States of Matter. 3 States of Matter Solids _____________________________________ Liquids ______________________________________ Gases ______________________________________.

States of Matter

3 States of Matter Solids

_____________________________________

Liquids ______________________________________

Gases ______________________________________

Most Dense

Least Dense

The 4th State of Matter What happens if you raise the temperature to super-

high levels…between 1000°C and 1,000,000,000°C?

PLASMA!!PLASMA!! A plasma is an ionized gas. A plasma is a very good conductor of electricity and is affected by

magnetic fields. Plasma, like gases have an indefinite shape and an indefinite volume.

Nature of Gases Minimal attractive forces between particles Particles have lots of energy and move freely

Kinetic Molecular Theory:= a model or theory used to describe the behavior of gases

1.) The particles in a gas are considered to be ___________________________________________________________________________________

2.) The motion of the particles in a gas is ______________________________________________________________________________________

3.) All collisions between particles in a gas are perfectly elastic _________________________________________________________ _________________________________________________________

Gas Pressure Gas pressure = _______________________________________

_______________________________________

**atmospheric pressure = ____________________________________________________________________________________

measured with a barometer Units: kilopascal (kPa)

mmHg atm

torr 1 atm = 101.3 kPa = 760 mmHg = 760

torr

Nature of Liquids Particles are free to flow from one locations to another

BUT... The particles are attracted to each other via intermolecular forces.

Nature of Solids Particles are orderly and packed tightly together. Particles vibrate in fixed positions only

Most solid substances are crystalline. _______________________________________________________

Phase Changes

Liquid

Gas

Solid

Temperature

Temperature = a measure of the average _________________ of particles

= _____________________

**At a given temperature, the particles of all substances, regardless of physical state, have the same average kinetic energy.**

Kelvin Scale =_______________________________________________ boiling point of water = ____ Kfreezing pt of water = ____ K

absolute zero = ____ K

Reference Tables: - Table A (STP) - Table T (degrees Celcius to Kelvin

Phase Changes: Heating Curve

***A substance will change phase from solid to liquid to gas when heat energy is added.**

Phase Changes: Cooling Curve

***A substance will change phase from gas to liquid to solid when heat energy is lost.**

Heating/Cooling Curve Combined

Vaporization Vaporization = ___________________________________________

Evaporation : __________________________________________ : __________________________________________ __________________________________________

: ___________________________________________

Vapor Pressure = _____________________________________________

**(Remember: gas particles collide with the walls of the sealed container)**

In a system at constant vapor pressure, a dynamic equilibrium exists between the vapor and the liquid. The system is in equilibrium because the rate of evaporation of liquid equals the rate of condensation of vapor.

Vapor Pressure & Temperature:

How will temperature affect vapor pressure?

____________________________________________________________________________________________

Why?

_____________________________________________________________________________________________________________________________________________

**The higher the vapor pressure of a substance, the more volatile it is.

volatility = ______________________________

Boiling Point = __________________________________________________________________________________________________________________________________________________________________________________________

**Normal boiling point = boiling point of a substance at the standard

pressure of 101.3 kPa

Two factors affect the boiling point of a substance:

1.) Pressure ________________________________________________________

**Why does it take longer to cook food in water at high altitudes?**

2.) Intermolecular forces _________________________________________________________

Reference Tables: Table HReference Tables: Table H