4E SciChem Topic 17 - Alkanes & Alkenes

Which statement about alkanes is correct?

• A molecule of propane contains two carbon atoms

• The general formula is C_nH_2n.

• The products of complete combustion are carbon monoxide and water.

• They react with chlorine in a substitution reaction.

The structure of a monomer is shown.

What is the structure of the polymer formed by this monomer?

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• 
• 
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Which statement is correct for both alkanes and alkenes?

• Both are unsaturated hydrocarbons.

• Both contain a double bond.

• Both decolourise aqueous bromine water.

• Both undergo complete combustion producing carbon dioxide and water.

Which hydrocarbons are members of the same homologous series?

• C₅H₁₀ and C₅H₈

• C₅H₁₀ and C₅H₁₂

• CH₄ and C₂H₄

• CH₄ and C₆H₁₄

A section of an addition polymer is shown.

Which row describes the monomer used to make this polymer?

• A

• B

• C

• D

The alkanes are a homologous series of compounds with the general formula C_nH_2n+2.

Which row describes the changes as the value of n increases?

• A

• B

• C

• D

• A

• B

• C

• D

Which hydrocarbon is an alkane?

• C₆H₆

• C₆H₁₀

• C₇H₁₄

• C₇H₁₆

The diagram shows part of the structure of an addition polymer.

Which monomer is used to make this polymer?

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• 
• 
• 

Alkanes are a homologous series of compounds.

The properties of the alkanes change as the size of molecules increases.

How do the properties change?

• The boiling point increases and the flammability increases.

• The flammability decreases and the viscosity increases.

• The flammability increases and the melting point increases.

• The viscosity increases and the boiling point decreases.