3.11 i'm not sure about measurements  maybe like 3.11kg/cm^3
        
                    
             
        
        
        
Answer:
the atoms of the original substances gain, lose and even share their very own electrons. write the symbols of the elements that form the compound. Write down the valency, and lastly go over valencies. This is all I got so far. I hope this helps
Explanation: 
 
        
             
        
        
        
With the info given i would have to say their is no kinetic energy, it's all potential energy.
        
             
        
        
        
Answer:double displacement 
Explanation:I just did it