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The measures with the sextant

measures with a sextant
09/06/2010
h. 13:25
height alone group (°) difference (°)
1 77
2 10.7 85 18.7
3 75 8.7
4
5 75 8.7 62
-4.3 6 72 5.7
media 74.3 °

value Observatory of San Marino 66.3 °

Summary data and comparison with those of the observatory of San Marino for the same date and same time:

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Electrolysis

In 'Today we did another experiment in these two tests:

Circuit 1: battery, electrodes (two spikes), water, light bulb. Connects the various components and note that the bulb is off.

Circuit 2: battery, electrodes (two spikes), water, NaCl (two teaspoons) light bulb. As above, but add the salt water. The bulb lights up. In the first case, circulating current in the second yes.

What happened? Because the salt increased the conductivity of the water?

The salt is made up of molecules of sodium chloride (NaCl).

Water also divides each molecule in the two atoms that constitute, in ^{two ions Na + and Cl -} . The molecules of salts, acids and bases dissolved in water, ionize, dissociate that particles of opposite charge. Na + and Cl ^- made conductive distilled water.
A conductive solution is also defined electrolyte. Not only water but other liquids are capable to ionize substances that are dissolved.
Do the same test, using a acid, such as vinegar. And he used the

sugar instead of salt work?
Compare also the conductivity of tap water than in distilled water.
comparison with solid and liquid conductors, you can see that while the current passes through a wire without carrying atoms or cause chemical reactions, the passage of current in an electrolyte is in the movement of ions and the electrodes we have chemical reactions. Among other things, these reactions tend to run out of batteries.
L ' electrolysis (meaning "to break with electricity") is a process that transforms electrical energy into chemical energy . Water, for the passage of current, breaks down into oxygen and hydrogen gases. is the reverse process to that of the pile : with the battery because it uses a chemical reaction to produce electricity, but with electrolysis using the electricity to run a chemical reaction that would not occur spontaneously. The device in which it occurs is called electrolysis electrolytic cell. An electrolytic cell is achieved by immersing the reaction in the two electrodes connected to a current source continuous (the battery). In this way the two electrodes assume opposite charges of equal sign to the poles of the battery.
The electricity splits the water molecule. Hydrogen is the cathode (the electrode - from which the electrons are put in the water), while the anode (+ electrode, in which the electrons are absorbed from the water) oxygen is developed. A movie
electrolysis carried out with sulfuric acid, which shows how well you collect hydrogen and oxygen respectively to the cathode and anode can be seen here .

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pickling?

Once there was a sixth plant Falck Pickling . What were they doing there? Click on photo to enlarge it and read the article published in the journal of the City.



We talked about it because of our little experiment electroplating, which is to deposit a metal on a thin layer of another metal.
The liquid solution in which case the process of electroplating is called galvanic . This solution is typically made of metal and salt water (for us, copper sulphate) to be deposited. The electrodes are elements of conductive material immersed in the solution that will allow the current electricity to flow through the solution. The electrode connected to the negative terminal of the battery is called cathode and is formed from the object to be coated (-). The electrode connected to the positive terminal of the battery is said anode, and can be made of the same metal that you want to submit the object to be coated, or another metal or graphite.


The zinc coating can be achieved for small items or large structures, such as car bodies. The plating baths may have very low or very high concentrations, while currents range from milliamps for small items, to many amps for large plating baths.
The surface to be coated must be completely clean. Impurities in fact do not allow the metal to settle and adhere to the object. This operation is called pickling . It makes a mechanical cleaning with metal brushes or abrasive pads followed by a chemical cleaning. Are immersed in the plating bath cathode (-) , formed from the object to be covered (we have it directly connected to - terminal of the battery), el ' anode (+) , formed by another object conductor. The two electrodes are connected to a generator. When you turn on the generator, the current begins to flow through the electrodes and the solution, and the metal begins to settle. After
electroplating, the object must be washed to remove residues of the plating bath.

are immersed in the plating bath to the cathode (-), formed from the object to be filled, and the anode (+), formed by another conducting object. The two electrodes are connected to a generator. When you turn on the generator, the current begins to flow through the electrodes and the solution, and the metal begins to settle.
After electroplating, the object must be washed to remove residues of the plating bath.