Density

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Density - PowerPoint PPT Presentation

Density. Which is heavier- One pound of lead or one pound feathers?. Density. The formula for density is: mass volume Common units are g/mL, or g/cm 3 , (or g/L for gas) Note: 1 mL = 1 cm 3. Density =. Density. Mass (g). Volume (cm 3 ).

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PowerPoint Slideshow about 'Density' - tevin

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Presentation Transcript
Density
• Which is heavier-

One pound of lead or one pound feathers?

Density
• The formula for density is:

mass

volume

• Common units are g/mL, or g/cm3, (or g/L for gas)

Note: 1 mL = 1 cm3

Density =

Density

Mass (g)

Volume (cm3)

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

Density
• An object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its mass.

M = 11,200 g

Density
• A liquid has a density of 0.87 g/mL. What volume is occupied by 25 g of the liquid?

V = 29 mL

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/cm3) 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/ cm3 2) 6 g/m3 3) 252 g/cm3

33 mL

25 mL

Solution

2) 6 g/cm3

Volume (mL) of water displaced

= 33 mL - 25 mL = 8 mL

Volume of metal (cm3)

= 8 mL x 1 cm3 = 8 cm3

1 mL

Density of metal =

mass = 48 g = 6 g/cm3

volume 8 cm3

Learning Check

You have 3 metal samples. Which one will displace the greatest volume of water?

1 2 3

Discuss your choice with another student.

25 g Al

2.70 g/mL

45 g of gold

19.3 g/mL

11.3 g/mL

Solution

1) 25 g Al x 1 mL = 9.2 mL 2.70 g

25 g Al

2.70 g/mL

density
• What happens when corn oil and water are mixed?
• Why?
• Will lead float in water?
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

W

K

W

V

K

Solution

(K) Karo syrup (1.4 g/mL), (V) vegetable oil (0.91 g/mL,) (W) water (1.0 g/mL)

1)

V

W

K

Density and Temperature
• What happens to density as the temperature increases?
• Mass remains the same
• Most substances increase in volume as temperature increases
• Thus, density generally decreases as the temperature increases
Density and water
• Water is an important exception
• Over certain temperatures, the volume of water decreases as the temperature increases
• Does ice float in liquid water?
• Why?
• See Figure 1-3, page 6