Question

In chemical reactions, there is a conservation of(1) energy, volume and mass

Answer 1

Answer: option (3) energy, charge and mass.


Explanation:


1) The conservation of energy is a universal principle: energy is neither created nor destroyed. This is the first law of thermodynamic.


2) Mass conservation is another universal principle: mass is neither created nor destroyed. This principle is the base of the stochiometry: thas mass of the reactans equal the mass of the products. Another consequence, since the atoms are not transformed in the chemical reactions, is that the number of each kind of atoms in the reactants equal the number of the same kind of atoms in the products.


3) The third principle is the conservation of charge. Also, charge is neither created nor destroyed. The electrons gained/lost by one species are lost/gained by other species. So, when one atom or molecule is oxidized other is reduced.

Answer 2

(3) energy, charge, and mass