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 = g/ l  Melting point = C  Boiling Point = C  Gas at room temperature  Density =6.17 g/ L  Melting Point =-78C  Boiling Point = -64 C Gas at room temperature 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 atm?

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