UNIT ONE
Density D = mass = g or g volume mL cm3 Note: 1 mL = 1 cm3
Learning Check D1 Osmium is a very dense metal. What is its a volume of 2.22cm3? 1) 2.25 g/cm3 2) 22.5 g/cm3 3) 111 g/cm3
Solution D1 2) Placing the mass and volume of the osmium metal into the density setup, we obtain D = mass = 50.00 g = volume 2.22 cm3 = 22.522522 g/cm3 = 22.5 g/cm3
Volume Displacement A solid displaces a matching volume of water when the solid is placed in water. 33 mL 25 mL
Learning Check D2 What is the density (g/cm3) of 42 g of a metal if the metal raises the level of water in a graduated cylinder from 25 mL to 33 mL? 1) 0.2 g/ cm3 2) 6 g/m3 3) 5 g/cm3 33 mL 25 mL
Solution D2 2. 5 g/cm3 = 33 mL - 25 mL = 8 mL Volume of metal (cm3) = 8 mL x 1 cm3 = 8 cm3 1 mL Density of metal = mass = 42 g = 5 g/cm3 volume 8 cm3
Learning Check D3 Which diagram represents the liquid layers in the cylinder? (K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL) 1) 2) 3)
Solution D3 (K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL) 1)
Density as Conversion Factors A substance has a density of 3.8 g/mL. Density = 3.8 g/mL Equality 3.8 g = 1 mL Conversion factors. 3.8 g and 1 mL 1 mL 3.8 g
Mass Volume kg L g mL (cm3) mg
Learning Check D4 1) 0.614 kg 2) 614 kg 3) 1.25 kg
Solution D4 1) 0.614 kg Unit plan: mL g kg Equalities: 1 mL = 0.702 g and 1 kg = 1000 g Setup: 875 mL x 0.702 g x 1 kg = 0.614 kg 1 mL 1000 g density metric
Learning Check D5 If blood has a density of 1.05 g/mL, how many liters of blood are donated if 575 g of blood are given? 1) 0.548 L 2) 1.25 L 3) 1.83 L
Solution D5 1) Unit Plan: g mL L 575 g x 1 mL x 1 L = 0.548 L 1.05 g 1000 mL
Learning Check D6 A group of students collected 125 empty aluminum cans to take to the recycling center. If 21 cans make 1.0 pound of aluminum, how many liters of aluminum (D=2.70 g/cm3) are obtained from the cans? 1) 1.0 L 2) 2.0 L 3) 4.0 L
Solution D6 1) 1.0 L 125 cans x 1.0 lb x 454 g x 1 cm3 21 cans 1 lb 2.70 g x 1 mL x 1 L = 1.0 L 1 cm3 1000 mL
Learning Check D7 You have 3 metal samples. Which one will displace the greatest volume of water? 1 2 3 Discuss your choice with another student.
Solution D7 1) 25 g Al x 1 mL = 9.2 mL 2.70 g
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