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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


Unit 1 5 density

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).


Unit 1 5 density

Strategy

1. Get dimensions in common units.

2. Calculate volume in cubic centimeters.

3. Calculate the density.


Unit 1 5 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.