solids, liquids, & gases i. states of matter kinetic molecular theory four states of matter ...
TRANSCRIPT
Solids, Liquids, & Gases
I. States of MatterKinetic Molecular Theory
Four States of Matter
Thermal Expansion
MATTER
A. Kinetic Molecular Theory
KMT
All matter is composed of small particles (atoms, molecules, ions).
These particles are in constant, random motion.
Motion is dependent on temperature. Higher temp. = higher KE.
Thermal energy Total energy of a material’s particles KE – vibration and movement between
particles PE – results from forces acting within
or between particles Thermal Energy (Heat) = KE + PE
A. Kinetic Molecular Theory
B. Four States of Matter
Solids low KE - particles vibrate but
can’t move around definite shape & volume crystalline - repeating
geometric pattern amorphous - no pattern (e.g.
glass, wax)
B. Four States of Matter
Liquids higher KE - particles can
move around but are still close together
indefinite shape definite volume
B. Four States of Matter
Gases high KE - particles can
separate and move throughout container
indefinite shape & volume
B. Four States of Matter
Plasma very high KE - particles collide with
enough energy to break into charged particles (+/-)
gas-like, indefiniteshape & volume
stars, fluorescentlight bulbs, TV tubes
C. Thermal Expansion
Most matter expands when heated & contracts when cooled.
Temp causes KE. Particles collide with more force & spread out.
EX: thermostats (bimetallic strip), sidewalks
Solids, Liquids, & Gases
II. Changes in StatePhase Changes
Heating Curves
MATTER
A. Phase Changes
Melting solid to liquid
Freezing liquid to solid
melting point = freezing point
A. Phase Changes
Vaporization (boiling) liquid to gas at the boiling point
Evaporation liquid to gas below the boiling point
Condensation gas to liquid
A. Phase Changes
Sublimation solid to gas EX: dry ice,
freeze drying, iodine
A. Phase Changes
B. Heating Curves
Kinetic Energy motion of particles related to temperature
Potential Energy space between particles related to phase changes
B. Heating Curves
Solid - KE
Melting - PE
Liquid - KE Boiling - PE
Gas - KE
B. Heating Curves
Heat of Fusion energy required to change from solid
to liquid some attractive forces are broken
B. Heating Curves
Heat of Vaporization energy required to change from liquid
to gas all attractive forces are broken EX: steam burns, sweating, and… the
drinking bird
HEATING CURVE
Solids, Liquids, & Gases
III. Properties of FluidsArchimedes Principle
Pascal’s Principle
Bernoulli’s Principle
Fluid Flow
MATTER
A. Archemides Principle
Buoyant force of an object in a fluid is equal to the weight of the fluid displaced
A. Pascal’s Principle
Pressure applied to a fluid is transmitted unchanged throughout the fluid.
A. Bernoulli’s Principle
Pressure exerted by a fluid decreases as its velocity increases.
Solids, Liquids, & Gases
IV. Behavior of Gases Pressure
Boyle’s Law
Charles’ Law
Gay-Lussac’s Law
MATTER
A. Pressure
area
forcepressure
Which shoes create the most pressure?
A. Pressure
Key Units at Sea Level
101.325 kPa (kilopascal)
1 atm
760 mm Hg
14.7 psi 2m
NkPa
A. Pressure
Barometer
Atm
osph
eric
Pre
ssur
e
Manometer
Con
tain
ed P
ress
ure
A. Pressure
Effect on Boiling Point When atmospheric pressure
increases, the boiling point of a liquid increases.
EX: high altitude cooking, boiling cold water
B. Boyle’s Law
When the volume of a gas decreases, its pressure increases (at constant temp).
P
V
PV = k
INVERSE
kT
VV
T
C. Charles’ Law
When the temperature of a gas increases, its volume also increases (at constant pressure).
DIRECT
C. Charles’ Law
Absolute Zero - Temp at which... the volume of a gas would equal zero. all particle motion would stop.
-273°Cor
0 K
kT
PP
T
C. Gay-Lussac’s Law
The pressure and absolute temperature (K) of a gas are directly related at constant mass & volume