Which of the following Ka values represents the weakest acid

A: Ka=1.82x10^-1

B: Ka=3.24x10^-7

C: Ka=1.29x10^-4

D: Ka=1.62x10^-12

What is the oxidation number of nitrogen (N) in the compound HNO3? A) + 1 B) + 5 C) + 6 D) + 7

How does atomic radius change from left to right across a period in the periodic table?

As electrons orbit the nucleus, according to bohr, they move in a. random directions. b. the same direction. c. opposite directions. d. an unpredictable pattern.

Elemental boron can be formed by reaction of boron trichloride with hydrogen. BCl3 (g) + 1.5H2 (g) - > B (s) + 3HCl (g) Substance: BCl3 (g) H2 (g) B (s) HCl (g) S° (J/K•mol) : ? 130.6 5.87 186.8 If? S° = 80.3 J/K, what is S° for BCl3 (g) ?

A student intended to make a salt solution with a concentration of 10.0grams of solute per liter of solution. When the student's solution wasanalyzed, it was found to contain 8.90 grams of solute per liter of solution.

How will increasing the pressure on the system affect this equilibrium reaction? 2H2 (g) + O2 (g) - > 2H2O (g)

What are small round structures in the cell that breaks down large food particles into smaller ones

A balloon has a volume of 2.5 L and contains 0.100 moles of Helium. Another balloon has a volume of 5.0 L. They are at the same temperature and pressure. How many moles of gas does the second balloon contain?

Why is it important to that the solid be dry before the final mass measurement?

What is 0.00055030 in Scientific form?