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Chemistry Lesson Plans #07 - Chemical Reactions
Chemistry Lesson Plans #07 - Chemical Reactions

... formula of a substance. Check each atom or polyatomic ion to be sure that the equation is balanced. Finally, make sure all the coefficients are in the lowest possible ratio that balances Sample Problems Hydrogen and oxygen react to form water. Write a balanced equation for this reaction. First, writ ...
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Dirac Electrons in Graphene

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... • The energy absorbed by an electron for it to move from its current energy level to a higher energy level is identical to the energy of the light emitted by the electron as it drops back to its original energy level. • The wavelengths of the spectral lines are characteristic of the element, and the ...
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Energy in SHM - Ryerson Department of Physics
Energy in SHM - Ryerson Department of Physics

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... for these elements today are very different from their accepted atomic masses at the time Döbereiner made his observations. Döbereiner also observed that strontium, calcium, and barium showed a gradual gradation in their properties, with the values of some of strontium’s properties being about midwa ...
Conservation Laws III - Department of Physics, HKU
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Wave Function of the Universe
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... sensible value for a closed universe. And solving it is just like looking for an eigenstate of any other Hamiltonian. Folks who have studied quantum mechanics have probably solved the "time-independent Schrodinger equation" in order to find the bound states of a hydrogen atom. It looks like this: H ...
Chapter 3 Approximation Methods in QM
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... degenerate PT, we need to use these |nlml sms i to diagonalize the perturbation operator V̂LS and to obtain the zero-order wavefunction and first-order energy correction. We have already done so in the previous chapter. The zeroth-order wavefunction are angular momentum states |nlsjmi which are eige ...
The concept of mass (mass, energy, relativity)
The concept of mass (mass, energy, relativity)

... Despite the unusual appearance of Eq. (7.3) from the point of view of Newtonian mechanics (we should say, rather, precisely because of this unusual appearance), this equation correctly describes the motion of relativistic particles. From the beginning of the century it was frequently submitted to ex ...
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Atomic theory



In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. It began as a philosophical concept in ancient Greece and entered the scientific mainstream in the early 19th century when discoveries in the field of chemistry showed that matter did indeed behave as if it were made up of atoms.The word atom comes from the Ancient Greek adjective atomos, meaning ""uncuttable"". 19th century chemists began using the term in connection with the growing number of irreducible chemical elements. While seemingly apropos, around the turn of the 20th century, through various experiments with electromagnetism and radioactivity, physicists discovered that the so-called ""uncuttable atom"" was actually a conglomerate of various subatomic particles (chiefly, electrons, protons and neutrons) which can exist separately from each other. In fact, in certain extreme environments, such as neutron stars, extreme temperature and pressure prevents atoms from existing at all. Since atoms were found to be divisible, physicists later invented the term ""elementary particles"" to describe the ""uncuttable"", though not indestructible, parts of an atom. The field of science which studies subatomic particles is particle physics, and it is in this field that physicists hope to discover the true fundamental nature of matter.
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