1. Characteristic Physical Properties
Some examples of quantitative physical properties include:
Density
Freezing point
Melting point
Boiling point
These properties can be used to identify a pure substance.

2. DENSITY
density is the amount of matter per unit volume of that matter

3. DENSITY
To calculate the density of a substance, we need two pieces of information;
mass
measured in mg, g, kg using a scale or balance
volume
measured in mL, L using a graduated cylinder or cm3, m3 using a ruler

4. DENSITY
To calculate the density of a substance, use the following equation: m D V

5. Determining Mass
Triple Beam Balance

6. Reading a Triple Beam Balance

7. Reading a Triple Beam Balance

8. Reading a Triple Beam Balance

9. Measuring the Volume of a Rectangular Solid
Volume = length x width x height
V = l w h

10. Measuring the Volume of a Spherical Solid
 = 3.14

11. Measuring the Volume of a Cylinder
V =  r2 h
 = 3.14

12. Measuring the Volume of a Liquid
Graduated Cylinder

13. Reading a Graduated Cylinder

14. Reading a Graduated Cylinder

15. Reading a Graduated Cylinder

16. Reading a Graduated Cylinder
Example #1
Bottom of meniscus
6.6 mL

17. Reading a Graduated Cylinder
Example #2
53 mL
Bottom of meniscus

18. Measuring Volume of a Small Irregular Object
Displacement Method
Fill graduated cylinder partially with water
Read initial volume
Place in solid
Read final volume
Volume solid = Volume final – Volume initial

19. Measuring Volume of a Small Irregular Object by Displacement of Water in a Graduated Cylinder

20. Measuring Volume of a Large Irregular Object
Overflow Method
Fill overflow can until water starts to pour out
Place in solid
Collect the overflow water in a graduated cylinder
Volume solid = Volume overflow

21. Measuring Volume of a Large Irregular Object by Displacement of Water in an Overflow Cup

22. The GRASS Method for Problem Solving
Given
State what the question is giving you.
(Don’t forget the symbols and units)
m = 12 g
V = 15 mL
Required
What does the question ask you to find?
Use appropriate symbols.
D = ?
Analysis
Rearranged equation that you will use to answer the question.
D = m / V
Solve
Solve the problem.
Make sure to include the units.
Statement
Make a statement with the answer and units.
  the density of the liquid is g/mL.

23. Example 1:
A softball has a mass of 360 g and a volume of 270 cm3. Find its density.
Given:
Mass, m = 360 g
Volume, V = 270 cm3
Required:
Density,
D in g/cm3
Analysis:
Solution:
D = 360 g
270 cm3
D = 1.33 g/cm3
Statement:
the density of the softball is 1.33 g/ cm3

24. What is the identity of the metal?
Example 2:
Calculate the density of a metal sample that is cm long, 9.21 cm wide, and 4.45 cm high and that has a mass of kg.
What is the identity of the metal?
Given:
l = cm m = kg
w = 9.21 cm
h = 4.45 cm
Required:
V (cm3)
D (g/cm3)
Analysis:
V = lwh

25. What is the identity of the metal?
Example 2:
Calculate the density of a metal sample that is cm long, 9.21 cm wide, and 4.45 cm high and that has a mass of kg.
What is the identity of the metal?
Solution:
V = l w h
V = (18.00 cm)(9.21 cm)(4.45 cm)
D = kg
738 cm3
D = kg/cm3
V = 738 cm3
D = 19.3 g/cm3
Statement:
the density of the metal is 19.3 g/cm3
The metal is gold.

26. Homework: Density Problems Worksheet pg. 198 #1, 3-10
Test (Chapter 5) – Thursday Sept 18