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 / 9 Act B19 Creating New Materials CH Q How are reactants changed by a chemical reaction? How are the products different? VOCAB: next slide

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

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

PROCEDURE AND DATA MATERIALS: PROCEDURE: Read on pg. B-40-41 and summarize DATA: WS 19.1 Comparing Properties of Polymers

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 !

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

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