Hot questions

0 votes

1 answer 103 views

How can we design a system using chemical principles to efficiently recover valuable metals such as gold, silver, and platinum from electronic waste without causing harm to the environment?

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

0 votes

1 answer 107 views

What is the specific surface area of a sample of activated carbon if it adsorbs 0.45 g of nitrogen gas at 77 K and a pressure of 1 atm, assuming a monolayer of adsorbate and that the nitrogen gas occupies a volume of 22.4 L/mol?

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

0 votes

1 answer 113 views

What is the change in enthalpy for the following reaction at room temperature: 2H2(g) + O2(g) -> 2H2O(l) given the bond dissociation energies: H-H: 436 kJ/mol O=O: 498 kJ/mol H-O: 463 kJ/mol

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

0 votes

1 answer 108 views

What is the molar mass of Ba(NO3)2?

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

0 votes

1 answer 106 views

Sure. What is the standard enthalpy change for the reaction of mixing 10g of ethyl alcohol (C2H5OH) with 25g of water (H2O) at 25°C, given that the heat evolved is 12.5 kJ?

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

0 votes

1 answer 122 views

How does the use of different exchange-correlation functionals in density functional theory calculations affect the calculated reaction energies and mechanisms for the catalytic oxidation of methane on transition metal surfaces?

asked Feb 28 in Computational Chemistry by TheScientist (138k points)

0 votes

1 answer 108 views

What is the maximum work that can be obtained in a non-equilibrium process with a system at a given temperature and pressure, if the entropy change of the system is known? Calculate the answer assuming ideal gas behavior.

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

0 votes

1 answer 104 views

How does the concentration and acidity of rainwater in your local area compare to the average levels reported in areas affected by acid rain, and what are the potential impacts on the environment?

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

0 votes

1 answer 104 views

What is the yield of p-nitroaniline obtained when 10 grams of aniline is reacted with a 10 mL of 70% nitric acid solution for 1 hour?

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

0 votes

1 answer 109 views

What is the Gibbs free energy change for the electrochemical reaction:Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)given that the standard reduction potentials are E°(Cu2+|Cu) = +0.34 V and E°(Zn2+|Zn) = -0.76 V, and the reaction is carried out at 25°C?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

0 votes

1 answer 118 views

What are the chemical compounds present in polluted water that cause harmful effects on aquatic life, and how can we effectively remove or minimize their presence in order to restore and maintain the health of the aquatic ecosystem?

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

0 votes

1 answer 116 views

What processing techniques can be used to manufacture polymer packaging products with enhanced mechanical properties and barrier properties against water vapor, oxygen, and other gases?

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

0 votes

1 answer 107 views

What is the pH of a 0.1 M HCl solution?

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

0 votes

1 answer 106 views

What is the standard enthalpy change for the dissolution of 5.00 g of potassium chloride (KCl) in water, given that the molar heat of solution for KCl is -17.95 kJ/mol?

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

0 votes

1 answer 107 views

What is the pH of a 0.01 M solution of hydrochloric acid at 25°C, as determined using a pH meter with a precision of ± 0.02 pH units?

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

0 votes

1 answer 117 views

What are the factors that affect the phosphorescent properties of materials used in organic light-emitting devices (OLEDs)?

asked Mar 1 in PhotoChemistry by TheScientist (138k points)

0 votes

1 answer 114 views

What will be the effect on the equilibrium position of the redox reaction between Fe2+ and MnO4- if the concentration of Fe2+ is tripled, keeping the concentration of MnO4- constant?

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

0 votes

1 answer 106 views

What is the standard enthalpy change for the reaction of methane gas and oxygen gas to form carbon dioxide gas and water vapor, given that all gases are at standard temperature and pressure conditions?

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

0 votes

1 answer 107 views

What is the percent yield of a chemical reaction if you start with 50 grams of reactant A, but only produce 35 grams of product B, when the balanced equation indicates that you should produce 40 grams of product B?

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

0 votes

1 answer 103 views

How can we create a smart material using polymers that can detect toxins in water and turn a visibly different color to indicate contamination?

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

Categories