Iron pyrite is often called “fool’s gold” because it looks like gold. Suppose you have a solid that looks like gold, but you believe it to be fool’s gold. The sample has a mass of 23.5 g. When the sample is lowered into the water in a graduated cylinder (Study Question 63), the water level rises from 47.5 mL to 52.2 mL. Is the sample fool’s gold (d = 5.00 g/cm3) or “real” gold (d = 19.3 g/cm³)?

Data given in Question 63

A sample of unknown metal is placed in a graduated cylinder containing water. The mass of the sample is 37.5 g, and the water levels before and after adding the sample to the cylinder are as shown in the figure. Which metal in the following list is most likely the sample? (d is the density of the metal.)

(a). Mg, d = 1.74 g/cm³

(b). Fe, d = 7.87 g/cm³

(c). Ag, d = 10.5 g/cm³

(d). Al, d = 2.70 g/cm³

(e). Cu, d = 8.96 g/cm³

(f). Pb, d = 11.3 g/cm³

Transcribed Image Text:

25 20 15 10 5 25 20 15 10 5 Graduated cylinders with unknown metal (right)