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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: depend on the amount of matter that is present. Volume Mass Energy Content (Think Calories)
Intensive properties: (Characteristic Properties): do NOT depend on the amount of matter present. Melting Point Boiling Point Density
Different Physical Properties of MatterHelium Sulfur 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=52UAEQfMTtU
Physical Properties table
1. What substance(s) is a gas at 0 °C?
2. What substance(s) is a solid at 100°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