Basic structure of Matter and the Earth By Doba D. Jackson, Ph.D. Associate Professor of Chemistry &...
-
Upload
arthur-fletcher -
Category
Documents
-
view
219 -
download
0
Transcript of Basic structure of Matter and the Earth By Doba D. Jackson, Ph.D. Associate Professor of Chemistry &...
Basic structure of Matter and the Earth
By Doba D. Jackson, Ph.D.
Associate Professor of Chemistry & Biochemistry
Huntingdon College
Information on the Professor
Name: Doba Jackson, Ph.D.Specialty: Biophysical ChemistryRank: Associate ProfessorDepartment: Chemistry & BiochemistryCollege: Huntingdon College (main campus)Primary courses: Physical Chemistry, Biochemistry, Organic Chemistry, General ChemistryContact Email: [email protected] Office: 334-833-4269 (Montgomery)
How to Study for this class
Time: For every 1 hour class, you should spend 2 hrs of studying (minimum). Thus 8 hours on average for a 4 hour class period.
Taking Notes:Unlike most classes, you don’t need to write down my conversation. Occasionally I will give you something you need to remember but not often. Also the PowerPoint's will be made available.
How to Study for this classIn Class QuestionsYou should pay particular attention to questions we work on in class. These questions will be very similar to test problems. Try to follow in class and review them after class and prior to the test.
Homework: End of Chapter Problems:You must work on the end of chapter questions outlined in the syllabus. The selected questions may or may not be similar to the quiz or exam questions given in class.
Outline of Lecture 1• Part I: Matter & Matter changes
– Natural Science-Physical Science– Physical & Chemical Properties– Elements of Nature– Temperature, Pressure– Physical States of Matter
• Part II: Origin of the Universe and matter– Big Bang (video)– Formation of atoms, elements– Formation of galaxies, our solar system
Outline of Lecture 1• Part III: Structure & Components of Earth
– Earth’s Core– Earth’s Mantle– Earth’s Crust– Lithosphere– Asthenosphere– Rock Cycle (sedimentary, Metamorphic, Igneous)– Plate Tectonic Theory (intro)– Geologic Time (intro)
Part I: Matter and Matter Changes
Part I: Matter and matter changes Learning Outcomes
1. Describe the different elements and states of matter and their general physical properties
2. Distinguish between different physical states of matter.
3. Distinguish between Physical changes and chemical changes
4. Understand how the universe and matter was created (Big Bang)
Natural Science, Physical Science
Natural Science- a branch of science that is concerned with the knowledge of natural phenomena, based on observation, experience, or experimentation.
Natural Science
Physical Science
Biological Science
Biology Chemistry
Physics
Earth Science
Astronomy
Science follows the scientific method which is an ongoing process
Organization of the Periodic Table
Elements are listed in groups (columns) and rows.
Elements in a specific column and row have properties that are similar.
Elements that are on the left are called metals because they are solids at room temperature.
Elements on the right are liquids and gases at room temperature
Elements at the top are small atoms and the bottom are large atoms
Simple Atomic Model
Some Chemical Properties of the Elements
MetalsNonmetals
Chemistry and the Elements
You should know the boxed elements and their symbols.
Each Element has its own properties
Physical Properties: Characteristics that do not involve a change in a sample’s chemical makeup.
Chemical Properties: Characteristics that do involve a change in a sample’s chemical makeup.
Mass & MatterMass: Amount of matter in an object.
Matter: Describes anything with a physical presence—anything you can touch, taste, or smell. All matter has a mass.
Weight: Measures the force with which gravity pulls on an object. Weight is proportional to mass because gravity on the earth’s crust is a constant
Temperature and Its Measurement
(°F - 32 °F)5 °C9 °F
°C =
°C + 32 °F9 °F5 °C
°F =
K = °C + 273.15
Fahrenheit to Celsius
Celsius to Fahrenheit
Celsius to Kelvin
Absolute Temperature
You don’t have to know the equations
Pressure
Pressure = Force/Area
Measurement of Pressure
• Evangelista Torricelli, in 1863 first devised
a method for measuring the pressure of an
atmosphere using a mercury barometer.
