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?

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

Select the most likely product for this reaction: koh(aq) + co2(g) – ? k2co3(aq) + h2o(1) k(s) + h2(g) + o2(g) k(s) + co3(9) +h2