Hot questions

0 votes

1 answer 40 views

How does changing the pH of a solution affect the equilibrium position of a weak acid-base reaction? Provide an example to support your answer.

asked Feb 3 in Chemical equilibrium by CatherineLan (370 points)

0 votes

1 answer 39 views

How does changing the size of a quantum dot affect its electronic and optical properties, and how can this information be applied to the design of novel nano-scale electronic devices?

asked Feb 3 in Quantum Chemistry by CliffMcMaste (390 points)

0 votes

1 answer 29 views

Calculate the standard enthalpy change for the formation of one mole of methane (CH4) gas given the following information: - Heat of combustion of methane gas is -890.36 kJ/mol - Heat of formation of water (H2O) liquid is -285.83 kJ/mol - Heat of formation of carbon dioxide (CO2) gas is -393.52 kJ/mol

asked Feb 3 in Chemical thermodynamics by AurelioVos81 (330 points)

0 votes

1 answer 39 views

What is the effect of changing the size and shape of quantum dots and quantum wells on their electronic and optical properties, and how can these changes be calculated using quantum chemistry methods?

asked Feb 3 in Quantum Chemistry by PetraFonteno (270 points)

0 votes

1 answer 29 views

Calculate the standard enthalpy change for the formation of carbon dioxide (CO2) from its elements carbon (C) and oxygen (O2) given the following information:- The standard enthalpy change for the combustion of carbon to form carbon dioxide is -394 kJ/mol.- The standard enthalpy change for the combustion of hydrogen gas (H2) to form water (H2O) is -286 kJ/mol.- The standard enthalpy change for the reaction of oxygen gas (O2) with hydrogen gas (H2) to form water (H2O) is -572 kJ/mol.Note: All values are at standard temperature and pressure (298 K and 1 atm).

asked Feb 3 in Chemical thermodynamics by BrendanDimon (430 points)

0 votes

1 answer 26 views

Calculate the standard enthalpy change of the reaction between 100.0 mL of 0.100 M HCl(aq) and 100.0 mL of 0.100 M NaOH(aq) at 25°C, given that the specific heat capacity of the final solution is 4.18 J/g·°C and that the density of the final solution is 1.00 g/mL.

asked Feb 3 in Chemical thermodynamics by Louie80C6010 (390 points)

0 votes

1 answer 25 views

Calculate the standard free energy change for the following redox reaction at 25°C:2Fe(s) + 3/2 O2(g) -> Fe2O3(s)Given the following half-reactions and their standard reduction potentials at 25°C:Fe2O3(s) + 3H2O(l) + 2e- -> 2Fe(OH)3(s) E°= -0.33VO2(g) + 4H+(aq) + 4e- -> 2H2O(l) E°= +1.23VFe(OH)3(s) -> Fe3+(aq) + 3OH-(aq) E°= -0.25V

asked Feb 3 in Chemical thermodynamics by MarianneOFly (590 points)

0 votes

1 answer 35 views

Calculate the polarization in an electrochemical cell consisting of a zinc electrode and a copper electrode. The electrode potentials of zinc and copper are -0.76 V and +0.34 V, respectively. The resistance of the electrolyte solution between the electrodes is 10 ohms, and the current flowing through the cell is 0.5 A.

asked Feb 3 in ElectroChemistry by MargeneT1167 (410 points)

0 votes

1 answer 39 views

How does changing the reaction conditions, such as temperature and pressure, affect the properties of the final product in the production of polymers?

asked Feb 3 in Chemical engineering by NoemiSchirme (390 points)

0 votes

1 answer 35 views

Calculate the pH of a 0.1 M solution of hydrochloric acid assuming complete dissociation. The acid dissociation constant (Ka) for HCl is 1.3 × 10^-6 at 25°C.

asked Feb 3 in Chemical reactions by EdwinCamidge (410 points)

0 votes

1 answer 42 views

How does changing the concentration of one reactant affect the reaction rate and reaction order in a chemical reaction with multiple reactants?

asked Feb 3 in Chemical kinetics by LaurindaPape (310 points)

0 votes

1 answer 26 views

Calculate the standard enthalpy change for the vaporization reaction of 25.0 g of water at its boiling point of 100°C using the following information: the molar heat of vaporization of water is 40.7 kJ/mol and the molar mass of water is 18.015 g/mol.

asked Feb 3 in Chemical thermodynamics by AlmaFpj1336 (410 points)

0 votes

1 answer 25 views

Calculate the standard enthalpy of precipitation for the reaction: AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq) given that the standard enthalpies of formation for AgNO3(aq), NaCl(aq), AgCl(s), and NaNO3(aq) are -123.2 kJ/mol, -407.3 kJ/mol, -127.0 kJ/mol, and -467.3 kJ/mol, respectively.

asked Feb 3 in ThermoChemistry by LucienneOwf (330 points)

0 votes

1 answer 28 views

Calculate the standard enthalpy change for the neutralization reaction between 50.0 mL of 0.100 M hydrochloric acid and 75.0 mL of 0.080 M sodium hydroxide. Given: the specific heat capacity of the solution is 4.18 J/g°C and the density of the solution is 1.00 g/mL. The balanced chemical equation for the reaction is HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l).

asked Feb 3 in Chemical thermodynamics by ClaritaCress (670 points)

0 votes

1 answer 29 views

Calculate the standard enthalpy change for the dissolution of 5.36 g of NaOH in 100.0 mL of water, given that the molar enthalpy of dissolution for NaOH is -44.5 kJ/mol.

asked Feb 3 in Chemical thermodynamics by KieraBendrod (470 points)

0 votes

1 answer 27 views

Calculate the standard enthalpy change for the reaction in which 50 mL of 1.0 M HCl(aq) is added to 50 mL of 1.0 M NaOH(aq) at 25°C, given that the solution's specific heat capacity is 4.18 J g⁻¹ K⁻¹ and the density is 1.00 g/mL.

asked Feb 3 in Chemical thermodynamics by CharissaHanl (510 points)

0 votes

1 answer 32 views

Calculate the standard electrode potential for the reaction: Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) Given that the standard electrode potentials for the half-reactions are: Zn2+(aq) + 2e- → Zn(s) Etheta = -0.76 V Cu2+(aq) + 2e- → Cu(s) Etheta = 0.34 V

asked Feb 3 in ElectroChemistry by ChelseaMedra (410 points)

0 votes

1 answer 32 views

Calculate the standard electrode potential for the oxidation of Fe2+ ions to Fe3+ ions using the half-reactions and their respective standard electrode potentials. Show the balanced chemical equation for the overall reaction and determine if the reaction is spontaneous or non-spontaneous at standard conditions.

asked Feb 3 in Chemical thermodynamics by EpifaniaMcva (620 points)

0 votes

1 answer 32 views

Calculate the standard electrode potential for the following redox reaction: Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)Given that the standard electrode potential for the Zn²⁺/Zn electrode is -0.76V and for the Cu²⁺/Cu electrode is +0.34V.

asked Feb 3 in ElectroChemistry by JeffryRiw073 (330 points)

0 votes

1 answer 28 views

Calculate the standard enthalpy change for the melting of 10 grams of ice at -10°C to liquid water at 20°C, given the specific heat capacity of water is 4.18 J/g°C and the enthalpy of fusion of water is 6.01 kJ/mol.

asked Feb 3 in Chemical thermodynamics by MargretOlmst (450 points)

Categories