Read the paragraph and note down the various types of changes it mentions:-
It was nearing six o'clock in the evening. The sun was setting. A breeze was blowing. Leaves on the tree were shaking. Sahil was sitting in the courtyard, rolling balls of wet soil and shaping them into various toys. Then he felt hungry and went into the house. Mother made a dough from wheat flour and fried purees. While eating hot purees, his attention was drawn outside the window. It had started raining. There was lightning, too. Sahil was enjoying his dinner in the dim light.
Answers
Explanation:
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Required AnswErs:-
➢ It was nearing six o’clock in the evening: Time → reversible, periodic
Changes
➢ The sun was setting: Sunset → Periodic, reversible Changes
➢ A breeze was blowing: Blowing → Physical, non-periodic changes
➢ Leaves on the tree were shaking: Movements due to wind→
Physical, periodic changes
➢ Sahil was sitting in the courtyard, rolling balls of wet soil and shaping
them into various toys: Making toys of soil → Physical changes
➢ Then he felt hungry and went into the house: Hunger → Periodic changes
➢ Mother made a dough from wheat flour and fried purees: Frying →
Physical, irreversible changes
While eating hot purees, his attention was drawn outside the window:
Seeing randomly → Non-periodic
9) It had started raining: Raining → Physical, periodic if raining in specific
season changes
10) There was lightning: Lightning → Physical, Chemical, Fast changes
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Something MorE:-
❄ What is a chemical change in a substance.
➢ Chemical changes are changes that involve reaction of substances with one another. Such reactions result in alterations in the chemical compositions of the substances involved. These changes lead to the information of new substances.
Characteristics:-
- One or more new substances are formed during a chemical change.
- Most chemical changes cannot be reversed easily.
- The chemical composition of a substance undergoing chemical change does not remain the same.
- A chemical change is always accompanied by a change in energy.
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