Solution:
Given:
Calcium and Oxygen ions each having valence = 2 or 2 valence electrons
seperation distance, r = 1.25nm = 
m
Coulombian force for two point charges seperated by a distance 'r' is given by:
F = 
(1)
Now, we know that
q = ne
where, n = no. of electrons
e = charge of an electron = 
C
= 
e = 2e
= 
e = 2e
Using Eqn (1)
F = 
F = 
N
Since, the force is between two opposite charged ions, it is attractive in nature.
Answer:
0.667 per day.
Explanation:
Our values here are
Degradation constant=k and is unknown.
We calculate the concentration through the formula,
Replacing values we have
That is the degradation constant of Z-contaminant
Answer:
Machinist
Explanation:
A skilled worker with the ability to operate computer numerically controlled (CNC) machines is qualified to work in a machinist position.
A machinist is a person who is properly skilled and consists of advanced knowledge regarding the functions of a CNC machine. He can use different mechanisms and complex numerical functions of the machine to carry out different tasks. Any person who lacks the official learning of mechanisms cannot operate such machines effectively.
Answer:
the correct answer is option B. W
