Clasified in Notes of Chemistry of Secondary.
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Clasified in Homeworks of Chemistry of Secondary.
Written at November 25, 2009 on English with a size of 15779 bytes.
Atoms bond to each other giving, taking or sharing electrons in order to complete their outer shells (to resemble the nearest noble gas structure).
A MIXTURE IS A SYSTEM FORMED BY TWO OR MORE SUBSTANCES THAT ARE NOT CHEMICALLY UNITED. ELEMENTS IF ALL ATOMS FORMING EACH PARTICLE BELONG TO THE SAME CLASS. COMPOUNDS IF PARTICLES ARE FORMED BY ATOMS OF DIFFERENT ELEMENTS. PURE SUBSTANCE: A SYSTEM IN WHICH ALL THE PARTICLES ARE EQUAL.
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Clasified in Notes of Chemistry of Bachelor.
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Clasified in Notes of Chemistry of Secondary.
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Dalton: tiny solid sphere.
JJ Thomson: sphere (t), had electrons ( - )
Nagoaka: central nucleus.
Rutherford: nucleus, electrons around nuc.
Bohr: electrons in circular orbit.
Broglie: electrons have properties of waves
Schrodinger: electron cloud model.
Chadwick: neutrons (no charge),protons (t)
Quantom: amount of energy required to move an electron from one level to another
The Quantum Model: determines the allowed energies an electron can have and how likely it is to found the electron in various locations around the nucleus.
Atomic Orbital: region of space in which there is high probability of finding an electron.
Electron Configurations: the way in which electrons are arranged into various orbitals around the nuclei of atoms.
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58. Como funciona a CIR Committed Information Rate na tecnologia Frame Relay?
59. Quais são os componentes constituintes de uma rede Frame Relay?
60. Descreva o fluxo das informações dentro da rede Frame Relay incluindo: como a rede FR age
nas condições de congestionamento e na ocorrência de erros nos pacotes recebidos.
62. Descreva o protocolo ATM Asynchronous Transfer Mode (Modo de Transferência
Assíncrona).
63. Quais as vantagens ao uso da tecnologia ATM?
81. O que são redes sem fio (Wireless)?
82. Qual é a classificação das redes wireless?
83. O que são redes WPAN? Exemplifique.
86. O que é uma PICONET?
98. O que é criptografia?
99. Quais são os tipos de criptografia usuais?
Clasified in Notes of Chemistry of Secondary.
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Free fall: all objects moving under the influence of only gravity are said to be in free fall. Position: is defined in terms of a frame of reference.Displacement measures the change in position.Ax or Ay.Motion: is relative,describe changes over time, 3 quantities to describe motion: velocity, speed & acceleration. Is the movement of an object from one place to other, measured over a time such as s, min.. relative to the position of the observer or the reference point. Average speed: total distance / total time. Scalars: are quantities which are fully described by a magnitude ( or numerical value) alone. Vector: are quantities which are fully described by both a magnitude and a direction.
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Clasified in Notes of Chemistry of Primary.
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Kalamake was the wizard of Molokai: he could see into the furure with the help of evil spirits. Everyone in the kingdom of Hawaii went to ask for his advice nd everyone was afraid of him.His enemies died in terrible ways.At night he was seen in the high mountains, moving from one mountain to the other.
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Clasified in Notes of Chemistry of Secondary.
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mol/mol:H2S+2Na(OH)---SNa2+2H2O(moles de sulfuro de sodio a partia de 12 de acido) 1mol de H2S--------- 1 mol de sal, 12 moles de H2S------- x moles de sal (12)
mol/g: H2S+2Ag(OH)-----SAg2+2H2O(g de plata con 10 moles de acido)
1mol de H2S-----1 mol de SAg2, 10 moles de H2S-----x moles deSAg2(10)
1 mol de SAg2. S por 1=32 por 1=32, Ag por 2=108 por 2=216, 216+32=248g
248por 10
Metales: en la natu:minerales:ganga:parte del minetal q no tiene valor, mena:parte del mineral q contiene el metal. raparacion y obtencion de metal puro: metalurgia. Arrabio:metal obtenido q sale del horno junto con algunas impurezas, Ecoria:constituida por el silicto de calsio q sale por otra de las salidas del horno.
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