<span>Fe(NO3)2
The NO3 part is a poly-atomic ion with total charge -1. 
This is because Fe has a +2 charge and two NO3's with a -1 charge will balance out to 0.
 Most often we just make the assumption that Oxygen has a -2 oxidation number because it is very electro-negative. 
So to find N, we just need an oxidation number that balances out with 3(-2) to get -1 (the total charge of the ion)</span>
        
             
        
        
        
Answer:
The answer is A. a wave of vibrating electric and magnetic energy.
 
        
             
        
        
        
Answer:
3Ca₍s₎ + 2FeCl₃ ------------------------------------------------------------->  3CaCl₂ + 2Fe₍s₎.
Explanation:
Iron(III) chloride is also known as Iron trichloride and it has the molar mass value of 162.2 g/mol and density of 2.9 g/cm³. 
<em>The balanced equation for the chemical reaction between solid calcium and iron (III) chloride is given below as:  </em>
<em />
3Ca₍s₎ + 2FeCl₃ ------------------------------------------------------------->  3CaCl₂ + 2Fe₍s₎.
This kind of chemical reaction is known as <em>single displacement reaction or single replacement reaction. </em>
 
        
             
        
        
        
Answer:
No, the only way they can be separated is through chemical methods. ... A compound is made up of two or more elements that are chemically combined and elements are combined to form a compound.
Explanation: