Edexcel IGCSE Chemistry Topic 4: Organic Chemistry Alkanes Notes

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Questions and Answers

Why are alkanes classified as saturated hydrocarbons?

  • Each carbon has formed its maximum of 4 single bonds (correct)
  • They contain C=C double bonds
  • They consist of triple bonds
  • They have an unsaturated structure

How many single bonds does each carbon in an alkane typically form?

  • 4 (correct)
  • 1
  • 2
  • 3

Which of the following alkanes is correctly matched with its formula?

  • Propane - CH3CH3CH3
  • Ethane - CH3CH3 (correct)
  • Butane - CH3CH2CH2CH3
  • Methane - CH3CH3

What is the general formula for alkanes?

<p>CnH2n+2 (D)</p> Signup and view all the answers

What type of bonds are absent in alkanes?

<p>Double bonds (C)</p> Signup and view all the answers

Which alkane has the displayed formula CH3CH2CH2CH2CH3?

<p>Pentane (A)</p> Signup and view all the answers

What is the general formula for alkanes with 'n' carbon atoms?

<p>CnH2n+2 (B)</p> Signup and view all the answers

Why are alkanes classified as saturated hydrocarbons?

<p>Their carbons have formed maximum single bonds (D)</p> Signup and view all the answers

Which alkane is represented by the displayed formula CH3CH2CH3?

<p>Propane (A)</p> Signup and view all the answers

How many carbon atoms are present in a molecule of butane?

<p>4 (D)</p> Signup and view all the answers

What is the structural formula of pentane?

<p>CH3CH2CH2CH3 (A)</p> Signup and view all the answers

Which alkane has the molecular formula C2H6?

<p>Ethane (C)</p> Signup and view all the answers

How many single bonds does a carbon atom typically form in alkanes?

<p>4 (D)</p> Signup and view all the answers

Which alkane has the displayed formula CH3CH2CH2CH3?

<p>Butane (D)</p> Signup and view all the answers

What type of bonding makes alkanes saturated hydrocarbons?

<p>Single bonds (C)</p> Signup and view all the answers

Flashcards

Saturated hydrocarbon definition

A hydrocarbon containing only single bonds between carbon atoms.

Alkane carbon bond number

Each carbon atom forms four single bonds in an alkane.

Ethane formula

CH3CH3

General alkane formula

CnH2n+2

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Alkane bond type

Alkanes have only single bonds.

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Pentane displayed formula

CH3CH2CH2CH2CH3

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Butane displayed formula

CH3CH2CH2CH3

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Propane displayed formula

CH3CH2CH3

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Butane carbon number

4

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Pentane structural formula

CH3CH2CH2CH2CH3

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Ethane molecular formula

C2H6

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Alkane Carbon Bonds

Four

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Alkane saturation bonding

Single Bonds

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Alkane general formula carbons

CnH2n+2 for "n" carbons

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Saturated hydrocarbon reason

Each carbon has its maximum number of single bonds

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