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How many bones does the mammalian middle ear have?

asked Dec 30, 2024 in Science by Diana66S829 (1.6k points)

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According to the Cognitive Dissonance Theory, what happens when people hold inconsistent beliefs?

asked Jan 17 in Psychology by JaredOliva6 (2.2k points)

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What are the hybrid orbitals present in methane (CH4)?

asked Feb 13 in Chemical bonding by MatthewStore (1.3k points)

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According to the gestalt approach to problem-solving, why are insight problems difficult to solve?

asked Jan 17 in Psychology by ErnestineScr (1.6k points)

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Consider the metalloprotein hemoglobin, which has four heme groups each coordinated to a single iron ion. Suppose that ferrous iron in the heme group of hemoglobin is oxidized to ferric state by reacting with hydrogen peroxide. Calculate the number of hydrogen peroxide molecules needed to oxidize all the iron ions of hemoglobin in a human body that has a total of 5 liters of blood, assuming the concentration of hemoglobin in blood is 15 grams per liter.

asked Feb 3 in Coordination Chemistry by SylviaPettey (2.4k points)

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How can the synthesis of polypropylene from propylene monomer be optimized to increase the yield and molecular weight of the resulting polymer while minimizing the amount of impurities and defects in the product?

asked Feb 11 in Chemical synthesis by ElviaBumgarn (1.8k points)

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How does the co-administration of Drug A and Drug B affect the pharmacokinetics and pharmacodynamics of each drug, and what implications does this have for the therapeutic efficacy and safety of the drugs?

asked Mar 1 in Medicinal Chemistry by TheScientist (138k points)

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How to design a chemical reactor to produce 1000 liters of ammonia per hour using Haber-Bosch process with the given reactant feed rates and operating conditions?

asked Mar 1 in Chemical engineering by TheScientist (138k points)

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1 answer 63 views

What is the heat released or absorbed when 50 grams of methane ($CH_{4}$) is burnt completely in oxygen ($O_{2}$) at a constant pressure of 1 atm? The heat of combustion of methane is -890.4 kJ/mol.

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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How does a decrease in temperature affect the equilibrium constant (Kc) for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g)? Calculate the new equilibrium constant if the initial Kc for this reaction at 400°C is 4.34 x 10^-3 and the temperature decreases to 250°C.

asked Mar 1 in Chemical equilibrium by TheScientist (138k points)

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What is the enthalpy change (ΔH) for the combustion of methane gas (CH4) at constant pressure (1 atm) if 5.5 grams of methane is completely burned in a bomb calorimeter and the temperature increases by 14.6°C?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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How can we design self-assembled supramolecular structures with high stability and selectivity for targeted drug delivery applications?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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How can we utilize the knowledge of immunological pathways to design small molecules that selectively inhibit immune cells involved in autoimmune diseases, without affecting normal immune functions?

asked Mar 1 in Medicinal Chemistry by TheScientist (138k points)

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What is the vibrational frequency and corresponding infrared spectrum of ammonia (NH3) molecule at room temperature?

asked Mar 1 in Quantum Chemistry by TheScientist (138k points)

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How does the binding free energy of a specific protein-ligand complex change as the temperature of the system is increased from 298K to 310K, based on molecular dynamics simulations?

asked Mar 1 in Computational Chemistry by TheScientist (138k points)

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1 answer 50 views

How can we design a polymer-based drug delivery system that can effectively target and release a specific drug at a desired rate to a targeted site in the body, while also ensuring biocompatibility and minimizing potential side effects?

asked Mar 1 in Polymer Chemistry by TheScientist (138k points)

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How can we utilize polymer-based smart materials to create a self-healing and reusable plastic product that resists degradation and environmental impact?

asked Mar 1 in Polymer Chemistry by TheScientist (138k points)

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What is the change in enthalpy (ΔH) for the combustion of propane (C3H8) at standard conditions, given that the heat of formation (ΔHf) for propane is -103.85 kJ/mol, and the combustion reaction is:C3H8(g) + 5 O2(g) --> 3 CO2(g) + 4 H2O(l)

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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What is the standard enthalpy change for the reaction between 50 mL of 1 M sulfuric acid and 40 mL of 1.5 M sodium hydroxide at 25 °C, given that the temperature change observed was 6.5 °C?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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How can we design a polymer-based material with maximum optical transparency and refractive index matching to glass for use in optical lenses and other optical devices?

asked Mar 1 in Polymer Chemistry by TheScientist (138k points)

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