A student has samples of five different types of metal. She measures the mass and volume of each sample. The measurements she took are in the table. Mass Type of Metal Volume (cm3) aluminum 14.6 5.4 iron 33.1 4.2 lead 35.2 3.1 6.1 10.6 magnesium 4.5 47.2 silver The student also has another piece of metal. She knows it is the same type of metal as one of her other samples, but she doesn't know which one it is. She finds that its mass is 33.5 grams and its volume is 3.2 centimeters. What type of metal is the unknown sample?

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.)