An unknown metal bar has the following dimensions: 3.51cm x 3.00cm x 1.50 cm and weighs 179 g. Identify the unknown metal bar from the following list: iron, copper, zinc, aluminum, or lead. I don‘t know where to begin.
1) calculate the vol (3.51 cm x 3.00 cm x 1.50 cm)?vol 2) calcule the density of the metal density mass/vol. 179 g/ ?vol 3) once you have determined the density of unknown metal, compare it to the know density of the metals listed.
The first thing you should do in this problem would be to find the volume of the metal bar: Volume 3.51cm x 3.00cm x 1.50 cm 15.80 cm^3 (rounded to proper significant figures) Next, use the volume and the given mass to find the density: Density mass/volume 179 g/15.80 cm^3 11.33 g/cm^3 Now look at the periodic table and locate which density is closest to 11.33 g/cm^3. Lead (Pb) has a density of 11.40 g/cm^3, which is pretty close to 11.33g/cm^3. So, the unknown metal bar is lead.
