Do Now
What is brass?What element(s) is it made from?What is it used for?
Objectives
1. SWBAT define allotropes and explain why there are different types.
2. SWBAT try to solve a problem in which three very different substances are made from the same element.
3. SWBAT define alloys and apply them to their coin design.
4. SWBAT finish their lab from before break.
2D Materials: Designing for Desired Properties
Materials: Designing for Desired Properties
Depletion of Earth’s chemical resourcesMotivators to consider alternatives
ScarcityCost Environmental factorsEconomic factorsPolitical factors
Materials: Designing for Desired Properties
One alternative might be to find, modify, or create new materials that could substitute for the resource
Requirements for an ideal substitutePlentiful InexpensiveHas useful properties that match or exceed
those of the original resource
2D.1 Structure and Properties: Allotropes
ChemQuandry, p. 184 – A Case of Elusive Identity
2D.1 Structure and Properties: Allotropes
2D.1 Structure and Properties: Allotropes
Different forms of Carbon
a) diamond b) graphite d)
buckminsterfullerine (buckeyball)
2D.1 Structure and Properties: Allotropes
Allotropes are different forms of the same element that each have distinctly different chemical or physical properties
Must be in same stateCaused by different structures – how
atoms are linked and organized
2D.1 Structure and Properties: Allotropes
Video Clip: Structure and Properties: Allotropes
http://www.whfreeman.com/ChemCom/
2.D.6 Allows and Semiconductors
Alloy:Solid combination of atoms from two or
more metalsEX. Brass (copper and zinc)
http://www.whfreeman.com/ChemCom/
Do Now
List 3 motivators to start a search for alternative chemical resources.
List 3 allotropes of carbon.
Objectives
1. SWBAT define ceramics and ceramics engineering
2. SWBAT list properties of ceramics3. SWBAT finish the Convering copper
lab4. SWBAT work in small groups to
research metals, create a model, and create a presentation on their coin.
TONIGHT’S HOMEWORK
1. Wear or bring long pants2. Wear or bring close toed shoes3. Bring 3 pennies to class
IF YOU ARE NOT DRESSED APPROPRIATELY, YOU WILL NOT PARTICIPATE IN LAB.
2D.3 Engineered Materials
CeramicsClay – one of the most plentiful
substances on EarthMade of Al2O32SiO2 2H2O (kaolinitem
a mineral) & Mg+2, Na1+, K+1
Clay + Water Mixture to mold & heat into pottery & bricks
2D.3 Engineered Materials
2D.3 Engineered Materials
Ceramics – Useful Properties - DurabilityHardnessRigidityLow chemical reactivityResistance to wear
Medical applications (e.g., hip replacements)
2D.3 Engineered Materials
Engineered Ceramics Produced by newly developed
techniques & materials Useful Properties
High melting points Strength at high temperatures
2D.3 Engineered Materials
Applications Substitutes for steel (e.g., high-
temperaturediesel or turbine engines – high efficiency –reduce fuel costs
Computer circuit board resistors – less brittle
Quiz on 2.D.
AllotropesAlloysRequirements for substitute materialsRequirements for needing substitutesCeramics (Engineering)Striking it Rich (Lab 2.D.)
Quiz on:
Read Pages 187-190, 193-197
Complete worksheet for homework.