electrical conductivity of an ionic liquid consisting of tetraethylammonium chloride and ethylene glycol?

asked 5 days ago in Physical Chemistry

1 answer 22 views

How does the distance between metal ions affect the magnetic properties of molecular magnets? Can we predict the value of the magnetic moment based on the electronic structure and geometry of the molecule?

answered 5 days ago in Quantum Chemistry

1 answer 33 views

How does the binding of transcription factors to DNA regulate gene expression? Provide an explanation using specific examples.

asked Feb 17 in BioChemistry

1 answer 35 views

How can we design a drug that effectively targets specific neurotransmitter systems involved in the development of Alzheimer's disease, while avoiding off-target effects and minimizing side effects for patients?

answered Feb 12 in Medicinal Chemistry

1 answer 42 views

How can the conductivity and carrier mobility of a polymer-based electronic material be optimized to improve its performance as a semiconductor in electronic devices?

asked Feb 6 in Polymer Chemistry

1 answer 21 views

How can the composition of metal alloys be optimized to enhance their strength, durability, and resistance to high temperatures for aerospace applications?

answered Feb 6 in Materials Chemistry

1 answer 27 views

How can one improve the compatibility of two different polymers in a blend while maintaining their desired properties?

asked Feb 5 in Polymer Chemistry

1 answer 36 views

How can chemistry educators increase the relevance and visibility of chemistry in daily life to engage students and improve their understanding of the subject?

asked Feb 4 in Chemical education

1 answer 60 views

Here is a problem related to BET theory of multilayer adsorption for a chemistry student to solve:How many layers of nitrogen molecules can be adsorbed on the surface of a given amount of activated carbon if the monolayer coverage is 100 m²/g and the specific surface area of activated carbon is 1500 m²/g according to the BET theory?

answered Feb 4 in Surface Chemistry

1 answer 46 views

Given the enthalpy of solution of sodium hydroxide (NaOH) is -44.5 kJ/mol and the enthalpy of solution of hydrochloric acid (HCl) is -74.8 kJ/mol, calculate the enthalpy change for the precipitation reaction between NaOH and HCl, assuming all solutions are at a concentration of 1 M.

answered Feb 4 in ThermoChemistry

1 answer 40 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 Feb 3 in Chemical bonding

1 answer 67 views

Using mass spectrometry, identify the unknown compound X given the following key mass spectral data: molecular ion peak at m/z 112, base peak at m/z 91, and characteristic fragment peaks at m/z 73 and m/z 57. Provide a molecular structure proposal for compound X based on the mass spectral data.

answered Jan 30 in Analytical Chemistry

1 answer 57 views

Calculate the lattice energy of calcium fluoride (CaF2) given the following information: the ionic radii of Ca and F are 100 pm and 133 pm, respectively, the lattice energy of NaCl is 788 kJ/mol, and the Born-Lande equation constant is 2.56.

asked Jan 23 in Inorganic Chemistry

1 answer 90 views

A chemistry student is required to calculate the activation energy of a chemical reaction. Given the rate constant of a reaction at two different temperatures, what is the activation energy?

asked Jan 22 in Chemical reactions

1 answer 59 views

What is the solubility of Calcium chloride (CaCl2) in distilled water at room temperature?

answered Jan 21 in Inorganic Chemistry

1 answer 76 views

When was the theory of attachment styles developed?

asked Jan 20 in Psychology

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