Density A Physical Property of Matter. What is Density? Density is the amount of mass in a given volume. Density is the amount of mass in a given volume.

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Presentation transcript:

Density A Physical Property of Matter

What is Density? Density is the amount of mass in a given volume. Density is the amount of mass in a given volume. It is a physical property of matter used to help identify a substance. Each substance has its own density. It is a physical property of matter used to help identify a substance. Each substance has its own density. Ex: water has a density of 1 g/mL Ex: water has a density of 1 g/mL

Different Densities How can you tell if substances have different densities? How can you tell if substances have different densities? If a substance sinks in water, it has a density greater than that of water (greater than 1 g/mL). If a substance sinks in water, it has a density greater than that of water (greater than 1 g/mL). If a substance floats in water, it has a density less than that of water (less then 1 g/mL). If a substance floats in water, it has a density less than that of water (less then 1 g/mL).

Different Densities Which has a higher density, the vinegar or the oil? Which has a higher density, the vinegar or the oil? Oil Water Vinegar

Calculating Density How do you calculate density? How do you calculate density? MassVolume Mass divided by Volume

Sample Problem If the mass of a cylinder is 10g, and the volume of the cylinder is 2mL, what is the density of the cylinder? If the mass of a cylinder is 10g, and the volume of the cylinder is 2mL, what is the density of the cylinder? m=10g m=10g V=2mL 10g/2mL=5g/mL V=2mL 10g/2mL=5g/mL

Densities of Irregular Objects How do you calculate the density of an irregularly shaped object? How do you calculate the density of an irregularly shaped object? Find the mass by putting the object on a balance. Find the mass by putting the object on a balance. Find the volume by water displacement Find the volume by water displacement (note water level in graduated cylinder, put object in graduated cylinder, the volume the water level rises is the volume of the object.) (note water level in graduated cylinder, put object in graduated cylinder, the volume the water level rises is the volume of the object.)

Densities of Irregular Objects To find the mass: To find the volume: