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.

MATTER &

CHANGE:PHYSICAL PROPERTI

ES

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

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 - H2O

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?