Hot questions

0 votes

1 answer 67 views

What is the pH of a 0.1 M hydrochloric acid solution at 25°C, determined using a calibrated pH meter with a sensitivity of 0.01 pH units?

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

0 votes

1 answer 68 views

What is the heat released or absorbed when 50 g of water freezes to ice at -10°C, given that the heat of crystallization for water is 6.01 kJ/mol?

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

0 votes

1 answer 75 views

How many resonance structures can be drawn for the nitrate ion (NO3-) and what are their respective bond lengths and partial charges on the atoms involved?

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

0 votes

1 answer 67 views

What is the pH of a 0.05 M solution of hydrochloric acid (HCl)?

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

0 votes

1 answer 72 views

What is the corrosion current density of a silver electrode in a 0.5M aqueous solution of NaCl at 25°C, given its polarization resistance of 125 Ω and an area of 20 cm²?

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

0 votes

1 answer 82 views

How has the understanding of the atom evolved throughout the history of chemistry, and how has this impacted the development of modern atomic theory?

asked Feb 28 in Chemical education by TheScientist (138k points)

0 votes

1 answer 64 views

What is the theoretical yield of 2,4-dinitrophenylhydrazine that can be obtained from the reaction between 0.25 grams of hydrazine and 0.45 grams of 2,4-dinitrochlorobenzene, assuming a 100% conversion efficiency and complete reaction?

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

0 votes

1 answer 71 views

What is the enthalpy change for the isomerization of butene-1 to butene-2 at standard conditions, given the enthalpies of formation of butene-1, butene-2, and hydrogen gas?

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

0 votes

1 answer 73 views

What would be the amount of heat energy required to change 100 grams of ice at -10°C into liquid water at 20°C? Given, the enthalpy of fusion of ice = 6.01 kJ/mol and the specific heat capacity of liquid water = 4.18 J/g°C.

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

0 votes

1 answer 70 views

What is the enthalpy change when 50.0 grams of ammonium chloride (NH4Cl) is dissolved in 250.0 mL of water at 25°C? The molar enthalpy of dissolution of NH4Cl is -14.8 kJ/mol.

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

0 votes

1 answer 80 views

What is the vibrational frequency and the infrared spectrum of carbon monoxide (CO) molecule using quantum chemistry calculations, and how do these properties relate to the molecule's geometry and electronic structure?

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

0 votes

1 answer 73 views

What is the amount of heat absorbed by 25 g of ice at -10°C when it is converted to water at 20°C? Given the enthalpy of fusion of ice is 6.01 kJ/mol and the specific heat capacity of water is 4.18 J/g°C.

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

0 votes

1 answer 79 views

What is the mechanism of the Williamson ether synthesis reaction, and how does changing the reaction conditions affect the yield and selectivity of the desired ether product?

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

0 votes

1 answer 65 views

What is the standard enthalpy change for the vaporization of 50 grams of liquid water at 100°C and 1 atm pressure? Given that the molar enthalpy of vaporization of water is 40.6 kJ/mol.

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

0 votes

1 answer 75 views

How can we increase the exposure of chemistry in our everyday lives to promote learning and interest in the subject among students?

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

0 votes

1 answer 69 views

What is the formal charge of the nitrogen atom in the molecule HNO3?

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

0 votes

1 answer 72 views

What is the change in entropy when 2 moles of hydrogen gas react with 1 mole of oxygen gas to form 2 moles of water vapor at 298 K and 1 atm pressure?

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

0 votes

1 answer 77 views

What factors affect the absorption, distribution, metabolism, and excretion of drugs in the human body and how can medicinal chemists optimize a drug's pharmacokinetic properties to improve therapeutic efficacy?

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

0 votes

1 answer 79 views

How does the wavelength of light affect the efficiency of photosensitizers in photochemical reactions?

asked Feb 28 in PhotoChemistry by TheScientist (138k points)

0 votes

1 answer 75 views

How can the use of renewable energy sources such as solar, wind, and hydroelectric power be improved to minimize their impact on the environment and ensure their sustainability for future generations?

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

Categories