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Daily Inquiry: Wednesday, Sept. 5

Daily Inquiry: Wednesday, Sept. 5 (a) A metal object has a mass of 8.4 g. The volume of the sample is 3.1 mL. Calculate the density of the object. (b) Given the chart of densities below, determine the composition of the object. Derived Units. 1. Volume – derived from length

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Daily Inquiry: Wednesday, Sept. 5

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  1. Daily Inquiry:Wednesday, Sept. 5 (a) A metal object has a mass of 8.4 g. The volume of the sample is 3.1 mL. Calculate the density of the object. (b) Given the chart of densities below, determine the composition of the object.

  2. Derived Units 1. Volume– derived from length • SI unit of volume is cubic meter (m3) • More convenient unit is cubic decimeter (dm 3) • Also referred to as a liter (L) 1 dm3 = 1 L • Another common unit of volume is a cubic centimeter (cm3 or cc) • The volume occupied by 1cm is the same as 1 milliliter (mL) 1 cm3 = 1 mL

  3. 2. Density – mass per unit volume of a substance. D = m/V • Density is an intensive physical property of a substance. • Materials that are more dense sink in things that are less dense. • Every substance has its own unique density at a particular temperature. • Density varies with temperature. Density usually decreases with increasing temperature.

  4. Densities of Common Materials

  5. Finding Density Using Water Displacement

  6. Other Density Problems Problem #1: Copper has a density of 8.92 g/cm3. What is the mass of a cube of copper that has a volume of 6.25 cm3? Problem #2: What is the volume of a sample of liquid mercury that has a mass of 76.2 g? Given that the density of mercury is 13.6 g/mL.

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