Aneroid Barometer
Mercury Barometer
Water Barometer
Pressure:Unit area
Force
Gases and Gas Pressure
Phase change is a Physical Change
• Phase- A form of matter that is uniform throughout in chemical composition and physical state
• Phase Transition- The spontaneous conversion of one phase to another
Single Phase Multiple Phase
Phase changes are spontaneous events depend on the temperature and pressure
Phase diagrams illustrates the most stable phase at a each temperature and pressure
Phase Diagram for Carbon Dioxide
Phase Diagram for Water showing multiple solid forms of Ice I-XI
Ice- I
Phase diagram of SiO2 (sand)
Part II: Origin of the Universe, Solar System
The history of the universe can be divided up into several phases
Big Bang0 seconds
The universe began with a vast explosion that generated space and time, and created all the matter and energy in the universe. Exactly what triggered this sudden expansion remains a mystery.
The history of the universe can be divided up into several phases
Forces, protons, neutrons, electron form1 second after
The universe began cooling and the most basic forces in nature emerged: first gravity, then the strong force, which holds nuclei of atoms together, followed by the weak and electromagnetic forces. In its first second of existence, the universe was made up of fundamental particles, including electrons, photons, and neutrinos.
The history of the universe can be divided up into several phases
Hydrogen nuclei form3 minutes afterProtons and neutrons form and the nuclei of simple elements Hydrogen and Helium form. That the universe remains largely made up of these elements—hydrogen and helium—is considered strong evidence of the validity of the big-bang model
Hydrogen: 1 proton, 1 electron
Helium: 2 protons, 2 neutrons 2 electrons
The history of the universe can be divided up into several phases
Basic elementsH, He form500,000 yrs afterIts protons, neutrons and electrons came together to form the nuclei of simple elements Hydrogen and Helium. That the universe remains largely made up of these elements—hydrogen and helium—is considered strong evidence of the validity of the big-bang model
Hydrogen: 1 proton, 1 electron
Helium: 2 protons, 2 neutrons 2 electrons
The history of the universe can be divided up into several phases
Stars, Galaxies form1,000,000,000 yrs afterAs time moved forward, the pull of gravity exerted its influence on the early universe. Even as the universe as a whole continued to expand, pockets of gas became more and more dense. Stars ignited within these pockets. Groups of stars then became the earliest galaxies. Modern telescopes can detect these primordial galaxies as they appeared when the universe was only one billion years old, just 7 percent of its present age.
The history of the universe can be divided up into several phases
Our sun, Milky Way5,000,000,000 yrs after
The sun formed within a cloud of gas in a spiral arm of the Milky Way galaxy. A vast disk of gas and debris that swirled around this new star coalesced into planets, moons, and asteroids
The history of the universe can be divided up into several phases
End of the universe1099 yrs afterExpansion and cooling will continue until all stars (& Sun) lose energy. At this late stage, protons will have decayed and black holes will have almost completely evaporated. Only the byproducts of these processes remain: mostly neutrinos, electrons, positrons, and photons of enormous wavelengths. For all intents and purposes, the universe as we know it will have come to an end.
Solar System; Milky Way
Terrestrial planets
Jovian planets
Planet systems• Terrestrial Planets- Mercury, Venus,
Earth, Mars. • Jovian Planets- Jupitor, Saturn, Uranus,
Neptune. (Pluto not included)
Terrestrial Planets Jovian Planets
Distance from the sun
Close to the Sun Far from the Sun
Size Small size Large size
Internal Core Metallic core surrounded by rock
Rocky core surrounded by gases
Surface Atmosphere
Nitrogen, Oxygen, CO2 Hydrogen, Helium, Methane
Moons Few if any moons Large number of moons
Part III: Structure of the Earth
Earth can be looked at as a complex system consisting of many parts
Atmosphere is the gases surrounding the earth that are part of the earth’s gravitational field
Hydrosphere is the sum of allthe water of various physical states in and
around the earth
Biosphere is the sum of all ecosystems in and around the earth
Lithosphere is the combination of the upper mantle, athenosphere and earth’s crust that surrounds
the surface of the earth
Earth formed from a swirling eddy of nebular material 4.6 billion years ago, accreting as a solid body and soon thereafter differentiating into a layered planet during a period of internal heating.
How did the Earth Form?
Core- consists mostly of Fe and a small amount of Ni.
Volume- 16% of earth
Outer core- Liquid with density of 10-12 g/cm3
Inner core- Solid with density 12-13 g/cm3
Earth core is a solid Metallic Fe and Ni
Outer core- estimated at 2500*C to 5000*C
Inner Core- estimated at 6500*C
- Temperature measurements are estimated based on the melting points of the minerals and elements.
Earth core is very hot with temperatures estimated at
6500˚C
Origin of Earth’s Heat:
1) Residual heat left over from the Big Bang occupies the inner core.
2) Radioactive decay of mineral isotopes Uranium, Thorium and Potassium which occupy the mantle.
Where does Earth’s heat come from?
Rock is a poor conductor of heat so it insulates the heat internally within the earth.
- Pressure of the Earth’s core is estimated at 3.5 million times the Atmospheric pressure (3,500,000 atm).
Earth core is under extremely high pressure
The Earth and all other planets have a Magnetic Field
- Electrical currents in the (liquid Iron) outer core probably generate Earth's magnetic field. The lines of magnetic field surrounding Earth resemble those of a bar magnet.
Where and how is Earth’s magnetic field generated?
Ferromagnetism
Although it is not clear how exactly the Earth generates amagnetic field, magnetic fields are generated by certainmaterials that have unpaired electrons or generate anelectrical current.
Ferromagnetic- materials that have magnetic properties. They are strongly attracted to magnets and that includes the earths magnetic field.
Ferromagnetic RocksNorth
South
When an rock solidifies with a element that has an unpaired electron, the element tends to orient its magnetic field against the earth’s magnetic field.
Curie Point- the temperature at which a rock containing magnetic elements will solidify.
Lodestone, Magnetite, Maghemite- iron containing mineral rocks with magnetic properties (Fe3O4).
Mantle- dark dense rock containing Fe and Mg (silicates- SiO4).
Volume- 83% of earth
Density- solid rock of peridotite has a density of 3.3-5.7 g/cm3
Earth’s Mantle consists mainly of a rock called
Peridotite
Earth's Mantle—The Layer Below the Crust
• How did geologists come to the conclusion that the mantle is probably made up of peridotite?
• Experiments indicate that peridotite has the physical properties and density to account for seismic wave velocity in the mantle.
• Peridotite is also found as inclusions in kimberlite pipes that came from depths of 100 to 300 km.
Continental Crust- Density of 2.7 g/cm3. Rock- granite.
Depth- 20-90 km Oceanic Crust-
Density of 3.0 g/cm3. Rock- Basalt.Depth- 5-10 km
Volume- 1% of earth
Earth’s Crust consists of an Oceanic and Continental crust
forms
Seismic Waves are used to probe Earth’s Internal Structure
• How do geologists study Earth’s interior?– When an Earthquake
occurs, energy in the form of seismic waves radiate out from the point of release.
– P-waves (push-pull waves) similar to sound waves and can travel through solids, liquids and gases.
– S-waves (shear waves) move material perpendicular to the direction of travel and can only travel through solids
Seismic waves used to probe the Earth’s Core
• How do P & S-waves travel through the Earth?
Earth's Crust—Mantle Boundary was found by seismic wave experiments– The boundary between the crust and mantle is known
as the Mohorovicic Discontinuity. It was named after It was discovered when Yugoslavian Seismologist Andrija Mohorovičić who noticed that seismic stations received two sets of P- and S-waves.
The boundary between the Mantle and the Earth’s Crust makes up
the Lithosphere
The crust and upper mantle comprise the lithosphere.
The lithosphere is composedof rigid plates that diverge,converge, or slide sidewayspast one another.
