Day 1: Chemical Bonding | Secondary Stage Science | Apex Institute of Maths and Sciences

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Day 1: Chemical Bonding | Secondary Stage Science | Apex Institute of Maths and Sciences

Day 1: Chemical Bonding ⚡

Secondary Stage Science | Apex Institute of Maths and Sciences

🎯 1. Concept: Stability & The Octet Rule

Atoms seek stability by completing their outermost shell (Valence Shell) with 8 electrons. This is known as the Octet Rule.

  • Ionic Bonding: Occurs when a metal transfers electrons to a non-metal. This creates positive and negative ions held by strong electrostatic forces. (Example: NaCl)
  • Covalent Bonding: Occurs when non-metals share pairs of electrons to complete their octets. (Example: H2O, CO2)

💡 2. Physical Properties of Bonds

Ionic Compounds: High melting points; conduct electricity when dissolved in water.
Covalent Compounds: Generally lower melting points; usually non-conductors.

*Key Fact: Ionic bonds are held by full electrical charges, making them much harder to break than covalent shared-electron clouds.

🌍 3. Science in Our Daily Life

Scenario: Why is salt-water a conductor but sugar-water is not? Salt (NaCl) is an Ionic Compound. When dissolved, it breaks into Na+ and Cl– ions that carry electric current through the water! Sugar is covalent and does not form ions.

📝 4. Home Research Task

Research the **Electron Dot Structure** for Magnesium Chloride (MgCl2). Observe how one Magnesium atom transfers its 2 valence electrons to two different Chlorine atoms.

✅ 5. Day 1 Advanced Assessment

Use the information provided in the sections above to answer these 10 questions.

Easy
1. How many electrons do atoms usually seek in their outer shell for stability?
Solution: This is the Octet Rule described in Part 1.
Easy
2. What type of bond is formed when electrons are transferred?
Solution: Ionic bonding involves the transfer of electrons (Part 1).
Easy
3. Covalent bonds typically form between two ________.
Solution: Part 1 states covalent bonds occur between non-metals.
Easy
4. Which of these is an example of a covalent molecule?
Solution: Water (H2O) is given as a covalent example in Part 1.
Medium
5. Why do ionic compounds have high melting points?
Solution: Full electrical charges make the bonds harder to break (Part 2).
Medium
6. When NaCl dissolves in water, it breaks into ________.
Solution: It breaks into Na+ and Cl– ions (Part 3).
Medium
7. Which type of compound is usually a non-conductor of electricity?
Solution: Covalent compounds are generally non-conductors (Part 2).
Medium
8. In NaCl, which element becomes the positive ion?
Solution: Sodium becomes Na+ (Part 3).
Hard
9. Assertion: Sugar (covalent) water doesn’t conduct electricity.
Reason: It does not form ions in solution.
Solution: Current requires ions to flow; sugar does not produce them (Part 3).
Hard
10. Magnesium (Mg) transfers its valence electrons to ________ Chlorine atoms.
Solution: MgCl2 involves two chlorine atoms (Part 4).
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