C. fluorescence.
Because it refers to the release of light.
Veins are the correct answer. Sills are a slab of stone, Joints are artificially made, and Dikes are ditches or walls to prevent flooding.
Answer:
3.77 x 10^-11
Explanation:
So the equilibrium would be (0.725 - 0.00000523) ≈ 0.7249
Ka = [H+] x [CH3COO^-] / [CH3COOH]
Ka = [5.23 x 10^-11] x [5.23 x 10^-11] / 0.7249
Ka = 3.77 x 10^-11
Hope this helped : )