Hot questions

0 votes

1 answer 39 views

What is the amount of heat absorbed by a 50 g sample of water when it is heated from 20°C to 100°C? (Specific heat of water= 4.18 J/g·K)

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

0 votes

1 answer 33 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 36 views

What is the enthalpy change when 10 g of potassium chloride (KCl) is dissolved in 100 mL of water at 25°C? The molar enthalpy of solution of KCl is -17.6 kJ/mol.

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

0 votes

1 answer 46 views

What are the vibrational frequencies of a CO molecule and a CO2 molecule, and how can those frequencies be identified experimentally using vibrational spectroscopy techniques?

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

0 votes

1 answer 30 views

What is the theoretical yield of nylon-6,6 that can be produced from the reaction of 10 grams of adipic acid and 10 grams of hexamethylenediamine, assuming no side reactions occur and all reactants are completely consumed?

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

0 votes

1 answer 39 views

What is the amount of energy required to melt 50 grams of ice at 0°C, given that the heat of fusion of ice is 333.55 J/g?

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

0 votes

1 answer 32 views

What is the specific heat capacity (in J/g°C) of copper if 100 grams of the metal absorbs 1500 J of heat and its temperature increases by 20°C?

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

0 votes

1 answer 43 views

What are the factors affecting the photochemical properties of quantum dots and how can we optimize their performance for various applications in electronics, photonics, and biomedicine?

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

0 votes

1 answer 30 views

What is the theoretical yield of benzocaine that can be obtained from the reaction between 5 grams of p-aminobenzoic acid and 25 ml of ethanol, assuming a complete reaction and 100% yield?

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

0 votes

1 answer 37 views

What is the difference in energy between the ground state and first excited state of a H2 molecule using the time-dependent Schrödinger equation and what is the resulting wavelength of light absorbed or emitted during the transition?

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

0 votes

1 answer 42 views

What are the most effective and safe methods for disposing of radioactive waste that minimize impact on the environment and human health?

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

0 votes

1 answer 31 views

What is the standard enthalpy change for the reaction of calcium oxide (solid) and water to form calcium hydroxide (solid) if 3.2 grams of calcium oxide reacts with excess water under standard conditions?

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

0 votes

1 answer 43 views

What experimental factors affect the effectiveness of sunscreen agents in providing protection against UV radiation?

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

0 votes

1 answer 31 views

What is the standard enthalpy change for the reaction of zinc oxide and hydrochloric acid to form zinc chloride and water, given that all reactants and products are solids at standard temperature and pressure?

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

0 votes

1 answer 34 views

What is the heat of formation of methane (CH4) given the following bond energy values: C=C (838 kJ/mol), C-H (413 kJ/mol) and H-H (436 kJ/mol)?

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

0 votes

1 answer 37 views

What is the efficiency of an electrochemical cell with a standard potential of 1.5V when the measured potential is 1.2V and the current passing through the cell is 0.5A for 2 hours? (Assume the cell is operating under standard conditions.)

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

0 votes

1 answer 35 views

What would be the expected yield of nylon-6,6 if 5 grams of adipic acid were reacted with excess hexamethylenediamine in a 1:1 molar ratio reaction?

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

0 votes

1 answer 47 views

How can the use of different catalysts affect the yield and structure of carbon nanotubes synthesized through chemical vapor deposition?

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

0 votes

1 answer 38 views

What is the cathodic Tafel slope of a zinc electrode immersed in a solution of 0.1 M Zn2+ ions at 25°C, when the current density is 50 mA/cm²? The exchange current density for this reaction is known to be 1.2 x 10^-6 A/cm².

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

0 votes

1 answer 42 views

What are the main factors that contribute to the difficulty in understanding complex chemical concepts, and how can a chemistry student overcome those challenges in order to improve their understanding and performance in the subject?

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

Categories