Organic Chemistry EQE

Crude oil vapour passes up the column.

Each fraction ​ (a)   at a different level.

• condenses
• dissolves
• freezes
• melts

Why do the fractions separate?

• The fractions have different boiling points.

• The fractions have different flammability.

• The fractions have different melting points.

• The fractions have different viscosity.

Name the alkane

Methane (CH4) is an alkane.

What is the general formula for alkanes?

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Alkanes burn in oxygen.

Balance the equation for methane burning.

​ ​ ​ (a)   CH₄ +​ (b)   O₂ → ​ (c)   CO₂ + ​ (d)   H₂O

• 1
• 2
• 3
• 4

Ethene is an alkene.

Which reagent is used to test for alkenes?

• Anhydrous copper sulfate

• Bromine water

• Damp litmus paper

• Limewater

Large hydrocarbon molecules can be cracked to produce smaller, more useful molecules.

Alkanes and alkenes are produced when hydrocarbons are cracked.

Give two conditions used for cracking.

• Low temperature

• High temperature

• Steam

• Low pressure

• High oxygen

Complete the diagram

• CH₂CH₃

• CH₂CH₂

• CHCH₃

• CH₄

Butane burns in oxygen.

Complete the word equation for the complete combustion of butane.

butane + ​ (a)   → ​ (b)   + water

• oxygen
• carbon dioxide
• carbon monoxide
• nitrogen

Ethene is an alkene.

Give a test for alkenes.

Give the result of the test if an alkene is present.

• Bromine Water; Orange to colourless

• Bromine Water; Colourless to orange

• Limewater; Clear to cloudy

• Limewater; Cloudy to clear