Question

State if the given statement is a physical or chemical change?

Heating of an iron rod to red hot

Answer 1

Physical change

• The changes which can be observed and specified like changes in color, hardness, rigidity, fluidity, density, melting point, boiling point, etc. are the physical changes.

Chemical change

• A chemical change is a change that results in the formation of new chemical substances.
• It involves the making or breaking of bonds between atoms.

Heating of an iron rod to red hot

• Heating an iron rod to red hot is a physical change because it only changes to red hot and does not alter chemically.
• Iron rod will remain same after cooling, hence no new substance is formed.
• Hence, it is a physical change.