A radioactive sample decays to 5.75 g in 28 minutes. If the half-life is 7 minutes, how much was in the original sample?

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 .

Displacement is the slope of a velocity vs. time graph a. true b. false

When water dissolves sugar, which process is not involved? o dissociation o hydration o surface area of the solute increases sa