Answer is none of the above
        
             
        
        
        
A physical property is what a substance is like; it's directly observable. On the other hand, a chemical property is how a substance behaves; its reactivity.
Examples of a physical property are: color, texture, boiling point, freezing point, and melting point.
Examples of a chemical property are: flammability, combustion, and formation of a precipitate.
        
             
        
        
        
Nitrogen trichloride is the name of this compound
        
             
        
        
        
Yes! You're correct! Hope this helps! :D
        
             
        
        
        
Answer:
16
Explanation:
4 nitrogen (N) atoms and 12 (3×4) atoms in Hydrogen (H)
Total = 4 + 12 = 16 molecules