CBSE Class 10 > Class 10 Videos > Science > Detailed Explanation: Chemical Reaction & Equations
Detailed Explanation: Chemical Reaction & Equations Video Lecture | Science Class 10
FAQs on Detailed Explanation: Chemical Reaction & Equations
| 1. What's the difference between a chemical reaction and a physical change? |  |
Ans. A chemical reaction produces new substances with different properties through breaking and forming bonds, while physical change only alters appearance or state without creating new matter. For example, burning wood is chemical (ash forms), but melting ice is physical (water remains). Understanding this distinction is crucial for CBSE Class 10 science exams and identifying reaction types correctly.
| 2. How do I balance chemical equations step by step? | |
Ans. Balance equations by counting atoms of each element on both sides, adjusting coefficients (not subscripts) until equal. Start with metals, then non-metals, then oxygen and hydrogen last. The law of conservation of mass requires equal atoms before and after the reaction. Practise with simple equations first, then progress to complex ones for exam confidence.
| 3. Why do some substances change colour during a chemical reaction? | |
Ans. Colour changes occur because new chemical bonds form, creating compounds with different molecular structures that absorb and reflect light differently. This visible evidence indicates a chemical reaction has occurred. For instance, copper turns black when heated (forming copper oxide), helping students recognise reactions in practical experiments and real-world applications like rusting and combustion.
| 4. What are the main types of chemical reactions I need to know for board exams? | |
Ans. The five key types are: combination (two substances form one), decomposition (one substance splits), displacement (element replaces another), double displacement (ions exchange), and redox (electron transfer). Each type follows predictable patterns and produces characteristic products. CBSE focuses heavily on these classifications, so mastering identification and equation balancing for each type is essential for scoring well.
| 5. How can I tell if a chemical reaction has actually happened? | |
Ans. Observable signs include colour change, gas evolution (bubbling), temperature change (heating or cooling), precipitate formation (solid in solution), or odour production. These indicators confirm bond breaking and new substance formation, distinguishing chemical reactions from physical changes. Recognising these signs during experiments helps students answer observation-based questions accurately on Class 10 science assessments.
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Apr 19, 2026 Last updated
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