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Revision Notes

Some Basic Concepts of Chemistry

Maharashtra Board · Class 11 · Chemistry

Quick revision notes for Some Basic Concepts of Chemistry — Maharashtra Board Class 11 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

45 questions25 flashcards5 concepts

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Key Topics to Revise

1

Nature and Classification of Matter

  • Matter occupies space and has mass - can be classified into pure substances and mixtures
  • Pure substances have definite composition and properties (elements and compounds)
  • Elements cannot be broken down by chemical means (metals, non-metals, metalloids)
2

Laws of Chemical Combination

  • Law of Conservation of Mass: Total mass of reactants = Total mass of products
  • Law of Definite Proportions: A compound always contains same elements in same proportion by mass
  • Law of Multiple Proportions: When two elements form multiple compounds, masses of one element combining with fixed mass of another are in simple whole number ratios
3

Atomic Theory and Atomic Mass

  • Dalton's Atomic Theory: Matter consists of indivisible atoms, atoms of same element are identical, compounds form by combining atoms in fixed ratios
  • Atomic mass is measured relative to C-12 isotope (assigned exactly 12 u)
  • 1 atomic mass unit (u) = 1.66056 × 10⁻²⁴ g
4

Mole Concept and Molar Mass

  • 1 mole = 6.022 × 10²³ particles (Avogadro's number)
  • Mole is SI base unit for amount of substance
  • Molar mass = mass of 1 mole of substance in grams

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Full Notes

Key Concepts

Matter is anything that occupies spacePhysical properties (colorSeven fundamental SI unitsFive fundamental lawsAtomic mass is relative to C

Frequently Asked Questions

What are the important topics in Some Basic Concepts of Chemistry for Maharashtra Board Class 11 Chemistry?
Some Basic Concepts of Chemistry covers several key topics that are frequently asked in Maharashtra Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Some Basic Concepts of Chemistry — Maharashtra Board Class 11 Chemistry?
Understand the core concepts first, then work through the 45 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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