Answer:
Following are the responses to the given choices:
Explanation:
For point a:
Using the acid and base which are strong so,
moles of 
(from
)
moles of 
(from 
)
So, 
i.e. 
mol of 
in excess in total volume 
i.e. concentration of 
![p[OH^{-}] = -\log [OH^{-}] = -\log [2 \times 10^{-4}\ mol] = 3.70](https://tex.z-dn.net/?f=p%5BOH%5E%7B-%7D%5D%20%3D%20-%5Clog%20%5BOH%5E%7B-%7D%5D%20%3D%20-%5Clog%20%5B2%20%5Ctimes%2010%5E%7B-4%7D%5C%20mol%5D%20%3D%203.70)
Since, 
so,
For point b:
moles of = from point a 
moles of (from):
1 mol neutralizes 1 mol of
So, 
i.e. 
in excess in the total volume of 
i.e. concentration of
Hence, ![pH = -\log [H^+] = -\log[2 \times 10^{-4}] = 3.70](https://tex.z-dn.net/?f=pH%20%3D%20-%5Clog%20%5BH%5E%2B%5D%20%3D%20-%5Clog%5B2%20%5Ctimes%2010%5E%7B-4%7D%5D%20%3D%203.70)
Answer:
A) All the elements are composed of atoms.
d) Atoms cannot be created or destroyed in any chemical changes.
c) An atom of one element cannot be changed into an atom of a different element.
Explanation:
The main postulates of Dalton atomic theory was:
1) The matter is composed of atoms and atom is indivisible particle which can not be destroyed.
2) The atoms of an element are identical.
3) The atoms of different elements are combining with definite proportion and form compounds.
4) The atoms of different elements are different from each other.
5) During chemical reaction rearrangement of atoms occur and form new compounds.
Answer:
The exposure time that equals 750 is 3.4 hr
Explanation:
The given formula is:
![[tex]T=.0002*x^{2} -.316*x+127.9](https://tex.z-dn.net/?f=%5Btex%5DT%3D.0002%2Ax%5E%7B2%7D%20-.316%2Ax%2B127.9)
[/tex]
In the formula:
T= exposure time
x= carbon monoxide present in ppm
So, to calculate the exposure time when carbon monoxide is 750ppm, you should replace the "x" by 750.
![[tex]T=.0002*750^{2} -.316*750+127.9](https://tex.z-dn.net/?f=%5Btex%5DT%3D.0002%2A750%5E%7B2%7D%20-.316%2A750%2B127.9)
[/tex]
T=3.4hr
Answer: Neutral Value
Explanation: pH of the blood is maintained at 7.0 to 7.5that is neutral value.
This is because if the pH of the is lower than the maintained value then it will become acidic .
Acidic pH can cause the medical urgency known as acidosis leading to vomiting, diarrhea etc.
If the pH becomes higher, then the blood will become basic in nature and it can also leas to the death of the person.
That is why the pH of the blood is maintianed at neutral value of 7.0 to 7.5
Answer:
a) molarity of CCl3F = 1.12 × 10^-11 mol/dm³
Molarity of CCl2F2 = 2.20 × 10^-11 mol/dm³
B) molarity of CCL3F = 7.96 × 10 ^-13 mol/dm³
Molarity of CCl2F2 = 1.55 × 10^-12 mol/dm³
Explanation:
Using the ideal gas equation:
PV = nRT
Further explanations are found in the attachment below.
