Answer: Option (c) is the correct answer.
Explanation:
A positron is denoted as
, a neutron is denoted as
, an electron is denoted as
, and a proton is denoted as
.
Therefore, when
will decay into
this means there occurs decrease in its mass number. Hence, it means a neutron will be releasing during this reaction.
The reaction will be as follows.
![^{219}Rn \rightarrow ^{218}Rn + ^{1}_{0}n](https://tex.z-dn.net/?f=%5E%7B219%7DRn%20%5Crightarrow%20%5E%7B218%7DRn%20%2B%20%5E%7B1%7D_%7B0%7Dn)
Answer:
![pH=13](https://tex.z-dn.net/?f=pH%3D13)
Explanation:
Hello,
In this case, given the acid, we can suppose a simple dissociation as:
![HA\rightleftharpoons H^+ + A^-](https://tex.z-dn.net/?f=HA%5Crightleftharpoons%20H%5E%2B%20%2B%20A%5E-)
Which occurs in aqueous phase, therefore, the law of mass action is written by:
![Ka=\frac{[H^+][A^-]}{[HA]}](https://tex.z-dn.net/?f=Ka%3D%5Cfrac%7B%5BH%5E%2B%5D%5BA%5E-%5D%7D%7B%5BHA%5D%7D)
That in terms of the change
due to the reaction's extent we can write:
![1x10^{-20}=\frac{x*x}{0.1M-x}](https://tex.z-dn.net/?f=1x10%5E%7B-20%7D%3D%5Cfrac%7Bx%2Ax%7D%7B0.1M-x%7D)
But we prefer to compute the Kb due to its exceptional weakness:
![Kb=\frac{Kw}{Ka}=\frac{1x10^{-14}}{1x10^{-20}} =1x10^{-6}](https://tex.z-dn.net/?f=Kb%3D%5Cfrac%7BKw%7D%7BKa%7D%3D%5Cfrac%7B1x10%5E%7B-14%7D%7D%7B1x10%5E%7B-20%7D%7D%20%20%3D1x10%5E%7B-6%7D)
Next, the acid dissociation in the presence of the base we have:
![Kb=\frac{[OH^-][HA]}{[A^-]}=1x10^{6}=\frac{x*x}{0.1-x}](https://tex.z-dn.net/?f=Kb%3D%5Cfrac%7B%5BOH%5E-%5D%5BHA%5D%7D%7B%5BA%5E-%5D%7D%3D1x10%5E%7B6%7D%3D%5Cfrac%7Bx%2Ax%7D%7B0.1-x%7D)
Whose solution is
which equals the concentration of hydroxyl in the solution, thus we compute the pOH:
![pOH=-log([OH^-])=-log(0.0999)=1](https://tex.z-dn.net/?f=pOH%3D-log%28%5BOH%5E-%5D%29%3D-log%280.0999%29%3D1)
Finally, since the maximum scale is 14, we can compute the pH by knowing the pOH:
![pH+pOH=14\\\\pH=14-pOH=14-1\\\\pH=13](https://tex.z-dn.net/?f=pH%2BpOH%3D14%5C%5C%5C%5CpH%3D14-pOH%3D14-1%5C%5C%5C%5CpH%3D13)
Regards.
answer: D
Here is a list of the most common ways to speed up a chemical reaction
Increase the temperature (reactions that absorb energy)
Decrease the temperature (Reactions that release energy)
Answer:
Strongest intermolecular force
Hydrogen Bonding (H-Bonding)
Hydrogen bonds are caused by highly electronegative atoms. They only occur between hydrogen and oxygen, fluorine or nitrogen, and are the strongest intermolecular force.