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.

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.

The semi-conductors on the periodic table are classified as

Suppose you discovered a new element with 120 protons and 2 electrons in its outer level . i'm what group does this new element belong? what properties would you expect it to have