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.