Recent activity by JoelPrentice

1 answer 34 views

What is the role of the photostability and photoreactivity of sunscreen agents in preventing skin damage caused by UV radiation?

answered Feb 24 in PhotoChemistry

1 answer 15 views

What is the pH of a 0.1 M solution of hydrochloric acid if the pH meter reading is 1.5?

answered Feb 22 in Analytical Chemistry

1 answer 39 views

What is the maximum amount of work that can be obtained from a chemical reaction at constant temperature and pressure, assuming perfect reversibility and no external work?

asked Feb 20 in Physical Chemistry

1 answer 31 views

What is the effect of temperature on the reaction sustainability of the decomposition of hydrogen peroxide catalyzed by potassium iodide?

asked Feb 20 in Chemical kinetics

1 answer 30 views

How does the coordination environment of metal ions affect the activity of metalloproteins and metalloenzymes? Provide examples of metalloproteins or metalloenzymes whose activity is modulated by changes in their coordination geometry.

asked Feb 19 in Coordination Chemistry

1 answer 34 views

How does the concentration of a surfactant affect the surface tension of water?

answered Feb 18 in Surface Chemistry

1 answer 32 views

How does the addition of dopant atoms affect the electronic properties of graphene? And how can these properties be harnessed for the development of more efficient electronic devices?

answered Feb 17 in Materials Chemistry

1 answer 46 views

Using retrosynthesis, propose a viable pathway for the synthesis of Ibuprofen from readily available starting materials.

answered Feb 13 in Organic Chemistry

1 answer 81 views

Calculate the standard enthalpy change for the liquid-to-gas phase transition of water at 100°C and atmospheric pressure, given that the enthalpy of vaporization of water is 40.7 kJ/mol.

asked Feb 3 in Chemical thermodynamics

1 answer 62 views

How does changing the pH affect the equilibrium position of a redox reaction involving a weak acid and its conjugate base? Provide a specific example to illustrate your answer.

asked Feb 3 in Chemical equilibrium

1 answer 137 views

How can a medicinal chemist develop a new treatment for cardiovascular diseases that targets the underlying causes of the disease, such as arterial stiffness and atherosclerosis, while also minimizing potential side effects on other physiological processes in the body?

answered Jan 30 in Medicinal Chemistry

1 answer 98 views

What is the composition and concentration of the components in a mixture of gasoline using gas chromatography?

answered Jan 30 in Analytical Chemistry

1 answer 149 views

How can X-ray diffraction be used to analyze the crystal structure of a sample and determine its chemical composition?

asked Jan 30 in Analytical Chemistry

1 answer 74 views

Calculate the enthalpy of formation for glucose (C6H12O6) at standard conditions, given the following enthalpies of formation for its constituent elements: C(graphite) = 0 kJ/mol H2(g) = 0 kJ/mol O2(g) = 0 kJ/mol Hint: Use Hess's Law and standard enthalpies of formation to solve the problem.

answered Jan 23 in ThermoChemistry

1 answer 80 views

Calculate the corrosion potential of copper in seawater environment having a pH of 8.2 and a temperature of 25°C given that the standard hydrogen electrode potential is -0.76 V and the concentration of copper ions in seawater is 2.5 x 10^-5 M.

asked Jan 23 in ElectroChemistry

1 answer 73 views

Calculate the change in entropy for the reaction: 2H2(g) + O2(g) → 2H2O(g)if the standard entropy values of H2, O2, and H2O are 130.7 J/mol*K, 205.0 J/mol*K, and 188.7 J/mol*K, respectively.

asked Jan 23 in Inorganic Chemistry

1 answer 90 views

A chemistry student wants to synthesize 29.0 g of NaCl from its constituent elements. What mass of sodium and chlorine should the student start with, assuming they have unlimited access to both elements and using the balanced chemical equation for the formation of NaCl from its constituent elements?

answered Jan 22 in Inorganic Chemistry

1 answer 78 views

A chemistry student wants to design an electrochemical cell that produces a voltage of at least 1.5 volts. The available electrodes are copper and aluminum. Using Faraday's law, calculate the mass of copper needed to produce the required voltage if aluminum is used as the other electrode. The specific gravity of copper is 8.96 g/cm³, and the standard reduction potential of copper and aluminum are -0.34 V and -1.66 V, respectively.

asked Jan 22 in Physical Chemistry

1 answer 68 views

A bottle contains a mixture of nitrogen and oxygen gases. At a specific temperature and pressure, the nitrogen molecules move on an average velocity of 500 m/s and oxygen molecules move at 400 m/s. What is the partial pressure of nitrogen and oxygen in the mixture if the total pressure of the gas is 1 atm?

asked Jan 22 in Physical Chemistry

1 answer 80 views

A certain polymerization reaction has a ΔH°rxn of -250 kJ/mol. If you need to make 500 grams of the polymer, how much energy in kilojoules will be released or absorbed during the reaction?

asked Jan 22 in ThermoChemistry

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