 1) Density = mass/volume  2) units = g / mL or g / cm 3  3) physical property = can be measured without changing the chemical composition.

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Presentation transcript:

 1) Density = mass/volume  2) units = g / mL or g / cm 3  3) physical property = can be measured without changing the chemical composition

 4) A 15.0 g sample of metal has a volume of 5.55 cm 3. What is the density of the metal? What is the metal?

 4) Solution  15.0 g / 5.55 cm 3 = 2.70 g / cm 3  aluminum

 5) A metal block measures 1.3 cm on all three sides. Its mass is 15.7 g. What is the density and identity of the metal?

 5) Solution  Volume = 1.3 cm x 1.3 cm x 1.3 cm = 2.2 cm 3  D = 15.7 g / 2.2 cm 3 = 7.1 g / cm 3  Metal = zinc

 6) A graduated cylinder is filler with 50.0 mL of water. An unknown metal with a mass of 12.2 g is added. The final volume is 51.7 ml. Find the density. What is the unknown metal?

 6) Solution ◦ Volume = 1.71 mL [51.7 ml – 50.0 ml] ◦ Mass = 12.2 ◦ Density = M/V ◦ Density of zinc = 7.14 g / cm 3 (ml)