Ethyne Experiment(Complete) Flashcards
How many pi and sigma bonds do triple bonds have?
One sigma.
Two pi.
State the equation of the production of ethyne in a laboratory.
CAC2 + 2H2O = CA(OH)2 +C2H2
Draw a diagram of the production of ethyne in a laboratory.
In manual.
Describe the appearance of calcium dicarbide.
Grey lumpy solid.
What does calcium dicarbide do when it comes in contact with water?
Reacts exothermically with water.
It fizzes and produces steam.
What is CA(OH)2?
Calcium hydroxide.
A white powder with a greater volume.
Why is ethyne bubbled through acidified copper II sulphate solution.
To remove impurities such as phosphine gas (PH3)
How is phosphine gas produced?
When calcium phosphide (CA3P2) reacts with water.
What are the main properties of ethyne?
It is colourless.
Has a sickly sweet smell.
Non-polar so is insoluble in water.
What happens when ethyne burns in air?
Produces a very smoky yellow flame.
In excess pure oxygen, it burns with a very hot flame.
What is a major use of ethyne?
Oxyacetylene burner cuts steel.
Give the combustion reaction of ethyne.
C2H2 + 2.5O2 = 2CO2 + H2O
How do you show that ethyne is unsaturated?
Shake with bromine water-turns from red/brown to colourless.
Shake with acidified KMNO4- turns from pink to colourless.
Write an equation for the reaction taking place between ethyne and bromine.
C2H2 + Br2 = C2H2Br2
Name the product produces when ethyne and bromine react.
Dibromoethene.