Which of the following equations demonstrates an actual chemical reaction that forms a new substance? a. zn + 2hcl → 2ncl2 + h2 b. h2o + nacl → h2o c. zn + al + cu → zn + cu + al d. c12h22o11 + h2o → h2o + c12h22o11

A

Explanation:

The first option is the only option where new products are formed.

In the D option no new product is formed.

Same goes with option C.

In B no new products are formed.

Change is said to be taken place only with formation of new products from reactants.

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.