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?