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Reactions of Alkanes and Cycloalkanes

Reactions of Alkanes and Cycloalkanes. There are two major types of reactions of alkanes and cycloalkanes: Combustion Alkane + Oxygen  Carbon dioxide + water + heat energy Halogenation

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Reactions of Alkanes and Cycloalkanes

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  1. Reactions of Alkanes and Cycloalkanes • There are two major types of reactions of alkanes and cycloalkanes: • Combustion • Alkane + Oxygen  Carbon dioxide + water + heat energy • Halogenation • Alkane + Halogen  Alkyl halide + hydrogen halide

  2. Combustion Reactions General form: Alkane + oxygen  carbon dioxide + water • Examples CH4 + 2O2 CO2 + 2H2O + 9O2 6CO2 + 6H2O

  3. You Try These! • Write the combustion reactions for the following alkanes and cycloalkanes. • Propane • Ethane • Cyclooctane

  4. Answers to You Try These! 1. C3H8 + 5O2 3CO2 + 4H2O 2. 2C2H6 + 7O2 4CO2 + 6H2O 3. C8H16 + 12O2 8CO2 + 8H2O

  5. Cl Halogenation Reactions General Form: Alkane + Halogen  Alkyl halide + Hydrogen halide Requires Heat or Light as a catalyst • Examples: CH4 + Br2  CH3Br + HBr + Cl2  + HCl

  6. You Try These! Write the equation for the following: • Ethane + chlorine  • Propane + bromine  • Cyclobutane + chlorine 

  7. Cl Answers to You Try These! • CH3CH3 + Cl2 CH3CH2Cl + HCl • CH3CH2CH3 + Br2 CH3CHBrCH3 +HBr OR CH3CH2CH3 + Br2 CH3CH2CH2Br +HBr 3. + Cl2  + HCl

  8. Write a balanced equation for each reaction: • A) complete combustion of cyclobutane • B) monobromination of propane • C) complete combustion of ethane • D) monochlorination of butane

  9. Write a balanced equation for each reaction: • A) complete combustion of cyclobutane • 2 C4H10 + 13 O2 8 CO2 + 10 H2O + heat energy • B) monobromination of propane • C3H8 + Br2 C3H7Br + HBr • C) complete combustion of ethane • 2 C2H6 + 7 O2 4 CO2 + 6 H2O + heat energy • D) monochlorination of butane • C4H10 + Cl2 C4H9Cl + HCl

  10. Write a balanced equation for each reaction: • A) complete combustion of decane • B) monochlorination of cyclobutane • C) monobromination of pentane • D) complete combustion of hexane

  11. Write a balanced equation for each reaction: • A) complete combustion of decane • 2 C10H22 + 31 O2 20 CO2 + 22 H2O + heat energy • B) monochlorination of cyclobutane • C4H8 + Cl2 C4H7Cl + HCl • C) monobromination of pentane • C5H12 + Br2 C5H11Br + Hbr • D) complete combustion of hexane • 2 C6H14 + 19 O2 12 CO2 + 14 H2O + heat energy

  12. HOMEWORK • Page 323 #11.59 & 11.60

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