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Chemical Arithmetics

Telangana Open School (TOSS) · Class 12 · Chemistry

Quick revision notes for Chemical Arithmetics — Telangana Open School (TOSS) Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

53 questions30 flashcards4 concepts

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Key Topics to Revise

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1. Molecular and Empirical Formulae

  • Molecular formula shows the actual number of atoms of each element in a molecule.
  • Empirical formula gives the simplest whole-number ratio of atoms in a compound.
  • For some compounds like glucose (C₆H₁₂O₆), the molecular formula is a multiple of the empirical formula (CH₂O).
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2. Percentage Composition and Empirical Formula

  • Percentage composition tells the mass percent of each element in a compound.
  • It is calculated using the molar mass of the compound and the total mass of each element in one mole.
  • To find empirical formula from percentage data: convert % to grams → grams to moles → divide by smallest mole value → get simplest ratio.
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3. Stoichiometry and Chemical Equations

  • A balanced chemical equation shows the exact mole ratios of reactants and products.
  • Stoichiometry uses these ratios to calculate masses, volumes, and number of particles involved.
  • Information from equations can be expressed in atoms, moles, mass, or volume (for gases at STP).
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4. Limiting Reagent and Reaction Yield

  • The limiting reagent is the reactant that is completely consumed and determines the maximum amount of product formed.
  • Other reactants are in excess and remain after the reaction.
  • To identify the limiting reagent: calculate how much product each reactant can form — the one giving the least product is limiting.

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Full Notes

Key Concepts

The empirical formula shows the simplestIt is the percentage by massThe mole concept connects the microscopicThe limiting reagent is the reactant

Frequently Asked Questions

What are the important topics in Chemical Arithmetics for Telangana Open School (TOSS) Class 12 Chemistry?
Chemical Arithmetics covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 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 Arithmetics — Telangana Open School (TOSS) Class 12 Chemistry?
Understand the core concepts first, then work through the 53 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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All 41 chapters — Telangana Open School (TOSS) Class 12 Chemistry Revision Notes

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