Q9..Which of the following are physical changes?
Melting of iron metal, rusting of iron, bending of iron rod, drawing a wire of iron metal.
Solution:
Change in physical properties of a material is known as physical change. For example: melting of wax, boiling of water and more. Melting of iron metal, bending of iron rod and drawing a wire of iron metal is a physical change because during all the three processes the physical state of the iron is changed. In contrast rusting if iron is a chemical change during which the iron composition is changed leading to formation of iron oxide.
Change in physical properties of a material is known as physical change. For example: melting of wax, boiling of water and more. Melting of iron metal, bending of iron rod and drawing a wire of iron metal is a physical change because during all the three processes the physical state of the iron is changed. In contrast rusting if iron is a chemical change during which the iron composition is changed leading to formation of iron oxide.