Question

which is an example of a physical change?
a) the corrosion of a copper roof
b) fermenting grain to produce alcohol
c) magnetizing an iron bar
d) decomposing compost

Explanation:

A physical change alters the form or appearance of a substance without changing its chemical composition. Corrosion, fermentation, and decomposition are chemical changes as new substances are formed. Magnetizing an iron - bar only changes its magnetic properties without changing its chemical makeup.

Answer:

C. magnetizing an iron bar