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Class 7 Science Chapter 5 Infographics - Physical and Chemical Changes

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Physical Change
Physical changes in matter involve a change in one or more
physical properties of a substance, such as its shape, size,
or state of matter, without changing its chemical
composition.
Breaking an egg Shredding Melting ice
Boiling water Chopping Cutting hair
Chemical Change
Chemical changes in matter involve a change in the
chemical composition of a substance, resulting in the
formation of one or more new substances.
Rotting apple Rusting hammer Digestion
Souring milk Burning wood Frying eggs
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FAQs on Class 7 Science Chapter 5 Infographics - Physical and Chemical Changes

1. What is the difference between a physical change and a chemical change?
Ans. A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or freezing), shape, or size. In contrast, a chemical change involves a transformation that alters the chemical composition of a substance, resulting in the formation of new substances. Examples include rusting of iron or burning wood.
2. Can you provide examples of physical changes?
Ans. Yes, examples of physical changes include melting ice to water, boiling water to steam, dissolving sugar in water, and breaking a glass. In each case, the substance retains its original properties and can often be reverted to its original state.
3. What are some common signs of a chemical change?
Ans. Common signs of a chemical change include the production of gas (bubbles), a change in color, the formation of a precipitate (solid), and the release or absorption of heat or light. These changes indicate that a new substance may have formed.
4. How can you determine if a change is physical or chemical?
Ans. To determine if a change is physical or chemical, observe the properties of the substances before and after the change. If the original substance can be recovered and no new substances are formed, it is likely a physical change. If new substances are formed and the original cannot be recovered, it is a chemical change.
5. Are physical changes reversible and chemical changes irreversible?
Ans. Generally, physical changes are reversible, meaning the original substance can be restored (e.g., freezing and melting water). Chemical changes are often irreversible, as they result in new substances that cannot easily revert to the original substances (e.g., burning wood to ash). However, some chemical changes can be reversed under certain conditions.
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