Question

1. all of the following are chemical changes except

a iron rusting,
b ice cubes melting,
c pennies tarnishing,
d food spoiling.

Explanation:

A chemical change results in a new substance being formed. Iron rusting is a reaction with oxygen to form iron - oxide. Pennies tarnishing is a chemical reaction with sulfur - containing compounds in the air. Food spoiling involves chemical reactions like oxidation and decomposition by bacteria. Ice cubes melting is a physical change where water changes from solid to liquid without forming a new substance.

Answer:

B. ice cubes melting