3. Chemical and Physical Properties of Materials
Oct 23 / Act B14
Chemical and Physical Properties of Materials
LEARNING TARGET: I can collect chemical/physical property data of different materials and determine the ‘best’ material for a given product.
CHALLENGE Q
How do the properties of materials determine their uses?
VOCAB:
chemical properties physical properties
reacts and new chemical made
5 physical senses

4. *show Obla-di song video – 3 mins
DISCUSSION
Review the difference between physical and chemical properties.
Physical – how it appears (looks) - Touchy feely; measurable; (5 senses); no chemical reaction
Chemical – only by adding another chemical to see if a reaction occurs – a new substance would occur
2. List examples of physical properties:
3. List an example of a chemical property:
see, hear, smell, touch, (taste) = physical senses
*show Obla-di song video – 3 mins
add chemical = reaction and new chemical made

5. Examples of physical properties:
Color – Does it resemble the color of something else?
Hardness – How resistant to scratching is it relative to another substance?
Luster – How is light reflected from the material? Shiny, dull, metallic, glassy, waxy, etc.
Light transmission – Does light pass through the material?
Texture – How does the material feel between the fingers?
Gritty, smooth, rough, etc.
Flexibility – Does the material bend with gentle pressure?
An example of a chemical property:
Reaction with hydrochloric acid – Does it react?

7. PROCEDURE AND DATA
MATERIALS:
PROCEDURE: Read on pg. B and summarize
DATA: WS Testing Physical and Chemical Properties
WS Selecting Materials for Products
WS Chem/Phys Prperties

8. softer
softer

9. POST DISSCUSSION: - How can we sort the materials?
ANALYSIS
- Discuss and answer none
ANS CH Q
How do the properties of materials determine their uses? A:
various answers depending on need
HOMEWORK
Complete WS 14.2 AND 14.3