(16070) The Structural Characteristics of CARBON | Carbon Compounds | Grade 9 Science Quarter 2 Week 4-5

Carbon in Everyday Life

  • Carbon Dioxide in Soda:

    • Carbon dioxide (CO2) provides carbonation in soda.

    • The pressure inside cans dissolves CO2 in the liquid, creating bubbles when opened.

  • Common Carbon Products:

    • Examples include batteries, charcoal, and diamonds.

    • Trivia: Carbon is one of the most abundant elements in the universe.

Properties of Carbon

  • Carbon Symbol: C

  • Atomic Number: 6 (indicates 6 protons and electrons).

  • Atomic Weight: 12.01 grams.

  • Electron Configuration: 1s² 2s² 2p².

  • Lewis Dot Structure:

    • Has 4 valence electrons.

    • Carbon bonds with itself and other elements, allowing an almost unlimited variety of compounds.

  • Versatility in Bonding:

    • Form strong carbon-carbon bonds.

    • Capable of forming three fundamental structures:

      • Straight chains.

      • Rings.

      • Branched chains.

Unique Bonding Properties

  • Long chains formed through carbon-carbon bonds.

  • Formation of various isomers, unique among elements.

Allotropes of Carbon

  • Allotropes: Different structural modifications of an element.

  • Major Allotropes:

    • Diamond:

      • Transparent, hardest substance.

      • Non-conductive.

    • Graphite:

      • Opaque, soft and spongy, good conductor of electricity.

  • Both allotropes are solid and insoluble in water.

Carbon Bonding Mechanism

  • Carbon bonds by sharing electrons, following the octet rule:

    • Must share four electrons to achieve electronic stability.

  • Formation of covalent bonds:

    • Single, double, or triple bonds possible.

Hydrocarbons

  • Definition: Organic compounds containing only carbon and hydrogen.

  • Main source of fuel in industries.

  • Classification:

    • Saturated hydrocarbons (single bonds) - Alkanes.

    • Unsaturated hydrocarbons (at least one double/triple bond) - Alkenes (double), Alkynes (triple).

Naming Hydrocarbons

  1. Determine the type of bond:

    • Single (saturated) vs. multiple (unsaturated).

  2. Classify:

    • Alkanes - "ane"

    • Alkenes - "ene"

    • Alkynes - "yne"

    • Aromatic Hydrocarbon

  3. Count carbon atoms and assign prefix:

    • Meth- (1), Eth- (2), Prop- (3), But- (4), etc.

  4. Examples:

    • Four carbon alkane: Butane.

    • Two carbon alkene: Ethene.

    • Three carbon alkyne: Propyne.

    • Six carbon aromatic: Benzene

Straight Chain Alkanes

  • Defined: Saturated hydrocarbons with single bonds.

  • General Formula: CnH2n+2 (n = number of carbon atoms).

  • Example Calculation for n = 3:

    • C3H8 (Propane): 3 carbon atoms, saturated with the formula.

  • Structural formula representation for propane provided.

Conclusion

  • Reminder to students to engage with questions.

  • Encouragement to like, share, and subscribe for more content.