Put the following three molecules in order of decreasing F-X-F bond angle, where X is the central atom. Support your ranking with Lewis structures of each molecule (use wedge/dash notation to show geometry). Label bond angles. (i) BF_3 (ii) XeF_4 (iii) RnF_2

Nonpoint source pollution is difficult to control because it

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

Most metamorphosis processes take place