Changes Around Us: Physical and Chemical
CBSE · Class 7 · Science
Flashcards for Changes Around Us: Physical and Chemical — CBSE Class 7 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is a physical change?
Answer
A physical change is a change in shape, size, or state of a substance, and no new substance is formed. Melting ice, folding paper, and crushing chalk are physical changes.
भौतिक परिवर्तन क्या है?
Answer
भौतिक परिवर्तन किसी पदार्थ के आकार, माप या अवस्था में परिवर्तन है और कोई नया पदार्थ नहीं बनता है। बर्फ का पिघलना, कागज को मोड़ना, चाक को कुचलना भौतिक परिवर्तन हैं।…
What is a chemical change?
Answer
A chemical change is a change in which one or more new substances are formed through a chemical reaction. Lime water turning milky, rusting, and burning magnesium are chemical changes.
रासायनिक परिवर्तन क्या है?
Answer
रासायनिक परिवर्तन एक ऐसा परिवर्तन है जिसमें रासायनिक अभिक्रिया के द्वारा एक या एक से अधिक नए पदार्थ बनते हैं। चूने का पानी दूधिया होना, जंग लगना, मैग्नीशियम का जलना रासायनिक परिवर्तन हैं।…
Why does lime water turn milky when exhaled air is passed through it?
Answer
Exhaled air contains carbon dioxide. It reacts with lime water and forms calcium carbonate, which is a new white insoluble substance. That is why the liquid turns milky.
जब चूने के पानी से साँस की हवा निकाली जाती है तो वह दूधिया क्यों हो जाता है?
Answer
निःश्वासित वायु में कार्बन डाइआक्साइड होता है। यह चूने के पानी के साथ प्रतिक्रिया करके कैल्शियम कार्बोनेट बनाता है, जो एक नया सफेद अघुलनशील पदार्थ है। इसी कारण तरल दूधिया हो जाता है।…
What is the chemical equation for the lime water test?
Answer
Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water. Lime water is calcium hydroxide, and the new insoluble substance formed is calcium carbonate.
चूने के पानी के परीक्षण के लिए रासायनिक समीकरण क्या है?
Answer
कैल्शियम हाइड्रॉक्साइड + कार्बन डाइआक्साइड → कैल्शियम कार्बोनेट + जल चूने का जल कैल्शियम हाइड्रॉक्साइड है, नया अघुलनशील पदार्थ कैल्शियम कार्बोनेट है।…
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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