2. Creating New Materials
LEARNING TARGET: I can investigate a chemical reaction and compare the properties of the product to the properties of the reactants.
Nov 8 / Act B19
Creating New Materials
CH Q
How are reactants changed by a chemical reaction?
How are the products different?
VOCAB:
next slide

3. product (of chemical reaction)
new chemical made
chemical reaction
cross-link
Monomer
polymer
reactant
product (of chemical reaction)
bond
one plastic “unit”
many plastic “units”
chemicals used in reaction
chemicals made in reaction

4. DISCUSSION
List Chemical Reactions:
Color change
Forming a new substance
Emission of gas
Emission or absorption of heat
Emission of light or sound
2. List examples of Chemical Reactions:
Burning fuel
Combustion of gas to power a car
Baking bread
Human body reaction between food and oxygen to produce carbon dioxide (CO2) and water (H20), releasing energy

5. PROCEDURE AND DATA
MATERIALS:
PROCEDURE: Read on pg. B and summarize
DATA: WS Comparing Properties of Polymers

6. Each student make vinyl alcohol molecule… C2H4O
POST DISCUSSION
Each student make vinyl alcohol molecule… C2H4O
monomer = ‘one part’
make polyvinyl alcohol molecule… (link four together)
polymer = ‘many parts’
ALL PLASTICS ARE POLYMERS !

7. POST DISCUSSION:
1. The change in the physical properties indicates _______ .
A chemical reaction happened and
a new substance has been formed!
2. Which do you think is a harder substance, a polymer with more cross-links OR a polymer with fewer cross-links? What’s your evidence?
more cross-links = harder
evidence = more bonds
3. What do you think would happen to the final polymer if you continued to add sodium borate?
more cross-links
gel gets firmer

8. ANALYSIS
- Discuss and answer Q 2 & 3 on pg. B- 41
ANS CHALLENGE Q
How are reactants changed by a chemical reaction?
How are the products different? A:
new chemicals made (products)
different physical (and chemical) properties
HOMEWORK
1. Finish Analysis Qs