Which of the following statements about conservation of mass is true? in a chemical reaction, the mass of the reactants is always greater than the mass of the products. in a chemical reaction, the mass of the products is always greater than the mass of the reactants. mass is conserved in physical changes, but not chemical changes . mass is conserved in both physical and chemical changes.

The correct answer is  D. Mass is conserved in both physical and chemical changes.

Option (d) is the correct answer.

Explanation:

According to law of conservation of mass, mass can neither be created nor it can be destroyed as it can only be transferred from one form to another.

This means that in a chemical reaction the mass of reactants is equal to the mass of products.

For example,

Total mass of reactants is as follows.

              g/mol

              = 116 g/mol

Total mass of products is as follows.

             2NaCl =

                         = (2 \times 58) g/mol

                         = 116 g/mol

Hence, we can conclude that mass is conserved in both physical and chemical changes.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.