Ethyne Experiment(Complete) Flashcards

1
Q

How many pi and sigma bonds do triple bonds have?

A

One sigma.

Two pi.

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2
Q

State the equation of the production of ethyne in a laboratory.

A

CAC2 + 2H2O = CA(OH)2 +C2H2

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3
Q

Draw a diagram of the production of ethyne in a laboratory.

A

In manual.

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4
Q

Describe the appearance of calcium dicarbide.

A

Grey lumpy solid.

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5
Q

What does calcium dicarbide do when it comes in contact with water?

A

Reacts exothermically with water.

It fizzes and produces steam.

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6
Q

What is CA(OH)2?

A

Calcium hydroxide.

A white powder with a greater volume.

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7
Q

Why is ethyne bubbled through acidified copper II sulphate solution.

A

To remove impurities such as phosphine gas (PH3)

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8
Q

How is phosphine gas produced?

A

When calcium phosphide (CA3P2) reacts with water.

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9
Q

What are the main properties of ethyne?

A

It is colourless.
Has a sickly sweet smell.
Non-polar so is insoluble in water.

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10
Q

What happens when ethyne burns in air?

A

Produces a very smoky yellow flame.

In excess pure oxygen, it burns with a very hot flame.

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11
Q

What is a major use of ethyne?

A

Oxyacetylene burner cuts steel.

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12
Q

Give the combustion reaction of ethyne.

A

C2H2 + 2.5O2 = 2CO2 + H2O

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13
Q

How do you show that ethyne is unsaturated?

A

Shake with bromine water-turns from red/brown to colourless.

Shake with acidified KMNO4- turns from pink to colourless.

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14
Q

Write an equation for the reaction taking place between ethyne and bromine.

A

C2H2 + Br2 = C2H2Br2

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15
Q

Name the product produces when ethyne and bromine react.

A

Dibromoethene.

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