Class 10 Science - ICSE-CHEMISTRY
Chemical Bonding
The Chemical Bonding chapter in Class 10 ICSE Chemistry explores how and why atoms combine to form molecules and compounds, focusing on achieving a stable noble gas electronic configuration. You will study electrovalent (ionic) bonding through electron transfer, covalent bonding through electron sharing, and coordinate (dative) bonding. The chapter details the distinct physical properties of electrovalent and covalent compounds, such as melting points, boiling points, and electrical conductivity. Mastering this chapter is crucial for scoring high in board exams, as it forms the foundational building block for understanding chemical reactions, periodicity, and metallurgy in later chapters.
Start Learning FreeKey Concepts
Octet Rule
Atoms tend to react to gain, lose, or share electrons to achieve a stable octet of eight electrons in their outermost valence shell, mimicking the nearest noble gas.
Electrovalent (Ionic) Bonding
A chemical bond formed by the complete transfer of one or more valence electrons from a metal to a non-metal, resulting in electrostatic attraction between oppositely charged ions.
Covalent Bonding
A bond formed by the mutual sharing of one or more pairs of electrons between two non-metal atoms so that both achieve stability.
Coordinate (Dative) Bonding
A special type of covalent bond where the shared pair of electrons is contributed entirely by only one of the participating atoms.
Properties of Compounds
Electrovalent compounds have high melting points and conduct electricity in molten or aqueous states, whereas covalent compounds have low melting points and are poor conductors.
Important Formulas
Board Exam Info
In the ICSE Chemistry Class 10 Board Examination, this chapter typically carries around 8 to 12 marks. Common question types include drawing electron dot diagrams (Lewis structures) for molecules like NaCl, H2O, and NH3, explaining the formation of coordinate bonds in hydronium and ammonium ions, and differentiating between the physical properties of ionic and covalent compounds.
Frequently Asked Questions
Why do atoms form chemical bonds?
Atoms form chemical bonds to lower their potential energy and achieve a stable electronic configuration similar to the nearest noble gas, usually having 8 electrons in their valence shell.
Do covalent compounds conduct electricity?
No, most covalent compounds do not conduct electricity because they consist of neutral molecules and lack free mobile ions or electrons, with rare exceptions like polar covalent HCl in water.
What is the difference between a covalent bond and a coordinate bond?
In a normal covalent bond, both participating atoms contribute equally to the shared electron pair. In a coordinate bond, the shared pair is donated entirely by a single atom having a lone pair.
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