...Example: An open-minded person is one who can modify plans or discard hypotheses if necessary. One such person was Johannes Kepler who was hired to develop evidence that planets moved along perfect circles. 4. A scientist is intellectually honest Example: Isaac Newton built his laws of motion on the previous work of Galileo and others. 5. A scientist works hard and is persistent Example: Marie Curie was the first person ever to be awarded the Nobel Prize twice. It was not surprising considering how hard she worked. 6. A scientist does not jump to conclusions Example: John Dalton's atomic theory was backed by experimental evidence. He was not the first to propose that the atom was the smallest particle of matter, but he was the first to use experimental evidence to support his theory. 7. A scientist is a creative and critical thinker Example: Albert Einstein was able to derive his theory of relativity because he went beyond what was given and known at that time. He saw links and connections where others did not. He looked at things from different perspectives. 8. A scientist is rational 9. A scientist is willing to suspend judgment until he is sure of his results 10. A scientist tries new approaches to arrive at solutions In addition: A scientist must have an open mind and be curious. It is fine to have an...
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...Answer He should be alert and be organised all the time. He should not be careless as there might be mistakes made, eg. using wrong chemicals as a result of unmarked beakers etc. He should also be humble and interested in the work he is doing. What he is doing should be for the good of humans and not just the scientist himself. He ought to be persistent and be willing to spend time for thourough research and try again and again before getting an answer to his research questions. He should never give up. He should be honest and carry out an honest research which is done by him or her self. Note: There are comments associated with this question. See the discussion page to add to the conversation. * Searching For Answers?www.Facebook.com Read more: http://wiki.answers.com/Q/Give_the_5_traits_of_scA good scientist should possess the following qualities: 1. A scientist must be curious about the world Example: Galileo Galileo's curiosity about the heavenly bodies made him the first person to use a telescope to study the moon, the sun, the planets and the stars. 2. A scientist is logical and systematic Example: Among the reasons why Gregor Mendel discovered the principles of heredity when others have failed was his logical experimental methods and his careful and accurate record keeping. 3. A scientist is open-minded and free of bias Example: An open-minded person is one who can modify plans or discard hypotheses if necessary. One such person was Johannes Kepler...
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...The Modern Development of Atomic Theory According to Democritus, “Nothing exists except atoms and empty space; everything else is opinion.” This conveys the controversy in scientific investigations made in defining a singular molecule. Since 460 BC, atomism has been an alternating concept of chemistry. Several significant scientists have contributed to this field profoundly. The modern development of the atomic theory is based on researches and discoveries of Democritus, John Dalton, J.J. Thomson, Robert Andrews Milikan, Ernest Rutherford, James Chadwick, and Niels Bohr. Robinson, Bertsch, both Professors of Physics, and McGrayne, a science writer, wrote for Encyclopedia Britannica defining an atom as the “smallest unit into which matter can...
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...Modern Atomic Theory Worksheet 1. Draw and label the parts of a wave. 2. What are the types of waves given off by the sun and other stars? Which of the visible light waves are given off by the sun? How do we known this? (Hint: Have you ever seen a rainbow?) How are these waves different? 3. How are frequency (v) and wavelength (λ) related for a wave? 4. a. What is the wavelength of the scarlet red light waves reflected from Jennifer Lopez’s lipstick in the limelight if they have a frequency of 4.25 x 1014 sec -1? b. If she happened to be feeling blue and wore her indigo eyeliner that reflects light with a wavelength of 4.15 x 10-7 m in a dimly light lit alley, what would be the frequency? 5. Explain the difference between a continuous spectrum and a line-emission spectrum? 6. a. How did Max Planck explain the relationship between frequency and energy of electromagnetic radiation? What mathematical equation did he drive to describe this relationship? What is Planck’s constant equal to? b. “One” by the band U2, the number one song voted by the listeners of 91X in 1992, can still be heard broadcasted from the booster station XTRA (“equis,tay,eddie, ah…Baha, California, Mexico”) at least once a day in San Diego. What is the energy of these waves if they arrive here with a frequency of 1.35 x 1012 sec -1? 7. Erwin Schrödinger is a man of tremendous credit...
