Hot questions

0 votes

1 answer 30 views

What is the pH of a 0.1 M solution of acetic acid (CH3COOH) at 25°C?

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

0 votes

1 answer 30 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 31 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 31 views

What is the heat released or absorbed when 2 moles of hydrogen gas reacts with 1 mole of oxygen gas to form 2 moles of water vapor at constant volume? The enthalpy change for this reaction is -483.7 kJ/mol.

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

0 votes

1 answer 34 views

What is the enthalpy change for the reaction of burning 1 mole of methane gas (CH4) at standard conditions (25°C and 1 atm)?

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

0 votes

1 answer 40 views

What are the factors that affect the rate of corrosion on a metal surface and how can passivation be used to prevent it? Provide an example of a metal that is commonly passivated to protect it from corrosion.

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

0 votes

1 answer 44 views

How does the use of nitrogen fertilizers in sustainable agriculture practices impact the environment and what are some ways to minimize this impact?

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

0 votes

1 answer 36 views

What is the amount of heat released when 2.5 moles of propane (C3H8) is completely burned in oxygen gas (O2) according to the balanced equation: C3H8 + 5O2 → 3CO2 + 4H2O given that the standard enthalpy of combustion of propane is -2220 kJ/mol?

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

0 votes

1 answer 38 views

How can we reduce greenhouse gas emissions from transportation sources, such as cars and airplanes, through the use of alternative fuels and technologies in order to mitigate the impact of global warming?

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

0 votes

1 answer 29 views

What is the standard enthalpy change for the combustion of methane (CH4) to produce carbon dioxide (CO2) and water (H2O) if the reactants and products are at standard conditions (298 K and 1 atm)?

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

0 votes

1 answer 39 views

What are the misconceptions that students commonly hold about chemical bonding and molecular structure, and how do they affect their ability to understand and predict chemical reactions?

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

0 votes

1 answer 32 views

What is the formal charge of the nitrogen atom in the ammonium ion (NH4+)? Show your calculations and explain how you arrived at your answer.

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

0 votes

1 answer 31 views

What is the heat of neutralization when 25 mL of 1.0 M hydrochloric acid (HCl) is added to 25 mL of 1.0 M sodium hydroxide (NaOH) solution? The temperature change of the resulting solution was recorded as 5.0°C.

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

0 votes

1 answer 34 views

How can we calculate the energy states and optical properties of a semiconductor quantum dot with a 6 nm diameter and a spherical shape using quantum chemistry methods?

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

0 votes

1 answer 33 views

What is the enthalpy change of the dissolution of 5.00 g of sodium chloride in 100.0 mL of water at 25°C, given that the final temperature of the solution is 28.6°C and the heat capacity of the solution is 4.18 J/g°C?

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

0 votes

1 answer 27 views

What is the theoretical yield of aspirin that can be obtained from the synthesis of 5 grams of salicylic acid using 10 mL of acetic anhydride assuming a 100% yield and purity?

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

0 votes

1 answer 30 views

What is the molar mass of Calcium Carbonate (CaCO₃)? Show your calculations.

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

0 votes

1 answer 34 views

What is the efficiency of an electrochemical cell with a standard potential of +0.80V and a current of 2.5A, when the cell potential drops to +0.60V as a result of an internal resistance of 1.2Ω?

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

0 votes

1 answer 44 views

How does the use of different monomers affect the adhesive properties of polymers on different surfaces?

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

0 votes

1 answer 36 views

What is the activation energy of the reaction between hydrochloric acid and zinc, given that the reaction rate constant at 25°C is 3.42 x 10^-3 s^-1 and the temperature coefficient is 1.99?

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

Categories