<em>How do air masses flow?</em>
<em>from regions of high pressure to low pressure</em>
.
In general, cold air masses tend to flow toward the equator and warm air masses tend to flow toward the poles.
Answer: 78.919 amu
Explanation:
If the natural abundance of Br-81 is 49.310%, then the natural abundance of Br-79 must be 100%-49.310%=50.690%
Substituting into the atomic mass formula,
Answer: C. Heat transfers thermal energy from the student's hand to the ice.
Explanation: It seems confusing; b and c seem to be saying the same thing, but the definition of heat is the transfer of thermal energy from a warmer object to a colder object.
Answer:
a) E = 0.477 V
b) E = 0.502 V
c) 0.02 M = [Ni+2]
d)[Zn+2] = 1.81 M
Explanation:
having the following reactions of each cell:
Zn =⇒ Zn+2 + 2e- +0.76
Ni+2 + 2e- =⇒ Ni -0.25
Zn + Ni+2 ==⇒ Ni + Zn+2 Eo = 0.51
a)
The number of electrons being transferred is 2, therefore n = 2 in the Nernst equation
E = Eo - 0.0592/2*log [Zn+2]/[Ni+2] = 0.51 - 0.0592/2*log[0.13/1.7] = 0.477 V
b)
using the formula above:
E = 0.51 - 0.0296*log [Zn+2]/[Ni+2] = 0.51 - 0.0296*log((0.13+0.5)/(1.7-0.5)) = 0.502 V
c)
using the formula above:
0.45 = 0.51 - 0.0296*log[Zn+2]/[Ni+2]
-0.06/-0.0296 = log[Zn+2]/[Ni+2]
2.02 = log [Zn+] / [Ni+2]
104.71 = [Zn+2] / [Ni+2]
x = change in [Ni+2]
[Ni+2] = 1.70 - x
[Zn+2] = 0.13 + x
0.13 + x/1.70 –x = 104.71
Resolving x:
x = 1.68 M
[Ni+2] = 1.70 - 1.68 = 0.02 M
d)
[Zn+2] = 0.13 + x = 0.13 + 1.68 = 1.81 M
