Answer: The reaction is endothermic.
Explanation:
Endothermic reaction : It is a type of chemical reaction where the energy is absorbed from the surrounding. In the endothermic reaction, the reactant have less energy than the energy of products
In endothermic reaction, enthalpy terms is located on the reactant side.
Example: 
Exothermic reaction : It is a type of chemical reaction where the energy is released into the surrounding. In the exothermic reaction, the energy of reactants are more than the energy of products
In exothermic reaction, enthalpy terms is located on the product side.
Example: 
In order to balance reactions, the number of each element must be the same on the left and right side. If I have 3 of element X on one side, I must have 3 of element X on the other side. That being said:
Zn + Fe(NO3)2 —> ZnNO3 + Fe
I have two NO3 groups on the left, so I will add a coefficient of 2 in front of the compound which has an NO3 group on the right side.
Zn + Fe(NO3)2 —> 2ZnNO3 + Fe
Since I now have 2 Zn’s on the right, and only 1 on the left, I will add a coefficient of 2 in front of Zn on the left.
2Zn + Fe(NO3)2 —> 2ZnNO3 + Fe
Lets check:
Zn: 2 right, 2 left (correct)
Fe: 1 right, 1 left (correct)
NO3 groups: 2 right, 2 left
We have successfully balanced the equation. :)
Answer is: oxidation number of nitrogen is +5 (<span>3. 5).
Oxygen has greater electronegativity than nitrogen, so oxygen has negative oxidation number, in this compound -2, so oxidation number of nitrogen is +5:
2 </span>· x + 5 · (-2) = 0.
2x = 10.
x = 10 ÷ 2.
x = 5; oxidation number of nitrogen.
<span>The sum of the oxidation numbers in a neutral compound is zero.</span>
Answer:
A
Explanation:
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