Unit 1 5 density
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Unit 1-5 Density. physical and chemical properties. Matter has both physical and chemical properties. Physical properties: are the characteristics of a substance that do not involve changing to another substance.

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Physical and chemical properties
physical and chemical properties

  • Matter has both physical and chemical properties.

    Physical properties:

  • are the characteristics of a substance that do not involve changing to another substance.

  • they are physical characteristics that can be observed or measured without changing the identity of a substance

  • Examples are: melting point, boiling point, shape, size, color, conductivity, solubility, hardness


2 types of physical properties
2 types of physical properties

  • Extensive- depends on the amount of matter

  • Ex: volume, mass, amount of energy, ….

  • Intensive- does not depend on the amount

  • Ex: color, odor, density, boiling point, ability to conduct ….


Density an important and useful physical property

Platinum

Mercury

Aluminum

DENSITY - an important and useful physical property

13.6 g/cm3

21.5 g/cm3

2.7 g/cm3


Problem A piece of copper has a mass of 57.54 g. It is 9.36 cm long, 7.23 cm wide, and 0.95 mm thick. Calculate density (g/cm3).


Strategy

1. Get dimensions in common units.

2. Calculate volume in cubic centimeters.

3. Calculate the density.


SOLUTION

1. Get dimensions in common units.

2. Calculate volume in cubic centimeters.

3. Calculate the density.

(9.36 cm)(7.23 cm)(0.095 cm) = 6.4 cm3

Note only 2 significant figures in the answer!


Learning check
Learning Check

Osmium is a very dense metal. What is its

density in g/cm3 if 50.00 g of the metal occupies

a volume of 2.22cm3?

1) 2.25 g/cm3

2) 22.5 g/cm3

3) 111 g/cm3


Solution
Solution

Placing the mass and volume of the osmium metal into the density setup, we obtain

D = mass = 50.00 g =

volume 2.22 cm3

= 22.522522 g/cm3 = 22.5 g/cm3


How about the object with an irregular shape
How about the object with an irregular shape?

Archimedes of Syracuse and the crown


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/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


Learning check2
Learning Check

The density of octane, a component of gasoline, is 0.702 g/mL. What is the mass, in kg, of 875 mL of octane?

1) 0.614 kg

2) 614 kg

3) 1.25 kg


Float or not float
Float or not float?

  • At normal temperature, the density of water is close to 1 g/mL.

  • principle of buoyancy :

    • If density of object> 1 g/ml, sink in water

    • If density of object< 1 g/ml, float in water

    • What about density of object= 1 g/ml?

  • Can you swim?


Learning check3
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


Learning check4
Learning Check

If blood has a density of 1.05 g/mL, how many liters of blood are donated if 575 g of blood are given?

1) 0.548 L

2) 1.25 L

3) 1.83 L


Learning check5
Learning Check

A group of students collected 125 empty aluminum cans to take to the recycling center. If 21 cans make 1.0 pound of aluminum, how many liters of aluminum (D=2.70 g/cm3) are obtained from the cans?

1) 1.0 L 2) 2.0 L 3) 4.0 L


Homework
Homework

  • Page 40 question 61-66

  • Due tomorrow.


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