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...Democritus . 460 – c. 370 BCE) was an Ancient Greek philosopher born in Abdera, Thrace, Greece.[1] A pupil of Leucippus, he was an influential pre-Socratic philosopher who formulated an atomic theory for the universe.[2] he theory of Democritus and Leucippus held that everything is composed of "atoms", which are physically, but not geometrically, indivisible; that between atoms, there lies empty space; that atoms are indestructible; have always been, and always will be, in motion; that there are an infinite number of atoms, and kinds of atoms, which differ in shape, and size. Of the mass of atoms, Democritus said "The more any indivisible exceeds, the heavier it is." But his exact position on weight of atoms is disputed.[1] Leucippus is widely credited with being the first to develop the theory of atomism, although Isaac Newton preferred to credit the obscure Mochus the Phoenician (whom he believed to be the biblical Moses) as the inventor of the idea on the authority of Posidonius and Strabo.[26] The Stanford Encyclopedia of Philosophy notes, "This theologically motivated view does not seem to claim much historical evidence, however."[27] Democritus, along with Leucippus and Epicurus, proposed the earliest views on the shapes and connectivity of atoms. They reasoned that the solidness of the material corresponded to the shape of the atoms involved. Thus, iron atoms are solid and strong with hooks that lock them into a solid; water atoms are smooth and slippery; salt atoms...
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...There are five scientists who helped shape not only atomic theory but also our perspective of the atom. Dalton, Bohr, Rutherford, Planck, and Millikan, each of these scientists contributed to atomic theory in their own way and enhanced our knowledge of the atom. John Dalton is known for his work of gas laws (i.e. Dalton’s law) but also his work to lay the ground work for atomic theory. In the year 1800 Dalton presented a paper which was on the constitution of mixed gasses. This would lead him to develop his gas law and also affect others, such as Charles and Gay-Lussac. This research would also lead him to research atomic weights, which lead to his contribution in 1805. Dalton theorized that elements are made of extremely small particles called atoms. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass and other properties. Atoms cannot be subdivided, created, or destroyed. Atoms of different elements combine in simple whole-number ratios to form chemical compounds. In chemical reactions, atoms are...
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...Atoms. How did the atomic Theory come about and evolve? Who came up with the atomic theory? What math is involved? The first person to come up with anything close to the atomic theory was Democritus, an ancient greek philosopher who proposed the existence of an ‘Ultimate Particle’ that was indivisible, thus bringing about the concept of the Atomic Theory. This was expounded upon the thoughts and ideas of other future scientists including: Antoine Lavoisier who discovered the Law of Conservation of Matter by experimentation. Joseph Proust who found that compounds always contain the same proportion, by mass, of elements which is now called The Law of Constant Composition. John Dalton came up with a theory with four major points being One, Elements are composed of small particles called...
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...Atomic structure was originally devised by ancient Greek philosophers; However over recent years this theory has been modified and changed by many different scientists, such as Dalton, Thompson, Rutherford, Bohr and Chadwick. In 1808 John Dalton in his book “new systems of chemical philosophy.” Proposed that elements are composed of many discrete and invisible particles which are called atoms, atoms of the same element have identical properties and atoms of different elements have different properties. Compounds are composed of atoms of more than one element and also that a chemical reaction involves the separation, combining or rearranging of atoms. He was also responsible for part of the periodic table, as it was he who introduced the idea of chemical symbols, being the first to discover carbon dioxide. In the late 1800s and early 1900s J. J. Thomson conducted some experiments that did not agree with Dalton’s earlier atomic theory. He performed experiments using a Cathode ray tube. He conducted electricity through gases, causing a glow to be seen at the furthest end of the cathode tube. This proved that cathode rays must be made of something which has a negative charge. Thomson then concluded that atoms have tiny particles inside them called electrons which have a negative charge. He knew that on the whole atoms were neutral, so he came up with a theory that there must be a positive charge within the atom which would balance out the charge of the negative electrons. He suggested...
