That is false.
An ion is "<span>an electrically charged atom or group of atoms formed by the loss or gain of one or more electrons."
But in detail anion means gaining of electrons.
So, a gain of electrons by an atom creates an anion.</span>
        
                    
             
        
        
        
The answer would be C: energy is released to form radiation.
        
                    
             
        
        
        
Answer:b.CaCl2
Explanation:
 A compound is  a substance resulting when two or more elements  are are chemically bonded together either ionically or covalently in a fixed ratio.
 From the given options we can see that the only compound there  is CaCl2 which is an ionic compound in the fixed  ratio of one calcium ion to two chloride ions.
 Other options , Cu,Na and Nd are merely pure substance---Elements 
 
        
             
        
        
        
Answer: 

Explanation:
We have the reactions:
A: 
B: 
Our <u>target reaction</u> is:

We have  as a reactive in the target reaction and
 as a reactive in the target reaction and   is present in A reaction but in the products side. So we have to<u> flip reaction A</u>.
 is present in A reaction but in the products side. So we have to<u> flip reaction A</u>.
A: 
Then if we add reactions A and B we can obtain the target reaction, so:
A: 
B: 
For the <u>final Kc value</u>, we have to keep in mind that when we have to <u>add chemical reactions</u> the total Kc value would be the <u>multiplication</u> of the Kc values in the previous reactions.

