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Atomic Foundations of Matter

CBSE · Class 9 · Science

Flashcards for Atomic Foundations of Matter — CBSE Class 9 Science. Quick Q&A cards covering key concepts, definitions, and formulas.

83 questions84 flashcards5 concepts

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A diagram illustrating two objects with masses M and m, separated by a distance d, showing the gravitational force of attraction between their centers and the relevant variables.
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84 Flashcards
Card 1Laws of chemical combination

What is the Law of Conservation of Mass?

Answer

Matter can neither be created nor destroyed in a chemical reaction. The total mass of reactants is equal to the total mass of products.

Card 2रासायनिक संयोजन के नियम

द्रव्यमान संरक्षण का नियम क्या है?

Answer

किसी रासायनिक अभिक्रिया में पदार्थ न तो बनाया जा सकता है और न ही नष्ट किया जा सकता है। अभिकारकों का कुल द्रव्यमान उत्पादों के कुल द्रव्यमान के बराबर होता है।

Card 3भौतिक परिवर्तन

पानी में नमक घोलने जैसे भौतिक परिवर्तन में द्रव्यमान समान क्यों रहता है?

Answer

पदार्थ केवल मिश्रित होते हैं या रूप बदलते हैं। कोई नया पदार्थ नहीं बनता है, इसलिए कुल द्रव्यमान व्यावहारिक रूप से अपरिवर्तित रहता है।

Card 4Physical change

Why does the mass stay the same in a physical change like dissolving salt in water?

Answer

The substances only mix or change form. No new substance is formed, so the total mass remains practically unchanged.

Card 5Law of Conservation of Mass

What happens in the vinegar and baking soda experiment when the gas escapes?

Answer

The measured mass appears to decrease because carbon dioxide escapes from the container. The mass is conserved, but it is not fully measured in an open setup.

Card 6द्रव्यमान संरक्षण का नियम

जब गैस निकलती है तो सिरका और बेकिंग सोडा के प्रयोग में क्या होता है?

Answer

मापा द्रव्यमान कम होता हुआ प्रतीत होता है क्योंकि कार्बन डाइऑक्साइड पात्र से निकल जाता है। द्रव्यमान संरक्षित है, लेकिन खुले सेटअप में इसे पूरी तरह से नहीं मापा जाता है।

Card 7द्रव्यमान संरक्षण का नियम

सिरका और बेकिंग सोडा प्रयोग में बंद व्यवस्था द्रव्यमान संरक्षण को कैसे सिद्ध करती है?

Answer

जब गैस फँस जाती है, तो प्रारंभिक और अंतिम पाठ्यांक मेल खाते हैं। अभिकारकों का कुल द्रव्यमान उत्पादों के कुल द्रव्यमान के बराबर होता है।

Card 8Law of Conservation of Mass

How does the closed setup in the vinegar and baking soda experiment prove conservation of mass?

Answer

When the gas is trapped, the initial and final readings match. The total mass of reactants equals the total mass of products.

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Frequently Asked Questions

What are the important topics in Atomic Foundations of Matter for CBSE Class 9 Science?
Key topics in Atomic Foundations of Matter include Chapter 9 Gravitation — Complete Concept Map, Gravitation Chapter — Complete Concept Map, Chapter 9 Gravitation — Concept Overview. These are the concepts CBSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Atomic Foundations of Matter — CBSE Class 9 Science?
Understand the core concepts first, then work through the 83 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many flashcards are available for Atomic Foundations of Matter?
There are 84 flashcards for Atomic Foundations of Matter covering key definitions, formulas, and concepts. Use them daily for 10–15 minutes for best results.

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