1. Unit: Properties of Matter
Chap 15 &16

2. What is Physical Science?
Study of Chemistry and Physics
Not a life Science Class

3. What is Matter? Any thing that has mass and takes up space
Therefore has mass & Volume
Is air Matter???

4. How do we describe Matter?
Describe its properties – Characteristics
Physical Properties
any property that is measurable and its value describes a physical system's state.
can be observed or measured without changing the composition of matter.

5. Chemical Properties
describes its "potential" to undergo some chemical change or reaction by virtue of its composition.
Describe the capacity of a substance to undergo a change that will alter the composition of the substance

6. Physical Properties: Mass – amount of matter in an object
Is a property of a substance
Is not dependent on the location of object
Is not affected by gravity
Unit: Kg or grams
Triple Beam Balance

7. Weight: Is a Force Unit: lbs. (english), but Newtons (N)  SI units
Is affected by gravity, because is the force of gravity acting on a mass
Dependent on location and gravitational force acting there
Spring Scale

8. FYI
1 stone = 14 pounds

9. Does a person’s weight change with altitude?

10. What is gravity?
is a natural phenomenon by which physical bodies attract each other with a force proportional to their masses.
In 1687, English mathematician Sir Isaac Newton published Principia, which hypothesizes the inverse-square law of universal gravitation.

11. What does the size of Gravity depend on?
Mass of 2 objects
Distance between their Centers (called center of gravity)

13. How is weight defined?

14. Converting B/w Mass and Weight
Weight = Mass X g
W = m g Kg
Newtons (N)
g = 9.8 m/s2

15. variation of acceleration due to gravity on earth
Where would you weigh the most?

16. gravitational accelerations

17. Problem An object as a mass of 25 kg. What is it weight in Newton’s?
W = mg
W = 25 kg X 9.8 m/s2
W = 245 N

18. Problem If an object has a weight of 1500 N, what is its mass? W = mg
1500N = m X 9.8 m/s2
m = kg

19. Find the mass of an object that has a weight of 950 N.
W= m g
950N = 950 kgm/s2
96.94 kg

20. Converting using pounds (lbs) for units
Use Dimensional Analysis using Conversion Factors
1 lb = 4.45 N
1 kg = 2.2 lbs
If a guy weighs 195 lbs, what is his weight in Newtons? N

21. Mass/Weight Conversions
A gold bar has a mass of 4 kg. What is its weight in pounds?
8.8 lbs.
An box weighs 25 lbs. What is the mass of the box?
11.36 kg or 1136 grams

22. What is the mass of 1 ton of asphalt?
1 ton or 1000 kg
What is the Weight of 1 ton of asphalt in pounds?
2200 lbs.

23. Volume: The amount of space an object occupies
To determine the volume of a substance:
Regular Shaped objects:
V = Length X Width X Height

24. For an irregularly shaped object:
Use Water displacement

25. Read volume Before adding object
Water Displacement:
Read volume Before adding object
Add object
Read volume after adding object
Volume of Object = difference b/w reading #2 and #1.
meniscus

26. Volume
Units: Liters, ml
1 ml = 1 cm3

27. Density Mass of a substance per unit of Volume
it describes the degree of compactness of a substance
How much mass is packed into an amount of space

28. Ratio of mass to volume
D = mass
Volume
units: g/ml or g/cm3
***Remember 1 cm3 = 1 ml

29. Density
Under constant conditions, density remains the same for a substance
Since different substances have different densities, density measurements can be used in identifying substances
Ex. Density of gold is 19.3 g/ml
Density of Water 1 g/ml

30. Allows for a comparison of different substances (with even different amounts) by putting them on equal ground.

32. Density will change if substances changes state or phase of matter
Solid – Liquid - Gas

34. How does Temperature Effects Density.
Usually the Higher the temperature the Lower the Density.

35. Water???

37. Density Problems
What is the density of an object that has a mass of 600 grams and a volume of 350 cm3?
1.71 g/ cm3
Find the volume of gold that has a mass of 450 grams if the density of gold is 19.3 g/ml.
23.3 ml

38. Chemical Properties:
Describe the capacity of a substance to undergo a change that will alter the composition of the substance
Ex. Combustible, Flammable, Able to Rust, Reacts with light, etc.