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Chemical Bonding and Molecular Structure

ICSE · Class 11 · Chemistry

Quick revision notes for Chemical Bonding and Molecular Structure — ICSE Class 11 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

109 questions36 flashcards5 concepts

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A step-by-step electron dot diagram illustrating the formation of a single covalent bond in a Hydrogen (H2) molecule, showing the mutual sharing of one electron pair to achieve duplet configuration.
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Key Topics to Revise

1

1. Why Atoms Combine and the Octet Rule

  • Atoms combine to acquire stability and lower potential energy.
  • Noble gases are stable because their valence shells are complete.
  • Kossel and Lewis proposed that atoms form bonds by gaining, losing, or sharing electrons to achieve noble gas configuration.
2

2. Ionic Bonding and Ionic Compounds

  • An ionic bond is generally formed between a metallic and a non-metallic atom.
  • Ionic bonding happens when electronegativity difference is large.
  • Electropositive atoms lose electrons and become cations; electronegative atoms gain electrons and become anions.
3

3. Born-Haber Cycle and Lattice Energy

  • Born-Haber cycle represents the energy changes in forming an ionic compound from its elements.
  • It is used to calculate lattice energy or heat of formation.
  • For sodium chloride, the steps include sublimation of sodium, ionisation of sodium, dissociation of chlorine, electron gain by chlorine, and lattice formation.
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4. Covalent Bonding and Covalent Compounds

  • A covalent bond is formed by mutual sharing of electrons between atoms of similar or almost similar electronegativity.
  • Atoms of groups 14, 15, 16, and 17 commonly form covalent bonds.
  • Covalent compounds usually exist as gases, liquids, or soft solids.

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Full Notes

Key Concepts

Atoms combine because a bonded systemDuring bond formationAn ionic bond is the electrostaticA covalent bond forms by mutualA coordinate covalent bond is

Frequently Asked Questions

What are the important topics in Chemical Bonding and Molecular Structure for ICSE Class 11 Chemistry?
Key topics in Chemical Bonding and Molecular Structure include Mind map comparing properties of covalent compounds, Flowchart showing Born-Haber cycle for NaCl formation, Flowchart showing Born-Haber cycle for NaCl formation. These are the concepts ICSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Chemical Bonding and Molecular Structure — ICSE Class 11 Chemistry?
Understand the core concepts first, then work through the 109 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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