chapter 13 – states of matter the kinetic theory 1.all matter is composed of very small particles...
TRANSCRIPT
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CHAPTER 13 – States of Matter
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THE KINETIC THEORY1.All matter is composed of
very small particles
2.These particles are in constant, random motion
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Kinetic Energy and Temperature“KINETIC” from a Greek word meaning “to move.”
Kinetic Energy: Energy of an object in motion
Temperature: A measure of the average kinetic energy of particles
Increase Temperature, ________ Kinetic Energy
Decrease Temperature, _______ Kinetic Energy
IncreaseDecrease
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Kinetic Energy of Gas Molecules
m = massv = velocity
**If you increase the temperature, particles move FASTER.
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The Four States of Matter
This figure shows the four states of
matter:
_______, ________, ______ and
__________(hydrogen nuclei and
electrons).
Solid Liquid Gas
Plasma
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The Four States of MatterSolids: - Have a definite shape and volume
- Particles vibrate about a fixed pointWater is a
solid below 0°C.
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The Four States of MatterLiquids:
- Flow, have a definite volume, and take the shape of its container
- Particles are close together, but move randomly
Water is a liquid
between 0°C and 100°C.
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The Four States of MatterGases: - Takes the shape and volume of its
container.
- Are highly compressible.
- Have very low densities.
Water is a gas above
100°C.
http://www.youtube.com/watch?v=s-KvoVzukHo
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The Four States of MatterPlasma: - The fourth state of matter
- Ionized gas or charged gas particles
- Behaves differently from gases:
(non-elastic collisions, attraction between particles, conducts electricity)
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Kinetic Energy and TemperatureIf you continue to reduce temperature, what happens to the kinetic energy?
All particle motion
stops at o K or -273°C.
Absolute zero (0 K, or –273°C)
The temperature at which the motion of particles theoretically stops.
• Particles would have no kinetic energy (or motion).
• Absolute zero has NEVER been produced in the laboratory.
http://www.youtube.com/watch?v=aOa14VQiu3Y
https://www.youtube.com/watch?v=TNUDBdv3jWI
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1. Kinetic energy is the energy of ____?An object in motion
2. An increase in temperature increases/decreases the kinetic energy.increases
3. State of matter that has a fixed volume and takes the shape of its container.
Liquid
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4. The temperature at which all motion stops?
Absolute Zero
5. The state of matter made of ionized gas particlesPlasma
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Temperature Scales
Fahrenheit:• Water freezes at 32˚ F • Water boils at 212˚F
Celsius (or Centigrade):• Based on the freezing (0˚C) and
boiling points (100˚C ) of water.
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Temperature ScalesKelvin:
• 0 K is Absolute Zero• No negative values in the Kelvin scale
Temperature Conversions0 K = -273oC
K oC subtract 273 oC K add 273
https://www.youtube.com/watch?v=TNUDBdv3jWI
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CHECK: Convert….
1. 86 K to oC
2. 58oC to K
3. 533 K to oC
4. -90oC to K
86 K - 273 = -187oC
58oC + 273 = 331 K
533 K - 273 = 260oC
-90oC + 273 = 183 K
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What Causes Pressure of a Gas? Pressure = Force /
Area
• Gas particles exert pressure when they collide with the walls of an object.
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Pressure
• Atmospheric pressure is the weight of air per unit of area.
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Measuring Pressure• A barometer is the
instrument we use to measure atmospheric pressure
• Atmosphere1.00 atm = 760 mm Hg
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Measuring Pressure• A manometer is another instrument used to measure
pressure
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1. kilopascals (kPa), 2. millimeters of mercury (mm Hg) 3. torr4. pounds per square inch
(lb/in2 or psi)5. atmosphere (atm)
UNITS OF PRESSURE
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Standard Pressure of a Gas
Measured at sea level:
1 atm = 101.3 kPa
= 760 mm Hg
= 760 torr
= 14.7 psi
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Pressure Unit Conversions1atm = 760 mmHg = 760 torr = 101.3kPa = 14.7psi
Do the following conversion problems:
1. 1.5 atm = kPa
2. 720 torr = atm
3. 75 kPa = mm Hg
4. 28.14 psi = atm
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Standard Temperature and Pressure: STP
• the standard T & P for experimental measurements, to enable comparisons to be made between sets of data usually when working with gases.
Standard temperature is 273 K or 0 °C
Standard pressure is 1 atm or 101.3 kPa
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Phase Changes
Courtesy www.lab-initio.com
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Energy Change of Phase Changes
solid liquid gas
Exothermic changes (kinetic energy or heat is released)
Endothermic changes (kinetic energy or heat is absorbed)
Deposition
Sublimation
Freezing
Melting
Condensing
Boiling
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Energy Change of Phase Changes
solid liquid gas
Exothermic changes (kinetic energy or heat is released or lost)
Endothermic changes (kinetic energy or heat is absorbed or gained)
Lose
Gain
Lose
Gain
Lose
Gain
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Chapter 13 Vocabularyso far….
