Recent activity by SusannahCrow

1 answer 13 views

How does the size and shape of metal nanoparticles affect their catalytic activity in the production of hydrogen gas from water?

asked 1 day ago in Materials Chemistry

1 answer 6 views

How does the size and shape of a molecule affect its ability to transport charge or energy in the nanoscale system?

asked 1 day ago in Quantum Chemistry

1 answer 28 views

What is the effect of different wavelengths of light on the rate of a reaction between hydrogen peroxide and potassium iodide solution, and how does this relate to the activation energy of the reaction?

asked 3 days ago in Chemical kinetics

1 answer 21 views

What is the stepwise reaction mechanism involved in the preparation of 2,4-dichlorobenzoic acid from benzoic acid and chlorine gas, and at which step does the chlorination reaction occur?

answered 3 days ago in Chemical synthesis

1 answer 16 views

What is the oxidation product of an aldehyde and a ketone, and how can it be identified using a specific chemical test?

answered 4 days ago in Organic Chemistry

1 answer 7 views

How does the coordination chemistry of metalloenzymes and metalloproteins affect their functionality and specificity towards certain substrates?

asked 6 days ago in Coordination Chemistry

1 answer 34 views

What is the predicted color of a transition metal ion in an octahedral coordination complex with four ligands of the same type and two ligands of a different type?

asked Feb 18 in Inorganic Chemistry

1 answer 30 views

What is the effect of the chemical structure of a dye or pigment on its photochemical properties? Use specific examples to support your answer.

answered Feb 18 in PhotoChemistry

1 answer 25 views

What is the bond strength of the CO double bond compared to the NN triple bond, and explain the reasoning behind your answer based on the concepts of bond length and bond dissociation energy?

answered Feb 18 in Chemical bonding

1 answer 22 views

What is the bond angle of water molecule (H2O) according to the VSEPR theory and how does it affect the molecule's structure and properties?

asked Feb 18 in Chemical bonding

1 answer 10 views

How can we design a polymer-based drug delivery system that can effectively target cancer cells and release the drug at a controlled rate over a period of time?

answered Feb 12 in Polymer Chemistry

1 answer 32 views

How can the performance of polymer-based electronic materials be optimized through the control of molecular weight and branching?

answered Feb 10 in Polymer Chemistry

1 answer 37 views

How can the addition of nanoparticles enhance the mechanical properties of polymer nanocomposites and what role does the size, shape, and concentration of nanoparticles play in this improvement?

asked Feb 6 in Polymer Chemistry

1 answer 56 views

Here is a chemistry problem related to renewable energy sources and their impact on the environment:What is the net energy yield and the carbon footprint of producing ethanol fuel from corn stover waste (a byproduct of corn cultivation) using a biochemical conversion process, and how does it compare to producing gasoline from crude oil in terms of environmental impact?

asked Feb 4 in Environmental Chemistry

1 answer 38 views

Calculate the standard enthalpy change for the reaction: CuSO4 (aq) + 4NH3 (aq) -> Cu(NH3)4SO4 (aq) given that the standard enthalpy changes of formation for CuSO4 (aq) and NH3 (aq) are -771.5 kJ/mol and -46.19 kJ/mol respectively, and the standard enthalpy change of formation for Cu(NH3)4SO4 (aq) is -2130.4 kJ/mol.

answered Feb 3 in Chemical thermodynamics

1 answer 49 views

Calculate the standard enthalpy change for the reaction: CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g) Given the necessary bond enthalpies are: C-H = 411 kJ/molO=O = 495 kJ/molO-H = 463 kJ/molC=O = 799 kJ/mol.

answered Feb 3 in Quantum Chemistry

1 answer 46 views

Calculate the standard enthalpy change for the formation of methane gas (CH4) from its elements carbon (solid, graphite) and hydrogen gas (H2) given the following data:ΔHf° (C(graphite)) = 0 kJ/molΔHf° (H2(g)) = 0 kJ/molΔHc° (CH4(g)) = -890.4 kJ/mol

answered Feb 3 in Chemical thermodynamics

1 answer 49 views

Calculate the standard enthalpy change (ΔH°) for the reaction of combustion of 1 mole of ethanol (C2H5OH) given that the standard enthalpy of formation (ΔH°f) for ethanol and carbon dioxide (CO2) are -277.7 kJ/mol and -393.5 kJ/mol respectively, and the standard enthalpy of formation (ΔH°f) for water (H2O) is -285.8 kJ/mol. The balanced chemical equation for the reaction is as follows:C2H5OH (l) + 3 O2 (g) → 2 CO2 (g) + 3 H2O (l)

asked Feb 3 in Chemical thermodynamics

1 answer 76 views

What type of bond is formed between a hydrogen atom and a chlorine atom?

asked Jan 30 in Chemical bonding

1 answer 61 views

Calculate the enthalpy change for the reaction: 2H2 (g) + O2 (g) → 2H2O (l) given that the standard enthalpy of formation for water is -285.8 kJ/mol, and standard enthalpies of formation of H2 (g) and O2 (g) are 0 kJ/mol.

answered Jan 23 in Chemical thermodynamics

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