Its okay my friend. you dont need to over stress it.
        
                    
             
        
        
        
In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is equal to the heat of the reaction<span>. This is, the net energy released or absorbed (change) during a chemical reaction is the sum of the potential energy of the products less the sum of the potential energy of the reactants.</span>
        
             
        
        
        
276 grams of carbon in 23.0 moles
        
             
        
        
        
Hi Sara 
I would say it is an amorphous solid. 
Because it's gradually loses shape.
I hope that's help:)
 
        
                    
             
        
        
        
In order from most to least similar:
1. Germanium
2. Lead
3. Phosphorus
4. Chlorine
The elements in the same column as the element you have are the most similar. The rows are not. For example, though chlorine and magnesium are in the same row, they have very different properties, whereas chlorine and fluorine more similar