His theory was labeled the "greenhouse effect" because carbon dioxide traps heat inthe earth’s atmosphere. Fourier’s theory was challenged by Mulutin Milankovitch‚ who proposed the earth’s changing temperatures were nothing more than a result of orbital changes of earth.But again in the 1950s‚ G.S. Callendar supported Fourier’s greenhouse effect‚ and his work led others to increase their reserach effortts into the concept of global warming. Over 20 mathematical models have been used to analyze global
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Katherine Coleman Goble Johnson is an African-American mathematician and physicist who is known for calculating the trajectories for many NASA missions. She was born on the 26th of August‚ 1918 in the town of White Sulphur Springs‚ West Virginia. Katherine was a very brilliant child and by the age of 13 she was attending the black West Virginia State College’s high school. At 18‚ she enrolled in the actual college graduating in 1937 with the most advanced honors. In 1939‚ Katherine was handpicked
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Study Guide 1. Write down the electron configuration for the following atoms (see page 135 in your textbook): Mg Ne Zn 2. Which elements have the following electron configurations? a. 1s22s2 b. 1s22s22p63s23p1 3. Sketch the shape of the following orbitals: s p d 4. Define the term “quantum.” 5. Using the diagram of the atom‚ on the right‚ identify the following: a. Which arrow(s) indicate that electrons absorbed energy? b. Which arrow(s) indicate that electrons lost/emitted energy as light
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The University of the West Indies (Mona) Department of Chemistry Preliminary Chemistry A (Chem 0901) Atomic Structure: Tutorial 2 For discussion in the week beginning September 24‚ 2012. Answers should be submitted by 9:00 am on Monday September 24‚ 2012 in the box provided. Please write your ID number and Laboratory day clearly on your script. 1. Give an expression for the Balmer-Rydberg equation in terms of wavelength λ‚ the Rydberg constant R‚ and the integers m and n where m < n.
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each reaction. What’s the one key factor that can prevent this reaction from occurring? * In the SN2 reaction‚ the big barrier is steric hindrance. Since the SN2 proceeds through a backside attack‚ the reaction will only proceed if the empty orbital is accessible. The more groups that are present around the vicinity of the leaving group‚ the slower the reaction will be. That’s why the rate of reaction proceeds from primary (fastest) > secondary >> tertiary (slowest) * In the SN1 reaction
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you will see the moon and the 8 different phases it goes through. They can be very beautiful or even interesting. Lunar phases happen because the sun’s light reflects off the moon to us earth observers. So depending on where the moon is on its orbital path around the earth‚ gives us our lunar phases. Due to the Moon’s revolution around the earth‚ we see that light as different shapes called phases. The strong gravitational pull of the sun keeps the orbit of the earth and all the other planets
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made rather different from their free condition by the proximity of other nucleons charge independence of nuclear forces demand the existence of neutral meson as amongst the same type of nucleolus (P-P) or (N-N). this force demand the same spin & orbital angular momentum. The exchange interaction in produced by only a neutral meson. The involving mesons without electric charge‚ that it gives exchanges forces between proton & Neutron & also therefore maintains charge in dependence character. It is
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Wernher Von Braun‚ a German‚ American‚ aerospace engineer and space architect. He invented two of the most important rockets in the history of rockets‚ the V-2 and the Saturn V. Both of these rockets were very important to the development and furtherment of Missiles and Space Travel. Von Braun was born in 1912 in the Posen Province of then Germany. However after World War One this province was integrated into Poland. Early in his life‚ he stumbled on the book Die Rakete zu den Planetenräumen by Hermann
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valence electrons does a helium atom have? a. 2 c. 4 b. 3 d. 5 ____ 11. How many valence electrons are in a silicon atom? a. 2 c. 6 b. 4 d. 8 ____ 12. What is the name given to the electrons in the highest occupied energy level of an atom? a. orbital electrons c. anions b. valence electrons d. cations ____ 13. How does calcium obey the octet rule when reacting to form compounds? a. It gains electrons. b. It gives up electrons. c. It does not change its number of electrons. d. Calcium does not
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9.2 Space Students learn to: Students: 1. The Earth has a gravitational field that exerts a force on objects both on it and around it define weight as the force on an object due to a gravitational field perform an investigation and gather information to determine a value for acceleration due to gravity using pendulum motion or computer-assisted technology and identify reason for possible variations from the value 9.8 ms-2 gather secondary information to predict the value of acceleration
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