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Net Ionic Equations

Q. Keeping solubility rules in mind, what is the complete ionic equation for Na2S2O3 in water? (be sure to include aqueous, solid, liquid, or gas)

Solved • Dec 9, 2019

Orbital Overlap

Q. Which bonds in this molecule are polar (list them), and how many of these bonds are pi bonds?

Solved • Dec 9, 2019

Titrations of Diprotic and Polyprotic Acids

Q. A student was given a 0.15 M solution of an unknown diprotic acid H2A and asked to determine the Ka1 and Ka2 values for the diprotic acid. The student titrated 44.4 mL of the 0.15 M H2A with 0.15 M KOH. After 22.2 mL of KOH was added, the pH of the resulting solution was 6.37. After 44.4 mL of KOH was added, the pH of the resulting solution was 8.34. What is the value of ka2 for the diprotic acid when ka1 is 4.2e-7?

Solved • Dec 7, 2019

Boiling Point Elevation

Q. Determine the boiling point of a solution that contains 78.8 g of naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722 mL of benzene (d = 0.877 g/mL). Pure benzene has a boiling point of 80.1°C and a boiling point depression constant of 2.53°C/m. A) 82.3°C B) 2.2°C C) 80.4°C D) 82.6°C E) 2.5°C

Solved • Jul 15, 2019

Molality

Q. What is the molality of ethanol in a solution made by dissolving 14.6 g of ethanol, C2H5OH, in 53.6 g of water? A) 0.272m B) 272m C) 0.00591m D) 5.91m

Solved • Jul 15, 2019

Balancing Chemical Equations

Q. Complete and balance the equation for the single-displacement reaction. Phases are optional. equation: Li + NaOH -> Li+NaOH⟶

Solved • Oct 22, 2019

Bond Energy

Q. Given the average bond energies below: Bond (average bond energy in kJ/mol): C≡C (839), C-C (348), H-I (299), C-I (240), C-H (413), What is the energy associated with breaking all of the bonds in the acetylene molecule? what is the energy associated with breaking all of the bonds in the hydrogen iodide molecules? Confused:**I know that breaking bonds has a positive sign, but the hydrogen iodine is on the products side which is usually negative.

Solved • Sep 16, 2019