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What is a Coordinate Bond (one-sided electron sharing)?
Grade Level:
Class 7
Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics
Definition
What is it?
A coordinate bond is a special type of covalent bond where both the shared electrons come from only one of the atoms. It's like one friend bringing both samosas to share with another friend who didn't bring any, but they both enjoy eating them together.
Simple Example
Quick Example
Imagine you and your friend are playing a video game. For a special power-up, you need two coins. You have both coins, and your friend has none. You share both your coins with your friend so you both can use the power-up together. Here, you are like the atom donating both electrons, and your friend is the atom accepting them to share.
Worked Example
Step-by-Step
Let's understand how a coordinate bond forms with an example like the reaction between Ammonia (NH3) and a Hydrogen ion (H+).
1. Ammonia (NH3) has a Nitrogen atom with one lone pair of electrons (two electrons not involved in bonding).
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2. A Hydrogen ion (H+) is a hydrogen atom that has lost its only electron, so it needs two electrons to complete its outermost shell.
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3. The Nitrogen atom in NH3 'donates' its lone pair of electrons to the H+ ion.
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4. Both the Nitrogen atom and the Hydrogen ion now 'share' these two electrons.
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5. This sharing forms a new bond, called a coordinate bond, resulting in the Ammonium ion (NH4+).
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6. In NH4+, one of the N-H bonds is a coordinate bond, where Nitrogen provided both electrons.
Why It Matters
Coordinate bonds are crucial in making many important chemicals, like the catalysts used in making petrol or plastics, and even in some medicines. Understanding them helps scientists in Biotechnology design new drugs and engineers in Space Technology create advanced materials.
Common Mistakes
MISTAKE: Thinking a coordinate bond is completely different from a covalent bond. | CORRECTION: A coordinate bond IS a type of covalent bond. The only difference is that in a regular covalent bond, each atom contributes one electron to the shared pair, but in a coordinate bond, one atom contributes both electrons.
MISTAKE: Believing the donated electrons are 'given away' completely. | CORRECTION: The electrons are not given away; they are still shared between both atoms, just like in any covalent bond. The 'donation' refers to where the shared pair originated.
MISTAKE: Confusing a coordinate bond with an ionic bond. | CORRECTION: In an ionic bond, electrons are completely transferred from one atom to another, forming ions. In a coordinate bond, electrons are shared, not transferred.
Practice Questions
Try It Yourself
QUESTION: In a coordinate bond, how many electrons are shared, and how many atoms contribute them? | ANSWER: Two electrons are shared, and only one atom contributes both of them.
QUESTION: If a water molecule (H2O) can form a coordinate bond with a H+ ion, what will be the resulting ion? | ANSWER: H3O+ (Hydronium ion)
QUESTION: Why is a coordinate bond also sometimes called a 'dative bond'? | ANSWER: It's called a dative bond because 'dative' comes from the Latin word 'dare', which means 'to give'. This refers to one atom 'giving' or 'donating' both electrons for sharing.
MCQ
Quick Quiz
Which statement correctly describes a coordinate bond?
Electrons are completely transferred from one atom to another.
Each atom contributes one electron to form a shared pair.
One atom contributes both electrons to form a shared pair.
No electrons are shared; atoms are held together by electrostatic forces.
The Correct Answer Is:
C
In a coordinate bond, one specific atom provides both electrons that are then shared between two atoms. Options A describes ionic bonds, B describes regular covalent bonds, and D describes no bond formation.
Real World Connection
In the Real World
Coordinate bonds are essential in understanding how certain enzymes (biological catalysts) work in our bodies, helping with digestion or other life processes. They are also found in many complex compounds used in industrial processes, like making fertilizers for farms or even in the pigments that give colours to paints and dyes.
Key Vocabulary
Key Terms
LONE PAIR: A pair of electrons in the outermost shell of an atom that are not involved in bonding. | COVALENT BOND: A chemical bond formed by the sharing of electron pairs between atoms. | DONOR ATOM: The atom that provides both electrons for the shared pair in a coordinate bond. | ACCEPTOR ATOM: The atom that accepts the shared pair of electrons from the donor atom in a coordinate bond.
What's Next
What to Learn Next
Now that you understand coordinate bonds, you can explore other types of chemical bonds like metallic bonds, which are important for understanding how metals like copper or iron conduct electricity. This will help you build a stronger foundation in Chemistry.
