4 Questions
Which type of changes involve changes in the physical properties of a substance, but the substance is not changed in its chemical form?
Physical changes
What is an example of a physical change?
Dissolving sugar in water
Which type of changes are usually reversible?
Physical changes
What do chemical changes involve?
Alteration in the chemical composition of a substance
Study Notes
In Chapter 5 of Class 7 Science, students learn about physical and chemical changes. These changes can be classified into two types: physical and chemical changes.
Physical changes involve changes in the physical properties of a substance, but the substance is not changed in its chemical form. Examples of physical changes include boiling water, chopping wood, dissolving sugar in water, crumpling of paper, and melting an ice cube. These changes are usually reversible, and the original substance can be obtained back by reversing the change.
Chemical changes, on the
Test your knowledge about physical and chemical changes as discussed in Chapter 5 of Class 7 Science. Explore the differences between physical and chemical changes and their examples, reversibility, and effects.
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