4. A solution of hydrofluoric acid (0.27 M, 10.00 mL) was titrated with 15.0 mL of 0.13 M sodium hydroxide (Ka of hydrofluoric acid = 7.20 x 104). What is the resulting pH of this solution? а. 3.33 b. 3.56 c. 4.57 d. 10.44 11.27 е.

The following arrows are incorrectly drawn and I drawn them correctly please check if it's right and write a little explanation how it's right

What are A, B, and C in the following table, and explain each of them briefly? E₁ A: MA hv=E₂ - E₁ M B: E₁ M M M hv=E₂-E₁ C: E, E₁

CONCLUSIONS: In general, the boiling points of compounds increase down a group in the periodic table. The melting points and boiling points for the hydrogen compounds of group 6A elements are in the table below. Melting Point (°C) Boiling Point (°C) H₂O 0.0 100.0 H₂S -82.0 -60.0 H₂Se -65.7 -41.2 H₂Te -49.0 -2.2 Use your understanding of chemistry to propose an explanation for the anomaly in the trend for the hydrogen compounds of group 6A elements shown in the table.

11. 1) Zn(Hg), HCI Ph 2) NBS, UV light (1 equivalent) OCH,CH3 12. 1) Br2, Fe 2) H2O, H3O*

9:16 PM Tue Mar 28 ← Curved arrows are used to illustrate the flow of electrons. Using the provided starting and product structures, draw the curved electron-pushing arrows for the following reaction or mechanistic steps. Be sure to account for all bond-breaking and bond-making steps. سلامت 1 H Select to Add Arrows HCI, CH3CH2OH HH HH Select to Add Arrows. Problem 81 of 20 Please select a drawing or reagent from the question area 29% Submit