How many grams of dry NH4Cl need to be added to 2. 00 L of a 0. 100 mol Lâ’1 solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8. 56? Kb for ammonia is 1. 8Ă—10â’5.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.