# Describing Matter  What you observe when you look at a particular sample of matter is its properties.  Properties used to describe matter can be classified.

## Presentation on theme: "Describing Matter  What you observe when you look at a particular sample of matter is its properties.  Properties used to describe matter can be classified."— Presentation transcript:

Describing Matter  What you observe when you look at a particular sample of matter is its properties.  Properties used to describe matter can be classified as extensive or intensive.

Properties of Matter  Extensive properties  Extensive properties: depend on the amount of matter that is present.  Volume  Mass  Energy Content (Think Calories)  Intensive properties  Intensive properties: (Characteristic Properties): do NOT depend on the amount of matter present.  Melting Point  Boiling Point  Density

Different Physical Properties of Matter HeliumSulfur hexafluoride  Density = 0.1786 g/ l  Melting point = -272.20 C  Boiling Point =- 268.93 C  Gas at room temperature  Density =6.17 g/ L  Melting Point =-78C  Boiling Point = -64 C Gas at room temperature http://www.youtube.com/watch?v=52UAEQfMTt U

V6 MythBusters Video  V6 MythBusters Video  V7 Sulfur Hexafluoride

Physical Properties table 1.What substance(s) is a gas at 0 °C? 2.What substance(s) is a solid at 100°C?

Physical Properties table What substances is a solid at -125 ° C?

Phase Diagram - gives conditions of temperature & pressure at which a substance exists as solid, liquid and gas.

Triple Point - all three phases exist in equilibrium Critical Point - temperature at which the liquid state ceases to exist Supercritical Fluid -

Triple Point of Water  0.016° C & 0.61 kPa  Liquid, vapor & solid are all in equilibrium  Vaporization  Condensation  Melting  Freezing  Sublimation  Deposition

Melting Point Boiling Point Phase Diagram - H 2 O

Why does dry ice sublime when we use it in the lab?

Phase Diagram for Carbon

Heating Curve

States of Matter

What is happening at point c?

When is a liquid turning into a gas?

Why does heat increase at point D but not temperature?

What phase is water at 90 degrees celsius and 0.004 atm?

If you are at 0.80 atm and you temperature changes from 60 C to 95 C what phase change has happened?

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