what is the oxidation number change for the chromium atom in the following unbalanced reduction half reaction? cr2o72-(aq) h (aq) → cr3 (aq) h2o(l)

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

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.)

Who examines and coordinates the cleanup of polluted sites?