Recent activity by BarbraVidal

1 answer 33 views

What is the most effective protecting group for amino groups in organic synthesis and why? Provide examples of its use in peptide synthesis.

answered Feb 21 in Organic Chemistry

1 answer 32 views

What factors affect the conductivity of semiconductors and how can they be optimized for use in electronic devices?

asked Feb 19 in Materials Chemistry

1 answer 25 views

How does the concentration of reactants affect the reaction rate of the hydrolysis of sucrose and how does this impact the sustainability of the reaction?

answered Feb 19 in Chemical kinetics

1 answer 43 views

What is the color of a compound formed between magnesium and chlorine? Provide an explanation for your answer based on the electronic structure of magnesium and chlorine.

asked Feb 18 in Inorganic Chemistry

1 answer 57 views

How can we use quantum chemistry to calculate magnetic susceptibility values for a given molecule or material and how can that information be used to predict the magnetic behavior of the substance in different conditions?

asked Feb 14 in Quantum Chemistry

1 answer 93 views

What is the thermodynamic reaction pathway and the corresponding reaction mechanism for the electron transfer process taking place in a redox reaction between potassium permanganate and oxalic acid in acidic medium?

answered Feb 13 in Quantum Chemistry

1 answer 75 views

How can the properties of polymer-based electronic materials be optimized for use in flexible electronic devices?

answered Feb 10 in Polymer Chemistry

1 answer 43 views

How can the medicinal chemistry approach be used to identify and develop new small molecule inhibitors that selectively target autoimmune diseases, such as rheumatoid arthritis and lupus, while minimizing off-target effects and toxicity?

asked Feb 10 in Medicinal Chemistry

1 answer 36 views

How can complex chemical concepts be simplified and better understood for students struggling to grasp them?

answered Feb 5 in Chemical education

1 answer 68 views

Calculate the standard enthalpy change for the phase transition reaction from solid to liquid for a sample of substance X, given that the mass of the sample is 10 grams and the melting point of substance X is 50°C. The specific heat capacity of substance X is 2 J/g°C and the enthalpy of fusion for substance X is 50 J/g.

asked Feb 3 in Chemical thermodynamics

1 answer 77 views

Calculate the standard enthalpy change for the combustion of methane (CH4) at constant pressure, given that the standard enthalpies of formation are -74.87 kJ/mol for methane and -393.51 kJ/mol for carbon dioxide (CO2), and 2H2(g) + O2(g) → 2H2O(l) has a standard enthalpy change of -571.66 kJ/mol.

answered Feb 3 in Chemical thermodynamics

1 answer 171 views

How does the pH level affect the concentration of heavy metals in water affected by acid mine drainage, and what chemical processes occur to cause this impact on water quality?

asked Jan 30 in Environmental Chemistry

1 answer 99 views

What is the effect of a 10°C temperature increase on the rate of reaction between hydrochloric acid (HCl) and magnesium (Mg)?

asked Jan 30 in Chemical kinetics

1 answer 69 views

Calculate the equilibrium constant at 25°C for the reaction: CO(g) + 3H2(g) ⇌ CH4(g) + H2O(g) If at equilibrium, the concentration of CO is 0.10 M, H2 is 0.20 M, CH4 is 0.015 M and H2O is 0.035 M.

answered Jan 23 in Chemical equilibrium

1 answer 72 views

Calculate the enthalpy change in kJ/mol for the combustion of butane (C4H10) given that the heat of formation of CO2(g) is -393.5 kJ/mol, the heat of formation of H2O(l) is -285.8 kJ/mol, and the heat of formation of C4H10(g) is -126 kJ/mol. The balanced equation for the combustion of butane is:2C4H10(g) + 13O2(g) → 8CO2(g) + 10H2O(l) + heat.

answered Jan 23 in ThermoChemistry

1 answer 63 views

Determine the oxidation state of the transition metal in potassium manganate (VII) and explain how you arrived at your answer.

asked Jan 21 in Inorganic Chemistry

1 answer 112 views

What is the balanced chemical equation for the oxidation of ethanol (C2H5OH) to acetic acid (CH3COOH) using potassium dichromate (K2Cr2O7) as the oxidizing agent in acidic medium?

answered Jan 21 in Organic Chemistry

1 answer 153 views

Identify the number of stereoisomers for the compound 2,3-dichlorobutane, and draw their structures including R/S configurations for each chiral center present in the compound.

answered Jan 21 in Organic Chemistry

1 answer 66 views

Why are older adults more vulnerable to false memories?

asked Jan 20 in Psychology

1 answer 43 views

What is the role of the unconscious in psychodynamic therapy?

answered Jan 20 in Psychology

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