Which one of the following procedures would result in a buffer with ph close to 9.0?
ka(ch3cooh) = 1.8 × 10-5
kb(nh3) = 1.8 × 10-5

mixing 1 mol ch3cooh and 1 mol nh3 in a 1.0 l aqueous solution.

mixing 1 mol ch3cooh and 1 mol naoh in a 1.0 l aqueous solution.

mixing 1 mol nh3 and 0.5 mol hcl in a 1.0 l aqueous solution.

mixing 1 mol ch3cooh and 0.5 mol naoh in a 1.0 l aqueous solution.

mixing 1 mol nh3 and 1 mol hcl in a 1.0 l aqueous solution.

Nitric oxide (no) can be formed from nitrogen, hydrogen and oxygen in two steps. in the first step, nitrogen and hydrogen react to form ammonia: n2(g) + 2 h_2(g) rightarrow 2 nh_3 (g) delta h = -92. kj in the second step, ammonia and oxygen react to form nitric oxide and water: 4 nh_3(g) + 5 o_2(g) rightarrow 4no(g) + 6 h_2o(g) delta h = -905. kj calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

Based on its chemical properties, identify the position of each chemical family on the periodic table.

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?