LC chemistry reactions

  1. Why do alkanes only undergo substitution reactions?
    They are not really reactive

    Already have single bonds and cannot become stronger or stabler structurally
  2. Write down the equation of the reaction between methane and chlorine?
    CL+CH4=
    CL+CH4= CH3CL+HCL

    chloromethane and hydrogen chloride
  3. Define homolytic fission
    The breaking of a covalent bond with one of the bonded electrons going to each atom, forming two radicals
  4. What is a photochemical reaction?
    A reaction brought about by light
  5. What are free radicals?
    any atom or group of atoms with unpaired electrons
  6. What lead compound increases the rate of the reaction?
    Tetramethyl lead Pb(CH3)4
  7. What happens when ultraviolet light is shined on a test tube containing some cyclohexane and bromine?
    • The solution will now go colorless
    • ¬†
    • A substitution reaction has occurred between bromine and cyclohexane to from bromocyclohexane
  8. What is a substitution reaction?
    A chemical reaction in which an atom or group of atoms in a molecule are replaced by another atom or group of atoms
  9. What is the mechanism?
    The detailed step by step description of how the overall reaction occurs
  10. What is the reaction mechanism?
    Theories put forward in order to explain how a particular reaction occurs
  11. What are condensation reactions?
    Reactions in which water is formed
  12. What is the use of fully halogenated alkanes
    • As flame retardants
    • CBrCIF2
  13. What is saponifcation
    Base hydrolysis of an Esther
  14. Write down the equation to represent the reaction that is taking place in soap production.
    Stearic acid+Glycerol (propane-1,2,3triol)=glyceryl tristearate

    • glyceryl tristearate +3NaOH= Sodium stearate (soap) + Glycerol (propane=1,2,3-triol)
  15. What is glycerol used to create?
    The explosive nitroglycerine
  16. In the production of soap, why is ethanol used?
    It acts as a solvent for the oil or lard
  17. In the production of soap, why are anti-bumping chips used?
    Help boiling to take place more smoothly
  18. In the production of soap, what is the purpose of refluxing?
    In order to bring the reaction to completion, maximizing the yield of soap

    there is no loss of the solvent ethanol as the ethanol vapor
  19. In the production of soap, why is it important to remove ethanol?
    makes it easier to isolate the soap
  20. What are addition reactions?
    One in which two or more molecules react together to form a single molecule
  21. What is a hydrogenation reaction?
    hydrogen reacting with an unsaturated substance
  22. Uses of the products of addition reactions of ethene, 1,2-dibromoethane
    Fumigant for treating timber logs against termites and beetles
  23. Uses of the products of addition reactions of ethene, 1,2-dichloroethane
    used to manufacture chloroethane

    Polyvinyl vinyl chloride (PVC), plastic
  24. Uses of the products of addition reactions of ethene, chloroethane
    ethane + hydrogen chloride
    Used in dentistry as a means of diagnosing  a "dead tooth"
  25. What is heterolytic fission?
    the breaking of a bond so that the two electrons end up on one atom
Author
cat126
ID
351634
Card Set
LC chemistry reactions
Description
questions from text book and workbook
Updated