Answer:
Counterclockwise
explanation in attachment
 
        
             
        
        
        
Answer:
3 electrons from nitrogen and 3 from carbon while carbon already has a lone pair along with a negative charge (called cyanide)
 
        
             
        
        
        
For an atom to achieve a stable electron configuration, it needs 8 valence electrons. Since this atom has 6 valence electrons, it needs 2 more to achieve a stable electron configuration.
8-6=2
        
             
        
        
        
C :) cause a direction has nothing do do with velocity ! 
        
                    
             
        
        
        
Answer:
The flow area at the location where the Mach number is 0.9 is 25.24 cm²
Explanation:
 Here we have for isentropic flow;

Where:
A = Area of flow = 36 cm²
M = Mach number at section of = 1.8
k = Specific heat ratio = 1.4
A* = Area at the throat
Therefore, plugging the values we get

Therefore, A* = 36/1.439 = 25.01769 cm²
Where the Mach number is 0.9, we have

Therefore A = 25.020× 1.009 = 25.24 cm²
The flow area at the location where the Mach number is 0.9 = 25.24 cm².