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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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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?
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4) Solution 15.0 g / 5.55 cm 3 = 2.70 g / cm 3 aluminum
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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?
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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
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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?
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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)
![ 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)](http://images.slideplayer.com./35/10339365/slides/slide_8.jpg " 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)")
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