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What is sp Hybridisation (Basic)?
Grade Level:
Class 10
AI/ML, Physics, Biotechnology, Space Technology, Chemistry, Engineering, Medicine
Definition
What is it?
sp hybridisation is when one 's' atomic orbital and one 'p' atomic orbital mix together to form two new, identical hybrid orbitals. These new orbitals are called 'sp' hybrid orbitals and they arrange themselves linearly, 180 degrees apart, around the central atom.
Simple Example
Quick Example
Imagine you have two different types of cricket bats: one 's' bat (round and short) and one 'p' bat (long and thin). When you mix them, you don't get a short bat and a long bat anymore. Instead, you get two identical 'sp' bats, each a mix of the original types, ready to hit the ball in a specific direction. They are like two new, balanced bats that give you a straight shot.
Worked Example
Step-by-Step
Let's find the hybridisation of the carbon atom in Acetylene (C2H2).
1. Identify the central atom: In C2H2, each Carbon (C) atom is a central atom.
---2. Count the number of sigma bonds around one Carbon atom: Each Carbon atom forms one sigma bond with the other Carbon atom and one sigma bond with a Hydrogen atom. Total sigma bonds = 2.
---3. Count the number of lone pairs on the Carbon atom: Carbon has no lone pairs in C2H2.
---4. Add the number of sigma bonds and lone pairs: 2 (sigma bonds) + 0 (lone pairs) = 2.
---5. This sum (2) tells us the number of hybrid orbitals needed. Since we need 2 hybrid orbitals, we mix one 's' orbital and one 'p' orbital.
---6. Therefore, the hybridisation of each Carbon atom in C2H2 is sp.
ANSWER: sp hybridisation.
Why It Matters
Understanding sp hybridisation helps scientists predict how molecules will look and behave. This is crucial in fields like Biotechnology to design new medicines, in Engineering to create strong materials, and in Chemistry to synthesise new compounds. It's a foundational concept for innovators!
Common Mistakes
MISTAKE: Counting pi (π) bonds when determining hybridisation | CORRECTION: Only count sigma (σ) bonds and lone pairs around the central atom. Pi bonds are formed by unhybridised p-orbitals.
MISTAKE: Assuming all atoms in a molecule have the same hybridisation | CORRECTION: Hybridisation is determined for each central atom individually. Different central atoms in the same molecule can have different hybridisations.
MISTAKE: Confusing the number of hybrid orbitals with the type of hybridisation (e.g., thinking 2 means sp2) | CORRECTION: If the sum of sigma bonds + lone pairs is 2, it's sp (1 s + 1 p). If it's 3, it's sp2 (1 s + 2 p). If it's 4, it's sp3 (1 s + 3 p).
Practice Questions
Try It Yourself
QUESTION: How many hybrid orbitals are formed during sp hybridisation? | ANSWER: Two
QUESTION: What is the bond angle between the two sp hybrid orbitals? | ANSWER: 180 degrees
QUESTION: A molecule has a central atom bonded to two other atoms with single bonds and has no lone pairs. What is its hybridisation? | ANSWER: sp (Because 2 sigma bonds + 0 lone pairs = 2, which corresponds to sp hybridisation)
MCQ
Quick Quiz
Which of the following molecules has a central atom with sp hybridisation?
Methane (CH4)
Ethene (C2H4)
Ethyne (C2H2)
Water (H2O)
The Correct Answer Is:
C
In Ethyne (C2H2), each carbon atom forms one sigma bond with another carbon and one sigma bond with a hydrogen, totaling 2 sigma bonds. This corresponds to sp hybridisation. Methane is sp3, Ethene is sp2, and Water is sp3.
Real World Connection
In the Real World
Many everyday materials contain molecules with sp hybridised atoms. For example, in the production of PVC pipes used for plumbing in homes across India, the vinyl chloride monomer involves carbon atoms with sp2 hybridisation, but understanding sp hybridisation is key to understanding the full picture of carbon bonding. Also, in advanced materials, the linear arrangement from sp hybridisation is sometimes used to create strong, rigid structures.
Key Vocabulary
Key Terms
Atomic Orbital: A region around the nucleus where electrons are likely to be found. | Hybrid Orbital: A new orbital formed by mixing atomic orbitals. | Sigma Bond: A strong single covalent bond formed by head-on overlap of orbitals. | Linear Geometry: A molecular shape where atoms are arranged in a straight line. | Central Atom: The atom in a molecule to which other atoms are bonded.
What's Next
What to Learn Next
Great job understanding sp hybridisation! Next, explore 'sp2 Hybridisation' and 'sp3 Hybridisation'. You'll see how different numbers of orbitals mix to create new shapes and properties, just like learning different types of cricket shots after mastering a straight drive!
