Αποτελέσματα Αναζήτησης
Access answers of NCERT Class 7 Science Chapter 6 – Physical and Chemical Changes. Exercise Questions . 1. Classify the changes involved in the following processes as physical or chemical changes. (a) Photosynthesis (b) Dissolving sugar in water (c) Burning of coal (d) Melting of wax (e) Beating aluminium to make aluminium foil (f ) Digestion ...
25 Σεπ 2019 · When a candle burns, both physical and chemical changes occur: (i) Physical change: melting of wax, vapourisation of melted wax. (ii) Chemical change: Burning of vapours of wax to give carbon dioxide, heat and light.
Full syllabus notes, lecture and questions for NCERT Solutions for Class 7 Science - Physical and Chemical Changes - Class 7 - Plus excerises question with solution to help you revise complete syllabus for Science Class 7 - Best notes, free PDF download.
Key Features of NCERT Class 7 Science Chapter 'Physical and Chemical Changes' question answers : All chapter question answers with detailed explanations. Simple language for easy comprehension. Aligned with the latest NCERT guidelines. Perfect for exam preparation and revision.
Question 1. Classify the changes involved in the following processes as physical or chemical changes: (a) Photosynthesis. (b) Dissolving sugar in water. (c) Burning of coal. (d) Melting of wax. (e) Beating aluminium to make aluminium foil. (f) Digestion of food. Answer. Question 2. State whether the following statements are true or false.
Answer: Physical Changes: On heating, candle wax gets melted is a physical change. Since it again turns into solid wax on cooling. Chemical Changes: The wax near to flame burns and gives new substances like Carbon Dioxide, Carbon soot, water vapour, heat and light.
4 Ιαν 2024 · Answer: (a) Photosynthesis: Chemical change. Photosynthesis involves the conversion of carbon dioxide and water into glucose and oxygen, a transformation of substances into entirely new ones through chemical reactions. (b) Dissolving sugar in water: Physical change.
