Answer:
It is easy 
Explanation:
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That would be exothermic. Exothermic reactions are processes that release energy, usually in the form of heat or light. Energy is released because the total energy of the products is less than the total energy of the reactants.
        
                    
             
        
        
        
Answer:
The structure of the atom. 
Explanation:
The correct answer is - The structure of the atom. 
Reason -
An atom is the smallest unit of matter that retains all of the chemical properties of an element.
 
        
             
        
        
        
Answer is: adding NaCl will lower the freezing point of a solution.
A solution (in this example solution of sodium chloride) freezes at a lower temperature than does the pure solvent (deionized water). 
The higher the solute concentration (sodium chloride), freezing point depression of the solution will be greater.
Equation describing the change in freezing point:  
ΔT = Kf · b · i.
ΔT - temperature change from pure solvent to solution.
Kf - the molal freezing point depression constant.
b -  molality (moles of solute per kilogram of solvent).
i - Van’t Hoff Factor.
Dissociation of sodium chloride in water: NaCl(aq) →  Na⁺(aq) + Cl⁻(aq).
 
        
                    
             
        
        
        
Answer:
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