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...Name Lab Section Date The Mole Concept and Atomic Weights Text Reference: Tro, Chemistry: Structure and Properties Section 2.8 - Atoms and the Mole: How Many Particles? Section 1.9 – Atomic Mass: The Average of an Element’s Atoms The purpose of this activity is to better understand the concepts of relative atomic mass, counting by weighing and the mole. Per cent composition and average atomic mass are included. Part I. Relative Atomic Masses and the Mole – Early Method When John Dalton proposed his atomic theory, he stated that the atoms of each element had a characteristic mass. He carried out experiments to determine the relative atomic mass of each element. To do this, he had to establish a standard because a single atom was too small to weigh. The standard he chose was that the mass of hydrogen would be set equal to 1.000. In a simple experiment, Dalton would measure the grams of an element such as sulfur that reacted with 1.00 gram of hydrogen. For sulfur, the reacting mass was found to be 32.0 grams, and so 32.0 was the relative mass of sulfur with respect to the standard hydrogen. (Note: The current standard for atomic mass is the most abundant isotope of carbon, C-12, with an assigned mass of exactly 12.000 amu.) The following activity will demonstrate how the relative mass method works. 1. Weigh five of the red color balls to three decimal places. Be sure to tare out the mass of the plastic cup. Record the mass in the table below. 2. Weigh five...
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...Through the years, the AFP Intelligence Community (AFPIC) has strived to become a highly capable, dynamic and unified military institution committed to excellence in providing timely, accurate and relevant intelligence at all levels of Command for the accomplishment of the AFP Mission. In pursuit of this goal, the AFPIC recognizes the need to gain the trust and support of our people, for Intelligence is in itself ‘about people and the study of people’. It is imperative for them to know that military intelligence personnel, in the performance of their inherent tasks, are governed by rules and procedures that would ensure the protection of human rights and civil liberties. The Office of the Deputy Chief of Staff for Intelligence J2 is publishing this “Human Rights-Based Intelligence Operations Guidebook (Rules of Behavior for Military Intelligence Personnel)” with this objective in mind, to broaden the public’s understanding of our mission and challenges, and to help us become better and stronger partners committed to serve and defend our country. Designed to further harmonize all intelligence operations with the principles of human rights and International Humanitarian Law (IHL), this Guidebook is one of the contributions of the AFPIC to the Internal Peace and Security Plan (IPSP) “Bayanihan” of the AFP and to the Security Sector Reform Agenda of the Commanderin-Chief, President Benigno S Aquino III. The essential characteristics of this Guidebook...
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...notes will be permitted; calculators are permitted but must not connect to the internet or to outside sources of information. A periodic table with atomic numbers and atomic masses will be provided. There will be 26 questions: most multiple choice but some short answer and some calculations. You will be required to know the material and how to apply that knowledge. You will be expected to know basic conversion factors (grams –pounds, cm – in., ft – in., temp conversion equations, meanings of prefixes: milli-, centi-, kilo-, mega-, etc, but not the rarer ones). Other required conversion info will be provided (specific heats, etc.). No nomenclature on this exam. Topics and concepts to be covered: (Textbook: Chapt 1, 2, 3, 4, 10(pp288-302), 11.) Scientific method Significant figures, calculations, and scientific notation Unit conversions – temp., mass, length, volume, area, time Density; calculation of and uses of Physical and Chemical properties Physical and Chemical changes Qualitative vs quantitative observations and measurements Conservation of mass and energy Heat/temperature relationships and conversions including temp increases/decreases; heat absorbed/ released; specific heat computations; phase changes Atomic theory/atomic and electronic structures of atoms and elements; ions and ionic charges Sub-atomic particles Periodic table: what it is, uses, information contained in it Names of certain groups (columns) in the periodic table (covered in class) ...
