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Which type of changes involve changes in the physical properties of a substance, but the substance is not changed in its chemical form?
Which type of changes involve changes in the physical properties of a substance, but the substance is not changed in its chemical form?
- Reversible changes
- Physical changes (correct)
- Irreversible changes
- Chemical changes
What is an example of a physical change?
What is an example of a physical change?
- Rusting of iron
- Burning wood
- Cooking an egg
- Dissolving sugar in water (correct)
Which type of changes are usually reversible?
Which type of changes are usually reversible?
- Chemical changes
- Mechanical changes
- Biological changes
- Physical changes (correct)
What do chemical changes involve?
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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