Answer:
Determining how many ozone molecules are lost in the atmosphere.
Explanation:
 
        
             
        
        
        
Answer:
As an example I can say sodium (Na) and chlorine (Cl). 
Explanation:
An ionic bond occurs when a metal element reacts with a nonmetal element. Therefore in the answer given above the Na is metal and Cl is nonmetal and they form a molecule through ionic bonding.
 
        
             
        
        
        
Answer:
473 year
Explanation:
Using integrated rate law for first order kinetics as:
![[A_t]=[A_0]e^{-kt}](https://tex.z-dn.net/?f=%5BA_t%5D%3D%5BA_0%5De%5E%7B-kt%7D) 
Where,  
![[A_t]](https://tex.z-dn.net/?f=%5BA_t%5D) is the concentration at time t
 is the concentration at time t
![[A_0]](https://tex.z-dn.net/?f=%5BA_0%5D) is the initial concentration
 is the initial concentration
Given:
To reach 12.5% of reactant means that 0.125 of ![[A_0]](https://tex.z-dn.net/?f=%5BA_0%5D) is decomposed. So,
 is decomposed. So,
![\frac {[A_t]}{[A_0]}](https://tex.z-dn.net/?f=%5Cfrac%20%7B%5BA_t%5D%7D%7B%5BA_0%5D%7D) = 0.125
 = 0.125
t = ?
![\frac {[A_t]}{[A_0]}=e^{-k\times t}](https://tex.z-dn.net/?f=%5Cfrac%20%7B%5BA_t%5D%7D%7B%5BA_0%5D%7D%3De%5E%7B-k%5Ctimes%20t%7D) 
 
t = 473 year
 
        
             
        
        
        
Li2O.. Because Li is +1 and O2 is -2