Chapter 16 – SOLIDS, LIQUIDS & GASES. Section 1 – KINETIC THEORY.
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Transcript of Chapter 16 – SOLIDS, LIQUIDS & GASES. Section 1 – KINETIC THEORY.
Chapter 16 –
SOLIDS, LIQUIDS &
GASES
Section 1 –
KINETIC THEORY
States of Matter
GAS
The Kinetic Theory
Explains how particles behave– All matter is made of small particles
– These particles are in constant, random motion
– Particles collide with each other & with the walls of containers
•Total energy of a material’s particles
•Causes particles to vibrate in place
•How fast the particles are moving
•The the temp, the slower the motion
= temperature of a substance
Solid State of MatterParticles closely packed together in specific geometric arrangement
Heat of FUSION
Liquid State of MatterLiquids flow and take the shape of their container
Solids begin to liquefy at the melting point as particles gain energy to overcome arrangement
Gaseous State of MatterGases spread evenly throughout their container (diffusion)
When a liquid has enough energy to escape the attractive forces of other particles
Gaseous State of MatterHeat of Vaporization
–Energy changing a liquid to a gas
At the boiling point – –Pressure of the liquid’s vapor
= the presure of the atmosphere
Heating Curve of a
Liquid Melting
Point & Freezing
Point
Boiling Point
Plasma State of MatterHigh temperature gasBalanced positively and negatively charged particles –Most abundant state
Thermal ExpansionIncrease in the size due to an
increase in temperature
If temp then size
Happens in most solids, liquids &
gasesWater is an exception – it expands
as it becomes a solid!
Exceptions – these do not act as expected -
Amorphous Solids
Liquid Crystal
s
AMORPHOUS SOLIDSLack tight ordered structure–No definite temperature for change from solid to liquid.
–Glass, ceramic & plastics
LIQUID CRYSTALSDon’t completely lose ordered arrangement upon melting–Used in LCD’s–Watches, clocks, notebook computers & TV’s
Properties of FluidsChapter 16 - 2
Buoyant Force Buoyancy = the ability of a fluid to exert
an upward force on an object immersed in it.
Buoyant Force – the supporting force on an immersed objectIf force = weight, object will…
FLOAT
If force is less than weight, object will…
SINK
Archimedes’ Principle
The buoyant force on an object is equal to the weight of the water displaced by the object
Which has a higher buoyant force, a baby in a bath tub or a 40 year old
person? The older one b/c he
displaces more water.
Density…D = m /
v
Objects will float if their density is less that the density of the fluid it is
placed inWhy do ships float???
Pascal’s Principle
Pressure applied to a fluid is transmitted throughout
the fluid.
What are some everyday examples of this?
Toothpaste tubes, balloon animals
Bernoulli’s Principle
As velocity of a fluid increases, the pressure
exerted by the fluid decreases.
The faster air flows over the wings.
What do we know about the pressure above the wing? It’s lower!
Viscosity = resistance to flow Different structures cause different
tendencies to flow Particles “pull” other particles with
them increasing the flow As temperature increases, viscosity
decreases allowing for easier flow Ex: Honey has a higher viscosity than
water, b/c it does not flow as easily.
Sec. 16.3
Behavior of Gases
Pressure :
•SI Unit = Pascals (Pa)
•Pressure = Force/Area
•Collisions of particles in air result in atmospheric pressure – Highs and Lows in weather
•Particles colliding with walls of a container create GAS pressure
Why does this balloon stay inflated?
The particles in air striking the balloon’s walls forces them outward.
1. Boyle’s Law – relates pressure and volume
•British scientist, Robert Boyle
•At a constant temp, volume of gas decreases as pressure increases. (inverse relationship)
•P1V1 = P2V2
•Why does a weather balloon expand as it rises in the atmosphere?
2. Charle’s Law – relates volume and temp
•French scientist, Jacques Charles
•At a constant pressure, volume increases as temp increases. (direct relationship)
•V1T2 = V2T1
•Explain this using Kinetic Theory of Matter.
3. Gay-Lussac’s Law – relates pressure and temp
•At a constant volume, as temp increases, pressure increases. (what kind of relationship is this?)
•T1P2 = T2P1
•Explain what will happen to a canister that says “keep away from heat” if placed in a heated area?