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...VASILEIOS-MARIOS GKORTSAS vasilisg@mit.edu 6.638 Term Paper Attosecond Pulse Generation Abstract: The word “attosecond” (1 as = 10-18 sec) entered the vocabulary of physics when sub-femtosecond pulses of UV/XUV light were established. High harmonic generation (HHG) is currently the only experimentally proven method for generating attosecond pulses. Attosecond science has opened the door to real-time observation and time-domain control of atomic-scale electron dynamics. In this work, we review the essentials of the generation of attosecond pulses and we mention the applications of attosecond science in the control of electronic motion. 1. Introduction The need for finer time resolution and the quest for higher peak power explain the continuous trend towards shorter laser pulses since the invention of the laser. The historical progress of ultra-short technology is summarized in Figure 1. The first pulse lasers had duration of several hundreds of microseconds. The invention of Q-switching (Hellwarth, 1961) reduced the pulse length to 10 ns (four orders of magnitude decrease). The invention of laser mode locking (DiDomenico, 1964; Hargrove et al., 1964; Siegman, 1970) accompanied by broad gain laser media (Shank and Ippen 1974) further reduced the duration to less than 1 ps (another four orders of magnitude decrease). The ring cavity with intra-cavity prism compensation of the group velocity dispersion produced pulses of 6 fs (Fork et al, 1987)...
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...|Democritus |"by convention bitter, by convention sweet, but in reality atoms and void" | | |1704 |Isaac Newton |Proposed a mechanical universe with small solid masses in motion. | |1803 |John Dalton |Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass. | |1832 |Michael Faraday |Studied the effect of electricity on solutions, coined term "electrolysis" as a splitting of molecules with electricity, | | | |developed laws of electrolysis. Faraday himself was not a proponent of atomism. | |1859 |J. Plucker |Built one of the first gas discharge tubes ("cathode ray tube"). | |1869 |Dmitri Mendeleev |Arranged elements into 7 groups with similar properties. He discovered that the properties of elements "were periodic | | | |functions of the their atomic weights". This became known as the Periodic Law. | |1873 |James Clerk Maxwell |Proposed electric and magnetic fields filled the void. | |1879 |Sir William Crookes |Discovered...
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...Postulates of Dalton’s Atomic Theory The main points of Dalton’s atomic theory, an explanation of the structure of matter in terms of different combinations of very small particles, are given by the following postulates: 1. All matter is composed of indivisible atoms. An atom is an extremely small particle of matter that retains its identity during chemical reactions. 2. An element is a type of matter composed of only one kind of atom, each atom of a given kind having the same properties. Mass is one such property. Thus, the atoms of a given element have a characteristic mass. 3. A compound is a type of matter composed of atoms of two or more elements chemically combined in fixed proportions. The relative numbers of any two kinds of atoms in a compound occur in simple ratios. Water, for example, a compound of the elements hydrogen and oxygen, consists of hydrogen and oxygen atoms in the ratio of 2 to 1. 4. A chemical reaction consists of the rearrangement of the atoms present in the reacting substances to give new chemical combinations present in the substances formed by the reaction. Atoms are not created, destroyed, or broken into smaller particles by any chemical reaction. Main Points of the Bohr Model Postulate 1: An electron in an atom moves in a circular orbit under the influence of coulomb attraction between the electron and the nucleus obeying the rules of classical mechanics. Postulate 2: An atom can exist in certain allowed or stationary states, with each...
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...CHM 1101 Introductory Chemistry Dawn Fox Medeba Uzzi August, 2007 Compiled and edited by Medeba Uzzi Authors’ Note This document is an initiative by the authors in an attempt to deal with what they think may be one of the reasons contributing to the relatively high failure rate in the introductory Chemistry course (CHM 1101) at the University of Guyana. It was brought to our attention that many first year students taking CHM 1101 are unable to efficiently cope with the frenetic pace of the Semester system and even less able to deal comprehensively with the large content in CHM 1101. It is hoped that by providing this paper, students will not need to make lots of notes in lectures and so they can focus on grasping the concepts taught. The document is meant to be a guide to the topics covered in CHM 1101 and is by no means exhaustive. Students are still required to attend classes regularly and punctually and to engage meaningfully in lectures and tutorials. Further, supplemental reading of these topics in any good General Chemistry text is expected. Dawn Fox Medeba Uzzi 2 SECTION 1 – Modules A – D: section deals with the foundation for chemistry. It introduces students to matter & its classification, Atom & its structure, Periodic table and chemical rxns. Introduction to Science and Measurement What is Chemistry? – Chemistry is the study of matter and its transformations Natural sciences refer to the systematic study of the natural world (our...
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