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  • Updated 6 months ago - 1,775 words
    A good example is K + . The membrane is very permeable to K + and the [K + ] inside the cell is great, therefore a positive charge is flowing out of the cell along with K + . The [K + ] inside the cell decreases causing the concentration gradient to flow towards the outside of the cell.
    http://chemwiki.ucdavis.edu/Analytical_Chemistry/Electrochemistry/Case_Studies/Membrane_Potentials
  • Updated 6 months ago - 1,357 words
    Direct Methanol Fuel Cells (DMFC): This fuel cell is similar to the Proton Exchange Membrane Fuel Cell; however, instead of using gaseous hydrogen as the fuel, liquid methanol is used. Explanation: As explained by the table in the 'Different Types of Fuel Cells' section, the Solid Oxide Fuel Cell (SOFC) is the most efficient with an efficiency of 50-65%.
    http://chemwiki.ucdavis.edu/Analytical_Chemistry/Electrochemistry/Case_Studies/Case_Study%3A_Fuel_Cells
  • Updated 6 months ago - 791 words
    The International System of Units (SI) is system of units of measurements that is widely used all over the world. A set unit of prefixes have been established and are known as the SI prefixes or the metric prefixes (or units). Since the SI Units are nearly globally though, the scientific and mathematical field will use these SI units in order to provide ease between the sharing data with one another because of a common set of measurements.
    http://chemwiki.ucdavis.edu/Analytical_Chemistry/Quantifying_Nature/Units_of_Measure/SI_Units
  • Updated 6 months ago - 10 words
    Contributors Thomas Chasteen, Department of Chemistry, Sam Houston State University
    http://chemwiki.ucdavis.edu/Analytical_Chemistry/Instrumental_Analysis/Spectrometer/Detectors/Photomultiplier_Tube%3A_Shockwave
  • Updated 6 months ago - 760 words
    The sacrificial anode will be consumed in place of the metal it is protecting, which is why it is referred to as a "sacrificial" anode. The addition of zinc, a sacrificial anode, would prevent the iron metal from "corroding". According to the table of Standard Reduction Potentials, the standard reduction potential of zinc is about -0.76 volts. The oxidation reactions are transferred from the metal surface to the galvanic anode and will be sacrificed in favor of the protected metal structure.
    http://chemwiki.ucdavis.edu/Analytical_Chemistry/Electrochemistry/Case_Studies/Corrosion/Sacrificial_Anode
  • Updated 6 months ago - 2,253 words
    Therefore, the only solid we are left with is the pure solid copper plate at the cathode, which has a purity level of about 99.999%. The image below gives an outline about the fate of the main components of an impure iron ore. As we can see, due to the very much more negative electrode potential, the reduction of Sodium ions is much less likely to occur than the reduction of Water, so we can assume that that in the electrolysis of NaCl, the reduction that occurs is reaction (2).
    http://chemwiki.ucdavis.edu/Analytical_Chemistry/Electrochemistry/Case_Studies/Case_Study%3A_Industrial_Electrolysis
  • Updated 6 months ago - 1,448 words
    These hydrogen and hydronium ions then get close enough to the Pt electrode (on the platinized surface of this electrode) to where a hydrogen is attracted to the electrons in the metal and forms a hydrogen atom. It is necessary to have the solution saturated because this allows for the activity to be fixed by the potassium chloride and the voltage to be lower and closer to the SHE.
    http://chemwiki.ucdavis.edu/Analytical_Chemistry/Electrochemistry/Electrodes/Standard_Hydrogen_Electrode
  • Updated 6 months ago - 1,253 words
    The axle in question fractured because it was smaller than the design’s requirement; because of the incorrect size, the gap between the bearing and the axle was over 1mm – when it should have been a mere 0.2mm (to picture this, imagine that the gap is the thickness of a dime, compared to what it's supposed to be, the thickness of two sheets of common printer paper.) The accumulation of excess vibration and stress eventually caused it to break.
    http://chemwiki.ucdavis.edu/Analytical_Chemistry/Quantifying_Nature/Case_Studies%3A_Metric%2F%2FEnglish_Conversion_Errors
  • Updated 6 months ago - 8 words
    Internal Links Dimensional Analysis WorkSheet Dimensional Analysis WorkShop
    http://chemwiki.ucdavis.edu/Analytical_Chemistry/Quantifying_Nature/Dimensional_Analysis
  • Updated 6 months ago - 1,487 words
    The reason for rounding a number to a particular amount of significant digits is because in a calculation, some values have less significant digits than other values, and the answer to a calculation is only accurate to the amount of significant digits of the value with the least amount.
    http://chemwiki.ucdavis.edu/Analytical_Chemistry/Quantifying_Nature/Significant_Digits
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