Answer:
Second one
Explanation:
I think it's the second cause there's no energy w/o heat. So it's the second.
Answer: In the first paragraph, name a theme of Paul Laurence Dunbar's poem "Sympathy," and explain how it develops, citing specific examples
Explanation:
Answer:
C.) HOCl Ka=3.5x10^-8
Explanation:
In order to a construct a buffer of pH= 7.0 we need to find the pKa values of all the acids given below
we Know that
pKa= -log(Ka)
therefore
A) pKa of HClO2 = -log(1.2 x 10^-2)
=1.9208
B) similarly PKa of HF= -log(7.2 x 1 0^-4)= 2.7644
C) pKa of HOCl= -log(3.5 x 1 0^-8)= 7.45
D) pKa of HCN = -log(4 x 1 0^-10)= 9.3979
If we consider the Henderson- Hasselbalch equation for the calculation of the pH of the buffer solution
The weak acid for making the buffer must have a pKa value near to the desired pH of the weak acid.
So, near to value, pH=7.0. , the only option is HOCl whose pKa value is 7.45.
Hence, HOCl will be chosen for buffer construction.
Answer: The specific heat of the Al is .
Explanation:
As we know that,
where,
= mass of water = 87.4 g
= mass of Al metal = 6.7797 g
= final temperature =
= temperature of water =
= temperature of Al metal =
= specific heat of water =
= specific heat of Al metal = ?
Now put all the given values in equation (1), we get
Therefore, the specific heat of the Al is .
<span>According to modern atomic theory, electrons can't move from one energy
level to another. It is not that it cannot really move but electrons tend to stay at a level with the lowest energy possible. Hope this answers the question. Have a nice day.</span>