6. CHANGES AROUND US Class 6 Science [LATEST] Solutions Chapter Review in English - CBSE Study
NCERT Solutions for Class 6 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 6. CHANGES AROUND US with detailed explanations and step-by-step answers for better exam preparation. Each Chapter Review is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 6 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 6 English Medium Science All Chapters:
6. CHANGES AROUND US
1. Chapter Review
Chapter Review:
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There are many changes around us which is continuous process. - Some changes occur naturally and some changes are made by us.
- Some such changes are: Raw egg to boiled egg, milk to curd, flour to bread, bud to flower, cow dung to biogas, rusting of iron, freezing water into ice, burning of coal, woods into furnitures, fibres into fabric, Changing of season, changing shape of moon etc.
- Some changes are reversible and some are non-reversible.
- A change may occur by heating a substance or by mixing it with some
other. - There are different types of changes, i.e physical changes, chemical changes, reversible, non-reversible periodic changes and aperiodic changes.
- The changes which can be reversed to their original forms are called reversible changes. Like water changes into ice,
- The changes which can not come into their original forms are called non-reversible or irreversible changes. Like changing milk into curd, rusting of iron, burning of coal or papers etc.
- Changes which are repeated after regular intervals of time are called periodic changes. like (i) Rising of sun. (ii) Motion of pendulum. (iii) Occurring of seasons one after the other.
- There are changes that do not take place regularly. These are called aperiodic change.
- When an object is heated it becomes larger in size and on cooling it contracts this is known as contraction.
- When an object expands or melts on heating this is known as expansion.
- Changing of water into gas on heating is called evaporation.
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