Recent activity by HeleneHoward

1 answer 21 views

What is the optimum temperature and pressure conditions required for the industrial synthesis of polyethylene from ethylene monomer, and how do these conditions affect the properties of the final polymer product?

asked 5 days ago in Chemical synthesis

1 answer 25 views

How do the electronic and magnetic properties of metal-organic frameworks affect their performance as catalysts for specific chemical reactions?

asked 5 days ago in Quantum Chemistry

1 answer 23 views

What is the effect of different photosensitizers on the rate of photochemical reactions?

asked 5 days ago in PhotoChemistry

1 answer 24 views

How does the coordination number and geometry of metallofullerenes and metalloclusters affect their electronic and magnetic properties?

asked 6 days ago in Coordination Chemistry

1 answer 20 views

What is the bond order of nitrogen molecule (N2) using molecular orbital theory?

answered Feb 18 in Chemical bonding

1 answer 22 views

What is the reason behind the acidity of carboxylic acids being more than phenols?

answered Feb 17 in Chemical bonding

1 answer 18 views

How can we predict the selectivity and activity of a catalyst in a chemical reaction using quantum chemistry calculations?

answered Feb 14 in Quantum Chemistry

1 answer 42 views

What is the mechanism of ligand substitution reactions in coordination chemistry and how does the substitution of a ligand affect the properties of a coordination complex? Provide examples to support your answer.

answered Feb 13 in Coordination Chemistry

1 answer 36 views

How can we improve the durability and corrosion resistance of outdoor steel structures using polymer-based coatings, and what specific types of polymers and additives are most effective for this application?

asked Feb 13 in Polymer Chemistry

1 answer 39 views

How can we enhance the compatibility of two incompatible polymers in a polymer blend to achieve improved mechanical properties?

asked Feb 13 in Polymer Chemistry

1 answer 4 views

How can we design drugs with high specificity towards a specific type of bacteria, while minimizing any potential harmful effects on the human body?

asked Feb 12 in Medicinal Chemistry

1 answer 27 views

How can the photochromic properties of a material be optimized for efficient use in photochromic lenses or in smart windows technology?

asked Feb 10 in PhotoChemistry

1 answer 50 views

Calculate the standard electrode potential (E°) for the reaction below at 298K using the standard reduction potentials given:2H⁺(aq) + 2e⁻ → H₂(g) E°= 0.00VFe³⁺(aq) + e⁻ → Fe²⁺(aq) E°=+0.77V 2H⁺(aq) + Fe³⁺(aq) → H₂(g) + Fe²⁺(aq)

asked Feb 3 in Chemical thermodynamics

1 answer 47 views

How can the presence of arsenic in a sample be identified using X-ray fluorescence spectroscopy, and what is the concentration of arsenic in the sample?

answered Jan 29 in Analytical Chemistry

1 answer 68 views

A chemistry student wants to mix 50 mL of water at 25°C with 50 mL of ethanol at 25°C to make a solution. The heat of mixing for water and ethanol is -21.2 kJ/mol. Calculate the heat (in kJ) absorbed or released when the two liquids are mixed. (Assume the densities of water and ethanol are approximately 1 g/mL and 0.8 g/mL, respectively.)

asked Jan 22 in ThermoChemistry

1 answer 89 views

What is the oxidation state of manganese in potassium permanganate (KMnO4)?

answered Jan 21 in Inorganic Chemistry

1 answer 48 views

What is the oxidation state of nitrogen in N2O5?

answered Jan 21 in Inorganic Chemistry

1 answer 58 views

What is the empathy cycle?

answered Jan 20 in Psychology

1 answer 55 views

According to the Broca's aphasia case study, what is the impact of this condition on language production?

asked Jan 20 in Psychology

1 answer 42 views

Where did the anxiety sensitivity theory come from?

answered Jan 20 in Psychology

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