Question

Explain the difference between physical and chemical changes.

A) Physical changes involve a change in substance, while chemical changes do not.
B) Chemical changes involve a change in substance, while physical changes do not.
C) Physical changes always produce a new substance.
D) Chemical changes only affect the appearance of a substance.

Answer 1

Physical and chemical changes are two different types of changes that occur in matter. A physical change involves a change in the appearance or physical properties of a substance without changing its chemical composition. On the other hand, a chemical change involves a change in the chemical composition of a substance.

Step-by-step explanation:

Physical and chemical changes are two different types of changes that occur in matter.

A physical change involves a change in the appearance or physical properties of a substance without changing its chemical composition. Examples of physical changes include melting ice, boiling water, or crushing a soda can. The composition of the substance remains the same in physical changes.

On the other hand, a chemical change involves a change in the chemical composition of a substance. This means that one or more substances react with each other to produce new substances with different properties. Examples of chemical changes include burning wood, rusting iron, or baking a cake. Chemical changes are typically irreversible and result in the formation of new substances.