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level: Alkanes and Alkenes

Questions and Answers List

level questions: Alkanes and Alkenes

QuestionAnswer
What is a Homologous Series?-This is simply a Group that just has Similar Chemical Structures
What are Alkanes?-This is a Homologous Series of Saturated Hydrocarbons [Just has Carbons and Hydrogen Atoms]
List the first 4 Alkanes, from the Smallest Size upwards-Methane: CH₄ -Ethane: C₂H₆ -Propane: C₃H₈ -Butane: C₄H₁₀
What does it mean if the Alkanes are Saturated?-They have formed the Maximum Bonds they Possibly can with Other Atoms [Single Bonds]
What is the General Formula for Alkanes?-Its simply CₓH₂ₓ₊₂ -X is simply the Term.
What happens to Alkanes in a Complete Combustion? Give the Equation-They simply Burn in Oxygen to make Carbon Dioxide and Water -C₂H₆ + 3.5O₂ --> 2CO₂ + 3H₂O
What happens to Alkanes in a Incomplete Combustion? Why can it happen? Give the Equation-This is when not enough Oxygen is Present, creating Carbon Monoxide -C₂H₆ + 2.5O₂ --> 2CO + 3H₂O
What are Alkenes?-This is a Homologous Series that has at least a Double Bond with Carbon
What does it mean if Alkenes are Unsaturated?-This is because they can make more Bonds, as the Double Bond can Break up allowing two more Atoms to join up [Hydrogen, Chlorine..]
Give the First 4 Alkenes, starting from the Smallest.-Ethene, C₂H₄ -Propene, C₃H₆ -Butene, C₄H₈ -Pentene, C₅H₁₀
What is the General Formula for Alkenes?-CₓH₂ₓ
How can you Test for Alkenes? Give the Equation-Simply just add Bromine Water to it, which will go Colourless if it Reacts with an Alkene. -This is due to the Double Bond being able to Open Up and and make Bonds with the Bromine -C₂H₄ + Br₂--> C₂H₄Br₂ -Colourless + Orange --> Colourless
What happens in Hydrogenation, with the Alkene? Give the Equation when it happens with Ethene.-This is simply the Process that has Hydrogen react with Alkenes -Ethene + Hydrogen --> Ethane -C₂H₄ + H₂ ---> C₂H₆