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9.6(c) - Ethyne (C₂H₂)

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Introduction to Ethyne

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Teacher
Teacher

Today we will learn about ethyne, also known as acetylene, which is the simplest alkyne with the molecular formula C₂H₂. Can anyone tell me what makes alkynes unique?

Student 1
Student 1

Alkynes have triple bonds, right?

Teacher
Teacher

Exactly! Alkynes are distinguished by having at least one triple bond. Ethyne is our first example of an alkyne. Let's remember its formula: C₂H₂. You can think of it like ‘carbon two hydrogen two’ to memorize it easily.

Student 2
Student 2

How do we produce ethyne?

Teacher
Teacher

Great question! Ethyne can be created by the reaction of calcium carbide with water, giving ethyne and calcium hydroxide as products. This reaction can be summarized as: CaC₂ + 2H₂O → C₂H₂ + Ca(OH)₂.

Properties of Ethyne

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Teacher
Teacher

Now, let's discuss the properties of ethyne. Ethyne is a colorless gas and has a slightly sweet odor. Can anybody think of where we might encounter ethyne in everyday life?

Student 3
Student 3

Isn't it used in welding?

Teacher
Teacher

Correct! Ethyne is widely used as a fuel in welding. Its high temperature flame makes it ideal for cutting and welding. Now, what about its reactivity? What happens when ethyne undergoes combustion?

Student 4
Student 4

It burns to produce carbon dioxide and water, right?

Teacher
Teacher

Yes! The complete combustion of ethyne is represented as: 2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O + heat. This reaction releases a significant amount of energy.

Introduction & Overview

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Quick Overview

Ethyne (C₂H₂) is the first member of the alkynes and can be produced by the reaction of water with calcium carbide.

Standard

Ethyne (C₂H₂) is a key organic compound categorized as the simplest alkyne. This section covers its formation, properties, and its significance in organic chemistry, particularly as the first alkyne and its production process from calcium carbide and water.

Detailed

Ethyne (C₂H₂), the simplest member of the alkyne family, plays an essential role in organic chemistry. It is characterized by its triple bond between carbon atoms, resulting in unique properties distinct from other hydrocarbons. Ethyne is formed through a chemical reaction involving calcium carbide (CaC₂) and water (H₂O), yielding ethyne and calcium hydroxide (Ca(OH)₂) as products. Understanding ethyne's structure and formation is crucial for grasping the broader concepts of hydrocarbons and alkynes, which are fundamental to organic chemistry.

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Audio Book

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Introduction to Ethyne

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● Ethyne (C₂H₂)
● First member of alkynes

Detailed Explanation

Ethyne, also known as acetylene, is the simplest alkyne, a category of hydrocarbons. Alkynes are characterized by having at least one triple bond between carbon atoms. Ethyne consists of two carbon atoms connected by a triple bond and each carbon is bonded to one hydrogen atom. It serves as the most fundamental example of this family of compounds.

Examples & Analogies

Think of ethyne like a simple two-person team in a tournament where teamwork (the triple bond) is key to their success. Just like how they work together closely to win, the two carbon atoms in ethyne are tied together by a strong triple bond.

Formation of Ethyne

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● Formed by reaction of water with calcium carbide:
CaC₂ + 2H₂O → C₂H₂ + Ca(OH)₂

Detailed Explanation

Ethyne is produced through a chemical reaction that involves calcium carbide (CaC₂) and water (H₂O). When these two react, ethyne is generated as one of the products along with calcium hydroxide (Ca(OH)₂). This reaction is often utilized in industrial settings to create ethyne for various applications, including welding and as a precursor for producing other chemicals.

Examples & Analogies

Imagine calcium carbide as a sponge that, when it meets water, releases bubbles of gas. Those bubbles are like ethyne, forming quickly as the calcium carbide interacts with the moisture, showing how the right ingredients can produce something new and useful.

Definitions & Key Concepts

Learn essential terms and foundational ideas that form the basis of the topic.

Key Concepts

  • Ethyne (C₂H₂): The simplest alkyne with a triple bond.

  • Formation of Ethyne: Produced by the reaction of calcium carbide with water.

  • Properties of Ethyne: Colorless gas, used in welding, burns to produce CO₂ and H₂O.

Examples & Real-Life Applications

See how the concepts apply in real-world scenarios to understand their practical implications.

Examples

  • Ethyne is produced when calcium carbide reacts with water: CaC₂ + 2 H₂O → C₂H₂ + Ca(OH)₂.

  • During combustion, ethyne burns to create carbon dioxide and water: 2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O + heat.

Memory Aids

Use mnemonics, acronyms, or visual cues to help remember key information more easily.

🎵 Rhymes Time

  • Ethyne's a gas, it's true, with two carbons in a view.

📖 Fascinating Stories

  • Once upon a time, in a chemistry lab, calcium carbide met water and poof! - out came ethyne, shining bright in the flame.

🧠 Other Memory Gems

  • C₂H₂: 'Carbon-Coupling to Hydrogen, too!' to remember ethyne's formula.

🎯 Super Acronyms

E.T.H.Y.N.E

  • Ethyne - The Hydrocarbon Yielding Novel Energy.

Flash Cards

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Glossary of Terms

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  • Term: Ethyne

    Definition:

    The simplest alkyne with the formula C₂H₂, characterized by a triple bond between carbon atoms.

  • Term: Calcium Carbide

    Definition:

    A chemical compound used in the production of ethyne through its reaction with water.

  • Term: Triple Bond

    Definition:

    A type of covalent bond where three pairs of electrons are shared between two atoms.