Question 1.6 - Chemistry: Molecular Nature Of Matter And Change

Question

Which of the following is a chemical change? Explain your reasoning: (a) boiling canned soup; (b) toasting a slice of bread; (c) chopping a log; (d) burning a log.

Step-by-Step Solution

Answer

Answer

Chemical changes are toasting a slice of bread and burning a log.

Physical changes are boiling canned soup and chopping a log.

Definition

The change in which there is no formation of new bonds is called a physical change. There is only a change in the physical property where there is no change in composition.

The change in the creation of new compounds is called a chemical change.

Type of change

When there is no formation of new compounds called a physical change. Boiling a canned soup is a physical change. It is reversible.

There is a change in the brownish color of bread after toast and irreversible called chemical change. Toasting a slice of bread is a chemical change.

Since there is no formation of a new substance, it is a physical change. Chopping a log is a physical change. There is only a change in its size.

There is a formation of new compounds between carbon and oxygen, and it is not reversible. Burning a log is a chemical change.