Chemical Bonding | Ionic and Covalent | Grade 9 Science Quarter 2 Week 2

Chemical Bonding

In this video, the instructor discusses chemical bonding and its different types. The lesson starts with a short activity to identify metals and non-metals from the periodic table of elements. Then, the instructor explains what compounds are and introduces the concept of chemical bonding. Finally, the two main types of chemical bonding - ionic and covalent - are discussed in detail.

Identifying Metals and Non-Metals

• To identify if an element is a metal or non-metal, look at the periodic table of elements.

• Elements are grouped as metals (red), metalloids (yellow), and non-metals (blue).

• Example: Lithium is a metal element, neon is a non-metal element, while boron is a metalloid element.

Ionic Bonding

• Ionic bonding occurs between metals and non-metals through complete transfer of electrons from one atom to another.

• Atoms bond to become stable. When a metal element bonds with a non-metal element, ions are formed.

• Ions are classified as cations (positive charge) or anions (negative charge).

• Example: Sodium chloride where sodium is metal and chlorine is non-metal.

Covalent Bonding

• Covalent bonding involves sharing electron pairs between atoms.

• It commonly occurs when two non-metals bond together.

• There are two types of covalent bonding: non-polar covalent bond (electrons shared equally), polar covalent bond (electrons shared unequally).

Overall, this lesson provides a basic understanding of chemical bonding and its different types.

Properties of Ionic and Covalent Compounds

In this section, the properties of ionic and covalent compounds are discussed.

Hardness and Melting/Boiling Points

• Ionic compounds are hard and brittle, while covalent compounds are more flexible.

• Ionic compounds have higher melting and boiling points than covalent compounds.

Malleability and Ductility

• Both ionic and covalent compounds are not malleable or ductile.

Volatility and Solubility

• Covalent compounds have higher volatility than ionic compounds.

• Ionic compounds are soluble in water but insoluble in organic solvents, while covalent compounds are insoluble in water but soluble in organic solvents.

Conclusion

This section concludes the lesson on chemical bonding, specifically on ionic and covalent bonding.

• The properties of ionic and covalent bonds were discussed.

• The video ends with a goodbye message.