Asthenosphere- region between the upper mantle and lower mantle. This is a region known to produce magma (lava).
The Asthenosphere is plastic rock due to high temperature and
pressure
Asthenosphere- region between the upper mantle and lower mantle.
Temperature- 1000-2500*C
Depth- 80-200 km (beginning) - 700 km (ending)
This is the temperature and pressure that most rocks found on the crust will melt.
Plate Tectonic theory• Plate tectonic theory states that the lithosphere is
divided into rigid plates that diverge, converge, or slide past each other as they move over the asthenosphere.
Plate Tectonic theoryThe movements of the plates and the interactions of plates along their boundaries cause volcanic eruptions, earthquakes, the formation of mountain ranges and ocean basins, and recycling of rock material.
The Rock Cycle
• What is a rock?– A rock is an aggregate of minerals.
Granite Limestone Conglomerate
Slate GneissQuartzite
The Rock Cycle
The Rock Cycle• What are the characteristics of each of
the three major rock groups?
• Igneous rocks result from the crystallization of magma or the consolidation of volcanic ejecta.
The Rock Cycle• Sedimentary rocks are typically
deposited in layers formed by the:
– consolidation of rock fragments
– precipitation of mineral matter from solution
– compaction of plant or animal remains
The Rock Cycle• Metamorphic Rocks- that result from the
alteration of other rocks;
– Metamorphic rocks usually form beneath Earth’s surface, by• Heat• Pressure• Chemically active
fluids.
The Rock Cycle connects the internal and external processes of the earth
Plate Tectonic theory• Plate tectonic theory states that the lithosphere is
divided into rigid plates that diverge, converge, or slide past each other as they move over the asthenosphere.
Plate interaction is a major factor that determines when, where and what kind
of rock develops.
Plate Tectonics?
Geological Time
Radioactive Decay Example
e-1
0C
6
14N
7
14+
- N is the number of radioactive atoms per minute per gram Carbon
- N0 is the initial number of radioactive atoms per and per gram Carbon
- k is the decay constant for carbon- t is the age of the sample
Nt
N0
Ln = -ktEquation:
Geological Time• Eon- Time periods around .5 to 1 billion
years.• Era- Time periods between 100 million
and 500 million years. These occur within Eons.
• Periods- Time periods between 10 million and 100 million years.
• Ages-
No
Early Evidence for Plate Tectonics: Continental Drift Hypothesis
The idea that continents have moved in the past is not new and goes back to the first maps, in which one could see that the east coast of South America looks like it fits into the west coast of Africa.
Pangaea
Scientists responsible for Continental Drift hypothesis
• Abraham Ortelius (1596)- developed the first map and theorized that continents drifted across oceans to their present positions.
• Edward Suess (1885)- First to propose that continents were connected based on fossil evidence. Named southern continents as Gonwana.
• Alfred Wegener (1915)- credited for the continental drift hypothesis. (Named supercontinent Pangaea)
• Harry Hess (1962)- revised the continental drift theory into the Plate Tectonic theory.
Abraham Ortelius developed the first map of the worldOrtelius was a world renown English geographer in his day. He spent his life making regional and continental maps. Through lots of partnerships, and traveling, he was able to develop the first maps of the world.
Latin: Theater of the World He suggested after publishing his 33rd map of the world: “The America’s may had originally been joined together but later drifted away by earthquakes and floods” in 1578
Edward Suess was the first to provided fossil evidence for the continental drift hypothesis Edward Suess
1831-1914
Glossopteris flora- The fossil flora that succeeds the Permian glacial deposits of South Africa, Australia, South America, and Antarctica. It grew in a cold, wet climates. Plants with elongate, tongueshaped leaves dominated the southern flora.
Austrian Geologist Edward Suess proposed the southern continents were once
connected and used the term Gondwana
Alfred Wegener noted similairities of rock sequences for southern
continents
Glacial Evidence in bedrock found in South America, India, South
Africa and Australia
Fossil evidence supports a continental drift hypothesis