Understanding the Difference between Physical and Chemical Changes

In Grade 9 Science, particularly in Chemistry, students learn about physical and chemical changes. A physical change involves altering the form or appearance of a substance without changing its composition. Examples include melting, freezing, or dissolving. On the other hand, a chemical change results in the formation of new substances with different properties. This change is usually irreversible. Hence, it's crucial for students to distinguish between the two types of changes and understand the factors that differentiate them.