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Changes Around Us: Physical and Chemical — Flashcards

CBSE · Class 7 · Science

60 flashcards for Changes Around Us: Physical and Chemical (CBSE Class 7 Science) to test yourself on key terms and facts.

42 questions60 flashcards5 concepts

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60 Flashcards·
Physical changesशारीरिक परिवर्तनChemical changesरासायनिक परिवर्तनLime water testचुनका पानी परीक्षणChemical equationsरासायनिक समीकरण
Card 1Physical changes

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.

Card 2शारीरिक परिवर्तन

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।…

Card 3Chemical changes

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.

Card 4रासायनिक परिवर्तन

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।…

Card 5Lime water test

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.

Card 6चुनका पानी परीक्षण

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।…

Card 7Chemical equations

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.

Card 8रासायनिक समीकरण

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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Frequently Asked Questions

What are the important topics in Changes Around Us: Physical and Chemical for CBSE Class 7 Science?
Key topics in Changes Around Us: Physical and Chemical include Types of Changes, Examples of Physical and Chemical Changes, Chemical Change Indicators, Combustion and Fire Triangle. Study these first, then practise questions on each for Class 7 exams.
How many flashcards are available for Changes Around Us: Physical and Chemical?
There are 60 flashcards for Changes Around Us: Physical and Chemical covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Changes Around Us: Physical and Chemical for Class 7 exams?
Learn the core ideas first, then work through the 42 practice questions on Changes Around Us: Physical and Chemical. Revise definitions regularly and use flashcards for quick recall before the exam.

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