Water Phase Diagram Effects of increasing the pressure (revisit ice skating example)

Phase vs. State of Matter States of Matter: Solid, liquid, gas, or plasma Phases of Matter: Two or more different forms of a substance that are in the same state

Both solid phases of Carbon Graphite Diamond Graphite vs Diamond Both solid phases of Carbon Graphite Diamond

Graphite Diamond Opaque Soft Electrical Conductor Thermal Insulator Relate structure to softness/hardness and how that helps its uses (graphite – pencils and diamonds being used as high power tools). Even though both are a form of carbon they have extremely different structure and function. Opaque Soft Electrical Conductor Thermal Insulator Transparent Hard Electrical Insulator Thermal Conductor

Are diamonds more than just jewelry? Play Video

How is diamond formed naturally? Have students copy these questions onto piece of paper to answer during video. List at least 3 properties of diamonds mentioned in the video. How are diamonds formed naturally? Why is methane used in Chemical Vapor Deposition? What two physical conditions are required to form man-made diamonds? Can you tell the difference between natural and man-made diamonds? Why might diamonds replace silicon in electronic devices?

Carbon Phase Diagram

What are some properties of diamond?

Why use Methane in Chemical Vapor Deposition (CVD)? Under what conditions? Why? (relate to breaking bonds in methane and the conditions diamonds form at/phase diagram)

Carbon Phase Diagram

Why might diamonds replace silicon in electronic devices?