Temperature
Kinetic Energy
Pressure
Absolute Zero
STP (Standard Temperature and Pressure)
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MORE Chapter 13 VocabularyExothermic - kinetic energy or heat is released
Endothermic - kinetic energy or heat is absorbed
Normal Boiling Point – temperature at which a substance boils (or condenses) at Standard Pressure (1 atm or 760 mm Hg)
Normal Freezing Point – temperature at which a substance freezes (or melts) at Standard Pressure (1 atm or 760 mm Hg)
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Heat Curve of Phase Changeshttp://www.kentchemistry.com/links/Matter/HeatingCurve.htm
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HEAT CURVE:Water phase
changes
Temperature remains __________during a phase change.
constant
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Phase Diagram
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MORE Chapter 13 Vocabulary
Triple Point – T and P at which all three phases (solid, liquid, gas) are present
Critical Point – T and P above which liquid and gas no longer exist as separate phases (above this, it is “supercritical fluid”)
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Phase Diagram for Water
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CarbonPhase
Diagram for Carbon
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Gases – Kinetic Molecular Theory1. All matter is composed of very
small particles
2. These particles are in constant, random motion
3. Collisions between gas particles are perfectly elastic
4. Gas particles are very small and are very far apart.
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Kinetic Energy of Gas Molecules
m = massv = velocity
**At any given temperature, the molecules of all gases have the same AVERAGE kinetic energy.
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Kinetic Molecular Theory
The average kinetic energy of the molecules is proportional to the absolute temperature.
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Kinetic Energy of Gas Molecules
Mixture of He (4 g/mol) and Ne (20 g/mol):
Say the mixture has a KE = 2 J
He: 2 J = 0.5 x (4 g) x (1m/s)2 v = 1 m/sNe: 2 J = 0.5 x (20.2 g) x (0.44m/s)2 v = 0.44 m/s
Bigger gas particles move more __________.
http://www.youtube.com/watch?v=UNn_trajMFo (34 sec)
Slowly
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Kinetic-Molecular TheoryLarger molecules (with more mass) move more slowly.
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Diffusion of GasesDiffusion is the tendency of molecules to move toward areas of lower concentration until the concentration is uniform throughout.
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Diffusion of GasesDiffusion is the tendency of molecules to move toward areas of lower concentration until the concentration is uniform throughout.
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Kinetic-Molecular TheoryLarger molecules (with more mass) move more slowly.
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GRAHAM’S LAW OF DIFFUSIONIf two gases (A and B) are at the same temperature, the molecules have the same average KE.
½ mAvA2 = ½ mBvB
2
rearranging:
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GRAHAM’S LAW OF DIFFUSIONThe rate of effusion or diffusion is inversely proportional to the molar mass of the molecule.
Mixture of He (4 g/mol) and Ne (20.2 g/mol):
Which molecule moves faster?
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GRAHAM’S LAW OF EFFUSIONExample: What is the ratio of effusion rates for ammonia (NH3) and hydrochloric acid (HCl)?
NH3 (17.0 g/mol) and HCl (36.5 g/mol):
Which molecule moves faster?
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GRAHAM’S LAW OF EFFUSION1. Find the ratio of diffusion rates of helium and
chlorine gas:
2. Find the ratio of diffusion rates of oxygen and nitrogen gases:
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PressurePressure definition:
Force per unit area
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Dalton’s Law of Partial PressuresIn a mixture of gases, the total pressure is the sum of
the partial pressures of the component gases.
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Dalton’s Law – Partial Pressures• The contribution each gas in a mixture makes to the total
pressure is called the partial pressure exerted by that gas.
Ptotal = PA + PB + PC
Ptotal = 100 kPa + 250 kPa + 200 kPa
Ptotal = 550 kPa
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Dalton’s Law – Another ProblemA gas mixture containing oxygen, nitrogen, and carbon dioxide has a total pressure of 32.9 kPa. If PO2 = 6.6 kPa and PN2 = 23.0 kPa, what is PCO2?
Ptotal = PO2 + PN2 + PCO2
32.9 kPa = 6.6 kPa + 23.0 kPa + PCO2
PCO2 = 32.9 kPa – (6.6 kPa + 23.0 kPa) = 3.3 kPa
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Real Gases
In the real world, the behavior of gases only conforms to the ideal-gas equation at relatively high temperature and low pressure.
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Deviations from Ideal Behavior
The assumptions made in the kinetic-molecular model break down at high pressure and/or low temperature.
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Deviations from Ideal Behavior
NEED TO ADD – MORE DEVIATION FOR LARGE? MOLECULES AND POLAR MOLECULES
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Avogadro’s Principle• Use for gas stoichiometry problems – • “Liter to Liter” conversions
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Liter-Liter Conversions - Example
What is the total number of liters of NO(g) produced when 1.6 liters of O2 reacts completely with nitrogen at constant temperature and pressure?
N2 (g) + O2 (g) 2 NO (g)
Given (L of the known) # liters unknown= calculated L of unknown
# liters known
GIVENMOLE RATIO FROM BALANCED
CHEM EQN
1.6 L O2 2 L NO= 3.2 L NO
1 L O2
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Liter-Liter Conversions - Example
If I have 13 L of N2 and excess H2, how many liters of NH3 can I make at constant temperature and pressure?
N2 (g) + 3 H2 (g) 2 NH3 (g)
Given (L of the known) # liters unknown= calculated L of unknown
# liters known
GIVENMOLE RATIO FROM BALANCED
CHEM EQN
13 L N2 2 L NH3= 26 L NH3
1 L N2