Consider the following chemical equations.Select the equations that represent chemical reactions, rather than physical changes.

Question

Quizplus · Accepted Answer

Chemical reactions involve the formation of new substances with different properties from the starting materials. 
-I: This equation represents a chemical reaction because new substances are formed (NaCl and H2O), which have different properties from the reactants (NaOH and HCl).
-II: This equation represents a physical change because no new substances are formed – only water is changing phases from a liquid to a gas.
-III: This equation represents a chemical reaction because new substances are formed (H2O and CO2), which have different properties from the reactants (H2CO3).

Consider the Following Chemical Equations