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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

Density

p. 20



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


Density1
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
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
Equation

Density = Mass___

Volume

M

D

V


Solve for each variable
Solve for each variable

  • density =

  • mass =

  • volume =

Mass

volume

Density x volume

M

Mass

density

D

V


Example 1
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
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
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



Find the volume of the cube
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
Volume Displacement

A solid displaces a matching volume of water when the solid is placed in water.

33 mL

25 mL


Learning check1
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
Exit Ticket

  • Which object has the LEAST Density? WHY?

    1) Water 2)Granite 3)Air

    Mass= 8.0g Mass=30.g Mass=0.3g

    Volume=8.0mL Volume= 9.0mL Volume=400mL


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