1/12 - 8th Grade Agenda Learning Objective: Learn about Polymers

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Presentation transcript:

1/12 - 8th Grade Agenda Learning Objective: Learn about Polymers Collect HW: Reading & Notetaking: p.143 – 144 Video: None of the Above Textbook Reading p. 306 - 312 HW: Reading & Notetaking p.146 – 147 Reminder: Last day to turn in late work in 1/13 Reminder HW: Science Fair Background due 1/13 & 1/14 (10 Points)

Daily Reflection Prompt: Although both Diamond and Pencil graphite are made of carbon, why is Diamond harder than Pencil graphite?

Diamonds are the hardest substance on Earth. What is it made out of? Carbon Diamonds are formed deep within the earth At very high temperature and pressure, carbon atoms from diamond crystals.

Diamonds and Pencil Leads are both made out of pure carbon Question: Why is a diamond much harder than pencil lead? Answer: Difference in the arrangement of molecules

Carbon has 4 valence electrons Because Carbon has 4 valence electrons, it is possible for carbon atoms to from chains and rings

What kind of Pure Carbon is this? Fullerene are carbon atoms arranged in shape of a holl______sphere (Discovered 1985) In a Nanotube, carbon atoms are arranged in the shape of a long, hollow cylinder (Discovered in 1991). Nanotubes are tiny, light, flexible and extremely stro_______ ow ng

What is made of carbon compounds? Cotton Shirt Shampoo Propane Meat Vegetable Paper

Which elements does hydrocarbon contain? Hydrocarbon is a compound that contains only elements hydrogen and carbon. Hydrocarbons are flammable

What is a Isomer? Compounds that have the same chemical formula but different structural formulas are called isomers Butanes and isobutane have different melting points and boiling points

Double Bond Single bond hydrocarbons end in “-ane” like Propane Double Bond hydrocarbons end in “-ene” or “-yne” like Ethene.

Hydroxyl Group Hydroxyl group is a “OH” compound used for substitute for hydrogen atom in hydrocarbons Alcohol is a substituted hydrocarbon that contains one or more hydroxyl group Ethanol is produced natually by yeast when they consure sugar stored in corn, wheat and barley Methanol (poisonous) Ethanol

Polymers vs. Monomers Polymer: A very large molecule (millions of atoms) made of a chain of many smaller molecules. Monomer: Smaller molecule – the links that make up the chain

What are some natural Polymers?

What are some examples of Natural Polymers? Wool Cotton Silk DNA & RNA Protein Carbohydrates Starch

What are some man made Polymers?

What do plastics and cells in your body have in common? They are both made of carbon compounds

What are the four types of polymers found in all living things? Carbohydrates Lipids Proteins Nucleic Acids ???????? ???????? ???????? ????????

Carbons can form four covalent bonds They can also bond to each other in changes and ring shaped groups

What are composites Composites combine two or more substances as a new material with different properties