For each reaction listed, determine its standard cell potential at 25 °C and whether the reaction is spontaneous at standard conditions. (a) Mn ( s ) + Ni 2 + ( a q ) → Mn 2 + ( a q ) + Ni ( s ) (b) 3Cu 2 + ( a q ) + 2 Al ( s ) → 2 Al 3 + ( a q ) + 3 Cu ( s ) (c) Na ( s ) + LiNO 3 ( a q ) → NaNO 3 ( a q ) + Li ( s ) (d) Ca ( NO 3 ) 2 ( a q ) + Ba ( s ) → Ba ( NO 3 ) 2 ( a q ) + Ca ( s )
For each reaction listed, determine its standard cell potential at 25 °C and whether the reaction is spontaneous at standard conditions. (a) Mn ( s ) + Ni 2 + ( a q ) → Mn 2 + ( a q ) + Ni ( s ) (b) 3Cu 2 + ( a q ) + 2 Al ( s ) → 2 Al 3 + ( a q ) + 3 Cu ( s ) (c) Na ( s ) + LiNO 3 ( a q ) → NaNO 3 ( a q ) + Li ( s ) (d) Ca ( NO 3 ) 2 ( a q ) + Ba ( s ) → Ba ( NO 3 ) 2 ( a q ) + Ca ( s )
A complete tensile test was performed on a magnesium
specimen of 12 mm diameter and 30 mm length, until breaking.
The specimen is assumed to maintain a constant volume.
Calculate the approximate value of the actual stress at breaking.
TABLE. The tensile force F and the length of the specimen are
represented for each L until breaking.
F/N
L/mm
0
30,0000
30,0296
5000
10000 30,0592
15000 30,0888
20000
30,15
25000 30,51
26500
30,90
27000
31,50
26500
32,10
25000 32,79
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell