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Chemical Equations — Revision Notes

Telangana Board · Class 10 · Physical Sciences

Chemical Equations revision notes for Telangana Board Class 10 Physical Sciences: 4 topics in quick points. Includes Chemical Change and Chemical.

44 questions38 flashcards3 formulas & key relations5 concepts

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Key Topics to Revise

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1. Chemical Change and Chemical Reaction

  • If new substances are formed with properties completely unlike to those of the original substances, a chemical change has taken place.
  • Digestion, burning of crackers, respiration, powdered lime added to water, ripening of mango, and iron nails exposed to moisture are examples of changes to classify as physical or chemical.
  • During a chemical change, the original substances lose their characteristic properties.
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2. Writing Chemical Equations

  • A chemical equation is the symbolic representation of a chemical change.
  • Chemical equations become shorter and more precise when formulae are used instead of words.
  • If no subscript is written in a chemical formula, the number 1 is understood.
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3. Balancing Chemical Equations

  • All chemical equations must be balanced because atoms are neither created nor destroyed in chemical reactions.
  • According to the law of conservation of mass, the total mass of products must equal the total mass of reactants.
  • The number of atoms of each element before and after reaction must be the same.
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4. Making Equations More Informative

  • A chemical equation can show physical states, heat changes, gas evolved, precipitate formed, and reaction conditions.
  • The physical states gaseous, liquid, and solid are represented by (g), (l), and (s) respectively.
  • Aqueous solutions are written as (aq).

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Full Notes

Key Concepts

A chemical change produces new substancesReactants are the substances that undergoA chemical equation is the symbolicA skeleton equation is an unbalancedA balanced chemical equation has

Frequently Asked Questions

What are the important topics in Chemical Equations for Telangana Board Class 10 Physical Sciences?
Key topics in Chemical Equations include Chemical Change and Chemical Reaction, Writing Chemical Equations, Balancing Chemical Equations, Making Equations More Informative. Study these first, then practise questions on each for the Telangana Board Class 10 board exam.
How should I revise Chemical Equations for the Telangana Board Class 10 board exam?
Learn the core ideas first, then work through the 44 practice questions on Chemical Equations. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Chemical Equations

All Telangana Board Class 10 Physical Sciences Revision Notes

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