1. Physical and Chemical Properties
Chapter 8 Lesson 2

2. What are physical properties?
PHYSICAL PROPERTIES- something that can be observed about an object without changing the identity of the object
MASS- The amount of matter in an object
Measured in kilograms or grams
Use a balance to measure mass
WEIGHT- how strongly gravity pulls on an object
Measured in Newtons (N) or pounds (lbs)
Use a scale to measure weight
VOLUME- measures how much space matter takes up
Measured using Milliliters(mL) or Liters(L)
Use graduated cylinders to measure volume

3. What are physical properties (continued)
DENSITY- the amount of mass for each cm3 of a substance
An objects ability to sink or float
Objects that are denser will sink
Objects float as a result of buoyancy-resistance to sinking
The formula for finding density is mass/volume

4. Boiling Points & Freezing Points
The temperature at which a substance freezes is called its freezing point
This changes the substance from a liquid to solid
The freezing point of water is 0 degrees C
The temperature at which a substance boils is also a physical property
The boiling point is when a substance changes state from liquid to gas
The boiling point of water is 100 degrees C

5. Let’s Try One… Answer- Mass
Mass is measured in grams (g) or kilograms (kg)

6. You try…
Answer-C
We measure volume using a cylinder

7. You try…
Answer- A
You know that we use milliliters (mL) to measure volume. Texture is something that is felt (touch) so an object can feel smooth or rough.

8. Here’s another… Answer- A
The colder the temperature, the lower the degrees, therefore, to freeze a substance you will need the coldest temperature= 0

9. What are chemical properties
Describes the way a substance reacts with other substances
Flammability is a chemical property of a substance that describes its ability to catch on fire or burn
When some substances are burned they change color-this is also evidence of a chemical property
When left outside, some metals will corrode
CORROSION- is when metals combine with nonmetals from the environment=RUST

10. Chemical Properties Practice
Answer- A
Color is a chemical property because it can change (when the banana rots)

11. Let’s Try another…