Class 7

Class 7 / Class 7 Science Chapter-6- Physical and Chemical Changes

Class 7 science -Chapter 6- Physical and Chemical Changes- Definition and Explanation of Important Keywords

- by Jaishree Gorane - Leave a Comment

In the study of physical and chemical changes, understanding key terms is crucial. Chemical Change involves substances transforming into new ones, while a Chemical Reaction rearranges molecular structures. Crystallisation forms solid crystals from solutions, aiding purification. Galvanisation shields iron with a zinc layer to prevent rust. Physical Change alters appearance without changing composition, and Rusting is a destructive corrosion process affecting iron objects.

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Physical and Chemical Changes- Complete Notes
Class 7 / Class 7 Science Chapter-6- Physical and Chemical Changes

Class 7 science -Chapter 6-Physical and Chemical Changes- Complete Notes

- by Jaishree Gorane - Leave a Comment

In Class 7 Science, Chapter 6, we delve into Physical and Chemical Changes. Physical changes alter a substance’s physical properties without changing its composition, like melting ice. Chemical changes form new substances, such as rusting iron. We explore indicators, energy changes, and conservation of mass, providing a comprehensive understanding of these fundamental concepts in science.

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Crystallization - Class 7
Class 7 / Class 7 Science Chapter-6- Physical and Chemical Changes / Uncategorized

Crystallization – Class 7

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Crystallization process we explore in Class 7, transforms ordinary solutions into pure, well-defined crystals. It’s like growing sparkling gems from a liquid mixture! This physical change is vital in various industries, purifying substances, producing medicines, and even creating the sugar we use daily.

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Physical and Chemical Change
Class 7 / Class 7 Science Chapter-6- Physical and Chemical Changes / Class 9

Differences between Physical and Chemical Changes

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Certain transformations in matter are categorised as either physical or chemical changes. Physical changes involve alterations in a substance’s physical properties, like shape or state, without changing its composition. In contrast, chemical changes result in new substances forming with different compositions. These distinctions are essential in understanding diverse processes, from melting ice to rusting iron, shedding light on the nature of matter.

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Chapter 5-Acids, Bases and Salts / Class 7

Acid Rain – Class 7 -Chapter 5-Acids, Bases and Salts 

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Understand the environmental issue of Acid Rain, explored in Class 7’s Chapter 5 on Acids, Bases, and Salts. Learn about its origin from pollutants like carbon dioxide and its damaging effects on buildings, monuments, and natural ecosystems. Understand the role of acid rain in disrupting the balance of our environment and its impact on future generations.

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