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Chemical Equations

Telangana Board · Class 10 · Physical Sciences

Quick revision notes for Chemical Equations — Telangana Board Class 10 Physical Sciences. Key concepts, formulas, and definitions for last-minute revision.

44 questions38 flashcards5 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?
Chemical Equations covers several key topics that are frequently asked in Telangana Board Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Chemical Equations — Telangana Board Class 10 Physical Sciences?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and 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.

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