# Density - PowerPoint PPT Presentation

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Density. p. 20. FLOAT OR SINK???. Mass Density = ------------ Volume. Density of water = 1 g/ml If an object is less dense it will float. If an object is more dense than it will sink. Density. Density: ratio of mass to volume

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Density

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## Density

p. 20

### FLOAT OR SINK???

Mass

Density = ------------

Volume

Density of water = 1 g/ml

If an object is less dense it will float.

If an object is more dense than it will sink

### Density

• Density: ratio of mass to volume

• characteristic property that depends on the composition of a substance

• doesNOTdepend on the size of the sample

• It is an INTENSIVE PROPERTY

• Density Column

• When several immiscible (does not mix) liquids are combined, they form layers or a DENSITY COLUMN

• The liquids will order themselves according to their densities

• smaller density  TOP

• larger density  BOTTOM

### Learning Check!

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)

K

W

V

V

K

W

W

V

K

### Equation

Density = Mass___

Volume

M

D

V

• density =

• mass =

• volume =

Mass

volume

Density x volume

M

Mass

density

D

V

### Example #1

• What is the density of a material that has a mass of 15 g and a volume of 3 mL?

D= m

V

M

m= 15 grams

V= 3 mL

D = 5 g/mL

V

D

### Example #2

• What is the mass of an object if its density is 2 g/mL and its volume is 5mL?

m = Dx V

M

D= 2 g/mL

V= 5 mL

= 2 g/mLx 5mL

D

V

= 10 g

### Example #3

• What is the volume of a liquid with a density of 2.0 g/mL and a mass of 8 g?

V = m

D

M

D=2.0g/mL

m= 8g

= __8g__

2.0 g/mL

D

V

= 4 mL

## How do I measure the volume of a solid object???

### Find the Volume of the Cube

• V = l x w x h

• V = 2 cm x 2cm x 2cm

• V= 8 cm3

• If the Mass of the cube is 4 g… what is the density?

• D = .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!

What is the density (g/mL) of 48 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/ mL 2) 6 g/mL3) 252 g/mL

33 mL

25 mL

### Lab!

• Today you will determine the density of water by taking mass measurements of 5 different volumes of water.

• Measure the mass of the graduated cylinder first!

• Measure PRECISELY! 

• GRAPH: Volume on X-axis & Mass on Y-axis

• Theoretical Value of the density of water is 1g/mL.Use this for post lab question #4 to see how close you got!

### Exit Ticket

• Which object has the LEAST Density? WHY?

1)Water2)Granite3)Air

Mass= 8.0gMass=30.gMass=0.3g

Volume=8.0mLVolume= 9.0mLVolume=400mL