30-Second Elements: The 50 most significant elements, each by Eric Scerri PDF

By Eric Scerri

ISBN-10: 184831616X

ISBN-13: 9781848316164

Whilst was once radium came across? who're Dmitri Mendeleev and Glenn T. Seaborg? Who found uranium’s radioactivity? Which point turns out to be useful for relationship the age of Earth? And why doesn’t gold have a systematic identify? 30-Second components offers you with the very foundations of chemical wisdom, explaining concisely the 50 most important chemical parts. This ebook makes use of precious glossaries and tables to quick song your wisdom of the opposite sixty eight parts and the relationships among them all.

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Extra info for 30-Second Elements: The 50 most significant elements, each explained in half a minute

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Y -.... 6 d c 0 2 4 6 8 10 12 14 pH o 2 4 6 8 10 12 14 pH Figure 10. Influence of the content in CO 2 total dissolved on the theoretical conditions of immunity, corrosion, and passivation of copper, at 25°C: (a) 10- 3 mol g liter-I; (b) 10- 2 mol g liter -1; (c) 10- 1 mol g liter-I; (d) 1 mol g liter-I. THERMODYNAMICS OF CORROSION 27 5. 1. General Statements Electrochemical behavior of metals, their oxides, hydroxides, and their ions in the presence of aqueous solutions at elevated temperatures has evoked considerable scientific and technological interest.

H er zero or h as t h e same sign mty. Pourb' alx (3 '" as a Iways elt established the equationt (E - Eo)i 2: 0 (39) This constitutes the mathematical expression of a second principle of electrochemical thermodynamics. Here, the difference (E - Eo) shows (in magnitude and sign) the affinity divided by n faradays, or the overpotential, '1/, of the considered reaction according to the equation A = A = n(E - Eo) volts (40) 23,061 n(E - Eo) calories (41) The intensity of the reaction current, i, measures the speed of the reaction, according to Faraday's law.

The classifications indicated in columns A and B of Table 1 can only be accepted with certain reservations because of the following: (i) Diagrams of binary electrochemical equilibria on which they are based will be improved with the development and refinement of knowledge in chemistry and thermodynamics. , Ni and Co), the thermodynamic data available are insufficient to consider the diagrams totally accurate. These two metals passivate more easily than their E-pH equilibria diagrams predict. (ii) Reaction of corrosion and passivation can be irreversible.

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30-Second Elements: The 50 most significant elements, each explained in half a minute by Eric Scerri


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