Chapter 13 of 18
Revision Notes
Carbon : An important element — Revision Notes
Maharashtra Board · Class 9 · Science
Carbon : An important element revision notes for Maharashtra Board Class 9 Science: 4 topics in quick points. Includes Basic Properties and Occurrence.
43 questions22 flashcards2 formulas & key relations5 concepts
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Key Topics to Revise
1
Basic Properties and Occurrence of Carbon
- Carbon is a non-metallic element with symbol C, atomic number 6, atomic mass 12
- Electronic configuration: 2,4 with valency 4
- Forms 4 covalent bonds by sharing electrons
2
Allotropes of Carbon
- Carbon has crystalline forms (diamond, graphite, fullerene) and amorphous forms (coal, charcoal, coke)
- Diamond: Hardest natural substance, 3D tetrahedral structure, electrical insulator, density 3.5 g/cm³
- Graphite: Soft, layered hexagonal structure, electrical conductor, density 1.9-2.3 g/cm³
3
Hydrocarbons
- Hydrocarbons contain only carbon and hydrogen atoms
- Saturated hydrocarbons have only single bonds (alkanes)
- Unsaturated hydrocarbons have double or triple bonds (alkenes, alkynes)
4
Carbon Dioxide (CO₂)
- Molecular formula: CO₂, Molecular mass: 44, Melting point: -56.6°C
- Present in air as 0.03%, in exhaled air as 4%
- Colorless, odorless gas, denser than air
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Full NotesKey Concepts
Carbon has atomic number 6Carbon exists in different physical formsCompounds containing only carbon and hydrogenMolecular mass 44Molecular mass 16
Frequently Asked Questions
What are the important topics in Carbon : An important element for Maharashtra Board Class 9 Science?
Key topics in Carbon : An important element include Basic Properties and Occurrence of Carbon, Allotropes of Carbon, Hydrocarbons, Carbon Dioxide (CO₂). Study these first, then practise questions on each for Class 9 exams.
How should I revise Carbon : An important element for Class 9 exams?
Learn the core ideas first, then work through the 43 practice questions on Carbon : An important element. 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.
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