Question

Kneading of wheat flour is physical changes or chemical changes. Why.

Answer 1

Explanation:

Physical changes refer to the changes in the physical properties of the substances such as shape, size, colour and state. These changes are reversible in nature. In a physical change no new substance is formed.

Tearing a piece of paper changes its shape and size.

Similarly kneading of flour to dough changes its state.

Melting of ice is also a physical change where the matter is changing its state from solid to liquid.

Rolling of chapati/roti

Crushed can

Answer 2

Answer:

Kneading of wheat flour is a physical change.

Explanation:

Physical change: Those changes in which variation in only the physical state of the substance takes place is known as physical change. For example : Freezing of water and kneading of wheat flour. While kneading the composition of fibre, proteins, minerals present in wheat flour do not change, rather the physical state of the flour changes.

Chemical change : In chemical changes, the chemical composition and atomic arrangement of the substance changes. Chemical change is irreversible in nature. For example: Burning of paper.