Wednesday, July 7, 2010
Democritus
GROUP 9
Members:
Uson
Silang
Sysantos
Suk
------------------------
Democritus
He was an influential pre-Socratic philipsopher who formulated the atomic theory for the cosmos.
Members:
Uson
Silang
Sysantos
Suk
------------------------
Democritus
Democritus was born at Abdera, Thrace, sometime around 458 BCE. He was described as well traveled, probably visitng Babylon, Egypt, and Ethiopia, and perhaps India. he appears to have spent all of his time on scientific and philosopical studies, teachings, and writing- some 60 works have been listed. Democritus' Theory of the atomic nature of the physcial world, developed from that of Leucippus, is known only through the works of critics of the theory such as Arisitotle and Theoprastus.
He was an influential pre-Socratic philipsopher who formulated the atomic theory for the cosmos.
Democritus' Theory
He hypothesized that all matter is composed of tine indestructable units , called atoms. The atoms itself remains. He also believed that all elements are made up of various imperishable, indivisible elements called Atoms.
Quantum Mechanical Model
Reyes
Roldan
Santiago
Sarmiento
----------
The History of Quantum Mechanics began with the 1838 discovery of cathode rays by Michael Faraday. The 1859 statement of the Black Body Radiation.
General Quatnum System
Single Particle in a Potential 
Following Max Planck's quantization of light (see black body radiation), Albert Einstein interpreted Planck's quantum to be photons, particles of light, and proposed that the energy of a photon is proportional to its frequency, one of the first signs of wave–particle duality. Since energy and momentum are related in the same way as frequency and wavenumber in special relativity, it followed that the momentum p of a photon is proportional to its wavenumber k.
The Schrödinger equation
** The Schrödinger equation takes several different forms, depending on the physical situation. This section presents the equation for the general case and for the simple case encountered in many textbooks.
Roldan
Santiago
Sarmiento
----------
Quantum Mechanical Model is the most recent model of the atom. It is based on quantum mechanics numbers are quantum solutions to quantum equations and are used to find probable position and location of an electron in an atom.The first Principal quantum number identifies which energy level in an electron is in. There are 7 possible energy levels in an atom in the ground state (stable) the azimuthal quantum number identifies the sub-level with in the energy level where the electron is most likely to be found.
The History of Quantum Mechanics began with the 1838 discovery of cathode rays by Michael Faraday. The 1859 statement of the Black Body Radiation. Schrondinger Equation:
Time Independent Equation
Following Max Planck's quantization of light (see black body radiation), Albert Einstein interpreted Planck's quantum to be photons, particles of light, and proposed that the energy of a photon is proportional to its frequency, one of the first signs of wave–particle duality. Since energy and momentum are related in the same way as frequency and wavenumber in special relativity, it followed that the momentum p of a photon is proportional to its wavenumber k.
The Schrödinger equation
** The Schrödinger equation takes several different forms, depending on the physical situation. This section presents the equation for the general case and for the simple case encountered in many textbooks.
Chemist-Joseph Proust Group 10
Chemistry studies
Proust’s largest accomplishment into the realm of science was disproving Berthollet with the law of definite proportions, which is sometimes also known as Proust's Law. Proust studied copper carbonate, the two tin oxides,and the two iron sulfides to prove this law. He did this by making artificial copper carbonate and comparing it to natural copper carbonate. With this he showed that each had the same proportion of weights between the three elements involved (Cu, C, O). Between the two types of the other compounds, Proust showed that no intermediate indeterminate compounds exist between them. Proust published this paper in 1794, but the law was not accepted until 1811, when the Swedish chemist Jöns Jacob Berzelius gave him credit for it.
There are, however, exceptions to the Law of Definite Proportions. An entire class of substances does not follow this rule. The compounds are called non-stoichiometric compounds, or Berthollides, after Berthollet. The ratio of the elements present in the compound can fluctuate within certain limits, such as in the example of Ferrous oxide. The ideal formula is FeO, but due to crystallographic vacancies it is reduced to about Fe0.95O.
Proust was also interested in studying the sugars that are present in sweet vegetables and fruits. In 1799, Proust demonstrated, to his class in Madrid, how the sugar in grapes is identical to that found in honey. This later became known as glucose. Overall, Proust discovered three types of sugar during his studies.
SOURCE: nyenye
Proust’s largest accomplishment into the realm of science was disproving Berthollet with the law of definite proportions, which is sometimes also known as Proust's Law. Proust studied copper carbonate, the two tin oxides,and the two iron sulfides to prove this law. He did this by making artificial copper carbonate and comparing it to natural copper carbonate. With this he showed that each had the same proportion of weights between the three elements involved (Cu, C, O). Between the two types of the other compounds, Proust showed that no intermediate indeterminate compounds exist between them. Proust published this paper in 1794, but the law was not accepted until 1811, when the Swedish chemist Jöns Jacob Berzelius gave him credit for it.
There are, however, exceptions to the Law of Definite Proportions. An entire class of substances does not follow this rule. The compounds are called non-stoichiometric compounds, or Berthollides, after Berthollet. The ratio of the elements present in the compound can fluctuate within certain limits, such as in the example of Ferrous oxide. The ideal formula is FeO, but due to crystallographic vacancies it is reduced to about Fe0.95O.
Proust was also interested in studying the sugars that are present in sweet vegetables and fruits. In 1799, Proust demonstrated, to his class in Madrid, how the sugar in grapes is identical to that found in honey. This later became known as glucose. Overall, Proust discovered three types of sugar during his studies.
SOURCE: nyenye
Group 6 - Earnest Rutherford
EARNEST RUTHERFORD
- died Oct. 19, 1937, Cambridge, Cambridgeshire
- was born on Aug. 30, 1871
- he moved to Britain to attend Cambridge University, where he worked with J.J. Thomson at the Cavendish Laboratory
Subscribe to:
Posts (Atom)