Redox potential – CV Acetonitrile Adjusted sensitivity Each ;line represents diff scan rates all been overlayed on one digarm Scan rates ranged from 0 .1 s-1 to 1 Peak due to iodide oxidation is read from +peak to – peak bottom line. Iodide to triiodide Glycol Didn’t work Using equation ip = 2.69 ×105 n3/2 A D1/2 C ν1/2 compare to linear equation y = mx+c y = peak current x = V1/2 c = zero Therefore m is = everything else C = concentration 0.05 M ethylene glycol (acetonitrile
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Trade Center and the Pentagon have caused confusion on the topic of patriotism. The best way to start understanding patriotism is to simply define it. Patriotism is a person’s level of loyalty toward their country. Displays of true patriotism are prominent in times of despair‚ such as wars and terrorist attacks. However‚ many people have discrepancies on what displays of patriotism really are. Some people believe that showing patriotism can be accomplished by waving the flag and singing the national
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60 m s–1 4. A steel wire is stretched and clamped between two fixed points that are spaced 1.0 m apart. Which of the following is closest to the fundamental wavelength that can exist on this wire? A B C D E 5. 0.25 m 0.50 m 1.0 m 2.0 m 4.0 m A thin converging lens of focal length 20 cm is used to shape light from a lamp filament into a parallel beam. Which of the following is closest to the required distance between the lamp filament and the lens? A B C D E 5.0 cm
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1 1 How‚ When and Where How Important are Dates? There was a time when historians were fascinated with dates. There were heated debates about the dates on which rulers were crowned or battles were fought. In the common-sense notion‚ history was synonymous with dates. You may have heard people say‚ “I find history boring because it is all about memorising dates.” Is such a conception true? History is certainly about changes that occur over time. It is about finding out how things were in the past
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Potential Energy • Definition and Mathematics of Work • Calculating the Amount of Work Done by Forces • Potential Energy • Kinetic Energy • Mechanical Energy • Power An object can store energy as the result of its position. For example‚ the heavy ball of a demolition machine is storing energy when it is held at an elevated position. This stored energy of position is referred to as potential energy. Similarly‚ a drawn bow is able to store energy as the result of its position. When assuming
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which cell has the larger resting membrane potential? Explain. If the permeability to K is higher in A than in B‚ then the resting membrane potential (rmp) will be closer to the equilibrium potential in cell A‚ which means the rmp will be more negative in cell A than in cell B; or in other words‚ the potential difference will be LARGER in cell A. 2. Predict the effect of a reduced extracellular concentration of Na+ on the magnitude of the action potential in an electrically excitable cell. If there
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The formation of an action potential can be divided into five steps. (1) A stimulus from a sensory cell or another neuron causes the target cell to depolarize toward the threshold potential. (2) If the threshold of excitation is reached‚ all Na+ channels open and the membrane depolarizes. (3) At the peak action potential‚ K+ channels open and K+ begins to leave the cell. At the same time‚ Na+ channels close. (4) The membrane becomes hyperpolarized as K+ ions continue to leave the cell. The
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Liberty Bell Authorizing the Liberty Bell Therefore‚ the Pennsylvania Assembly ordered the purchase of a new bell. The Assembly authorized Robert Charles‚ the Assembly’s London agent‚ to commission the casting of a bell weighing about 2‚000 pounds with inscription instructons provided by the Assembly. On November 1‚ 1751‚ Mr. Charles comissioned the White Chapel Bell Foundry to cast the bell. The colony paid about $300 for the bell. In 1732 constructon began on the State House (now called Independence
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The West’s universalist pretensions increasingly bring it into conflict with other civilizations‚ most seriously with Islam and China; at the local level fault line wars‚ largely between Muslims and non-Muslims‚ generate "kin-country rallying‚" the threat of broader escalation‚ and hence efforts by core states to halt these wars. it is undeniable that there is a very real conflict between the West and at least the Red Chinese and the Islamic world. But even this is deceptive. Islam is a special
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THE WORK DONE BY A CONSERVATIVE FORCE ALWAYS HAS FOUR PROPERTIES: 1. It can be expressed as the difference between the initial and final values of a potential-energy function. 3. It is independent of the path of the body and depends only on the starting and ending points. 2. It is reversible. 4. When the starting and ending points are the same‚ the total work is zero. The total mechanical energy ME = K + U is constant. Object moving in a uniform gravitational field gravitational a
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