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Everyday we encounter differing types of changes.

Everyday we encounter differing types of changes. Turning day into night, night into each day, rising and setting of sun and moon, changing of climate, melting of ice, and much more. These changes occur during a minute or take an extended time. Few changes are not even noticeable.

Reversible Change Reversible change is that change that can be reversed by one or more methods. Usually, there is a change in physical properties, shape and size of the material. Mostly a replacement substance isn’t formed during a reversible change. For eg: Paper folding, spring elongation etc. Change Any difference in the size or shape of an object is referred to as a change. Changes are either reversible or irreversible. Irreversible Change The change which is permanent and can’t be undone by any physical or chemical means is called an irreversible change.Formation of the latest substance is involved during this change. For example, the burning of a candle is an irreversible change as we cannot revisit the candle once burnt.

Anomalous Expansion of Water Water on cooling contracts up to 4°C. On further cooling, up to 0°C, water expands instead of contracting with decrease in temperature. This means that as the temperature decreases from 4°C to 0°C, water expands. This behaviour is called anomalous expansion of water. Burning Burning is an irreversible change where a substance burns to supply new material. These new materials are ash and some gases. For example, paper is burnt to supply ash which is different from paper in terms of appearance and properties. Separation The separation of the components of a mixture or an impure substance are carried out with the following purposes : To remove the unuseful or harmful component.

Q1. Define Changes Around Us. Ans: Everyday we encounter different types of changes. Turning day into night, night into each day , rising and setting of sun and moon, changing of climate, melting of ice, and much more. These changes occur during a minute or take an extended time. Few changes are not even noticeable. Q2. What is Expansion and Contraction? Ans: The particle of a substance expands or becomes loose when the temperature increases. When this happens, the material is said to undergo expansion.

Q3. What are the 2 Types of Changes? Ans: Reversible Change Reversible change is that change that can be reversed by one or more methods. Usually, there is a change in physical properties, shape and size of the material. Mostly a replacement substance isn’t formed during a reversible change. For eg: Paper folding, spring elongation etc. Change Any difference in the size or shape of an object is referred to as a change. Changes are either reversible or irreversible. Irreversible Change The change which is permanent and can’t be undone by any physical or chemical means is called an irreversible change.Formation of the latest substance is involved during this change. For example, the burning of a candle is an irreversible change as we cannot revisit the candle once burnt.

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