when sodium metal is dropped in water, hydrogen gas in liberated due to extreme heat released as the reaction is exothermic, gas catches fire.
 
        
             
        
        
        
Answer:
The mass of silicon in kilograms in Earth's crust is
.
Explanation:
Mass of Earth =
(1 ton= 2000 lb)
(1 lb =453.6 g)
1 ton = 2000 × 453.6 g =907,200 g
Mass of Earth =
Percentage of earth crust = 0.50%
Mass of earth crust = M


Percentage of the silicon in Earth's crust = 27.2 %
Mass of silicon in in Earth's crust = m



1000 g = 1 kg
The mass of silicon in kilograms in Earth's crust is
.
 
        
             
        
        
        
Answer:
Strongly acidic [or strongly basic] solution will have high conductivity.
Explanation:
 
        
                    
             
        
        
        
Answer:
Ionic
Explanation:
Sodium is Metal, Oxygen is Non-metal. Non-metals and metals are automatic Ionic bonds