Why are all of the substances on the periodic table classified as elements? substances on the periodic table cannot be broken down into other substances and are therefore elements. substances on the periodic table can be combined to form compounds and are therefore elements. substances on the periodic table cannot be dissolved in water or other liquids. all elements are pure substances. - which subatomic particle has a negative charge? electron proton neutron all particles

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.)