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Chemistry explained questions and answers: 1st Sem

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Chemistry explained questions and answers: 1st Semester (Chapters 1-3)
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What is the fundamental difference between physical and chemical changes? ️ A physical change alters form or state without changing composition, while a chemical change produces new substances with different compositions How does the law of conservation of mass apply in chemical reactions? ️ The total mass of reactants equals the total mass of products because matter is neither created nor destroyed What defines an element in chemistry? ️ A pure substance made of only one type of at...

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  • uploaded  2026
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