Exercice 33, Sondage de rails : 1. Citer les transformations physiques et les trans-
formations chimiques évoquées dans le doc. 1.
2. Le procédé met en jeu deux réactions dont les
équations sont :
1 2 Mg + 02—2 Mgo (allumage de la mèche)
2 Fe2O3 + 2 Al G2 Fe + Al203 (soudure)
Attribuer un nom à chacun des éléments chimiques
repérés en gras dans les équations de réaction.
Livret fiche 13
3. a. Quel est le métal formé qui vient combler l'es-
pace entre les rails?
b. Justifier que ce métal est à l'état liquide.
Donnée :
Température fusion du fer : Trus(Fe) = 1 538 °C.

3.) for each of the following compounds, draw the major organic product of reaction with hcl or naoh and circle whether the starting materials and products will be more soluble in organic solvent or water benzoic acid + hcl: benzoic acid + naoh: oh benzoic acid water/organic water organic fluorenone hс: fluorenone + naoh: fluorenone water/organic water/organic веnzocaine + hci: benzocaine + n»oh: h2n benzocaine water/organic water organic o=

How do temperature and salinity affect deepwater currents? as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.

Find the mass, in grams, of 5.00*10^23 molecules of f2