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Density

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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

- 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

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

Density = Mass___

Volume

M

D

V

- density =
- mass =
- volume =

Mass

volume

Density x volume

M

Mass

density

D

V

- 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

- 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

- 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???

- 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

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

33 mL

25 mL

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

- 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!

- Which object has the LEAST Density? WHY?
1)Water2)Granite3)Air

Mass= 8.0gMass=30.gMass=0.3g

Volume=8.0mLVolume= 9.0mLVolume=400mL