7.2 Density.

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Presentation transcript:

7.2 Density

Mass and Volume All matter has two things in common: mass and volume. Mass: quantity of matter in an object or sample Units: kilogram (k), gram (g), milligram (mg) Volume: amount of space that a material takes up Units: solid – cubic metres (m3); gas or liquid – litres (L), millilitres (mL) mass: quantity of matter in an object or sample volume: amount of space a substance takes up A digital balance showing the mass of a grape.

Density: A Physical Property Related to Mass and Volume Density: quantity of mass in a certain volume of material Units: solid – grams per cubic centimetre (g/cm3); liquids and gases – grams per millilitre (g/mL) Figure 2.6: The grape and foam have the same mass but different volumes. Which substance has the greater density? Explain why. density: quantity of mass in a certain volume of material

Determining Density To determine density, measure the mass and volume and then calculate using this equation:

Determining Density Example: If a sample of jet fuel has a mass of 8.30 g and a volume of 10.3 mL, what is its density? The density of water is about 1 g/mL. Therefore the density of jet fuel is less than the density of water (it will float on top of water).

Determining Density Figure 2.7 These liquids have different densities. (Dyes were added to the liquids to help you see the layers.) List the liquids in the order of most dense to least dense.