Equation: MgOH2 (s) --> MgO (s) + H2O (g)
And it's already balanced.
I had chemistry this semester too. 
        
                    
             
        
        
        
Na₂CrO₄ + PbCl₂ → PbCrO₄ + 2 NaCl
<u>Explanation:</u>
In a double displacement reaction, the reactants which are involved in the reaction exchanging their ions thereby produces 2 new compounds. Here sodium chromate and lead chloride are undergoing double displacement reaction, the ions exchanges their position there by forming sodium chloride and lead chromate. So the double displacement reaction is given as,
Na₂CrO₄ + PbCl₂ → PbCrO₄ + 2 NaCl
 
        
             
        
        
        
The region where an electron is most likely to be is called an orbital
        
             
        
        
        
Activation of energy is the foundation of chemical being react in a solution. If activation energy is not reached then no reaction would happen.
        
             
        
        
        
The heat energy needed is 2928800J. Mass is given as 20 (kg)