Katherine G. Johnson is a mathematician who calculated the trajectories responsible for launching the first American into space. Katherine was born on August 26th‚ 1918 in White Sulfur Springs‚ West Virginia. As a child‚ Katherine loved to count and had a strong interest in numbers which led to her profound knowledge of mathematics. Her passion for numbers showed through her interest in advancing her education‚ she graduated from the eighth grade by the age of ten; then graduated from high school
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Alkyl Halides Alkyl halides are a class of compounds where a halogen atom or atoms are bound to an sp3 orbital of an alkyl group. CHCl3 (Chloroform: organic solvent) CF2Cl2 (Freon-12: refrigerant CFC) CF3CHClBr (Halothane: anesthetic) Halogen atoms are more electronegative than carbon atoms‚ and so the C-Hal bond is polarized. H H μ C + C-l δ δ H The C-X bond is polarized in such a way that there is partial positive charge on the carbon and partial negative charge on the halogen. Dipole moment
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Classification of matter • All the objects and substances that we see in the world are made of matter. • This matter can be classified according to whether it is a mixture or a pure substance. • A mixture is a combination of two or more substances‚ where these substances are not bonded (or joined) to each other and no chemical reaction occurs between the substances. Examples of mixtures are air (a mixture of different gases) and cereal in milk. • The main characteristics
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Body Paragraph 1: Basic Facts Eigth and last planet in the solar system Mean density (kg/m3):(Neptune)1‚638 (Earth) 5‚514 (Neptune/Earth Ratio) 0.297 Neptune‚ like Uranus‚ is one of the two outer planets known as an "ice giant." Made up of more ices than Jupiter and Saturn‚ the chilly body almost seems to be in a class by itself. Body Paragraph 2: Atmosphere Neptune’s atmosphere is made up predominately of hydrogen and helium‚ with some methane. The methane is part of what gives Neptune
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Graves’ Disease Hyperthyroidism and Treatments 0 comments Graves’ disease is the leading cause of hyperthyroidism. Complications can include hypertension‚ cardiac arrhythmias and thyroid eye disease but treatments are available. Jim Lowrance Posted on Aug 7‚ 2009 Graves’ disease is an autoimmune condition affecting the thyroid gland that results in abnormally high levels of thyroid hormone to be released into the body causing hyperthyroidism. There is no cure for Graves’ but progression of
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The History of the Atom Hypothesis according to Aristotle (350 BC): All matter consists of the elements earth‚ air‚ fire‚ and water. Experiment: A tree grows from the earth as water is added. The tree is then set on fire in an effort to form new elements. 1. What kind of results would be observed from this experiment? Fire‚ ash (earth)‚ smoke (air) 2. Would these observations support or reject the hypothesis? Explain. Support. No elements have been produced that are something other than
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Space Shuttles: | The Life of Them | | Kionna Jones | | 7th period | 11/29/2010 | | Space Shuttles The Space Shuttle is an American spacecraft operated by the National Aeronautics and Space Administration (NASA) for orbital human spaceflight missions. The Space Shuttle is part of the Space Transportation System (STS). Space Shuttles are one of the most talked about aircrafts. The Shuttle is a reusable launch and reentry vehicle that saves on the costs that were once required
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The Climate Change Debate: Man vs. Nature The public discussion on climate change has become so polarized that some scientists don’t even acknowledge there is a debate. Climate scientist at NASA’s Goddard Institute for Space Studies‚ Gavin Schmidt‚ is one of those people. "There aren’t ’two sides’ to the science‚ nor to the policy response‚" Schmidt said. "This implies that the whole thing is just a matter of an opinion – it is not." Another group of scientists would disagree with Schmidt
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Are Serial Killers Born or Made? The term serial killer‚ as defined by Robert Ressler (1974)‚ refers to a person who commits a series of murders‚ often with no apparent motive and typically following a characteristic and predictable behaviour pattern. Commonly used terms like sociopath and psychopath are no longer used in a clinical setting. Instead‚ these pathologies fall under a condition called anti-social personality disorder. A sociopath is traditionally defined as a person with a personality
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UNIVERSITI TEKNOLOGI PETRONAS CHEMISTRY 1 (FAC 0015) – FOUNDATION TRIMESTER MARCH 2015 Lecturers Dr Ruzaimah Nik Mohamad Kamil‚ Dr Normawati Mohamad Yunus‚ Assoc. Prof. Dr Isa M Tan‚ Assoc. Prof. Dr Noor Asmawati M Zabidi‚ Dr. Lim Jun Wei‚ Dr. Aamir Hussain Bhat‚ Dr. Mahdieh Course Outcomes At the end of the course‚ students should be able to: 1. Explain the basic concepts in the fundamentals of chemistry. 2. Solve chemistry problems using the basic fundamentals of chemistry. 3. Apply the fundamental
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