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Questions and Answers
Which type of changes involve changes in the physical properties of a substance, but the substance is not changed in its chemical form?
What is an example of a physical change?
Which type of changes are usually reversible?
What do chemical changes involve?
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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
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Description
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.
