Lesson Plan: C2.2.05


LESSON PLAN
Teacher Subject Period Date Year Ability LSA/Other Support
Science

Context and
Landmark
Assessment		 C2.2.05
Landmark Assessment: Progress Observation Opportunity
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Lesson Title: Today we are learning about
How do alkenes differ from alkanes?
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Focus on Knowledge, Skills and Understanding
Success Criteria: You will show your learning by...
  1. Alkenes are hydrocarbons with a double carbon-carbon bond.
  2. The general formula for the homologous series of alkenes is CnH2n. Recognise substances that are alkenes from their names or from given formulae in these forms.
  3. Alkene molecules are unsaturated because they contain two fewer hydrogen atoms than the alkane with the same number of carbon atoms.
  4. Students should be able to describe the reactions and conditions for the addition of water alkenes
  5. Students should be able to describe the reactions and conditions for the addition of halogens to alkenes
  6. The first four members of the homologous series of alkenes are ethene, propene, butene and pentene.
  7. Alkene molecules can be represented in the following forms: C3H6 or displayed formula
  8. Students do not need to know the names of individual alkenes other than ethene, propene, butene and pentene.
  9. Alkenes are hydrocarbons with the functional group C=C.
  10. It is the generality of reactions of functional groups that determine the reactions of organic compounds.
  11. Alkenes react with oxygen in combustion reactions in the same way as other hydrocarbons, but they tend to burn in air with smoky flames because of incomplete combustion.
  12. Alkenes react with hydrogen, water and the halogens, by the addition of atoms across the carbon-carbon double bond so that the double bond becomes a single carbon-carbon bond.
  13. Students should be able to describe the reactions and conditions for the addition of hydrogen to alkenes
  14. Students should be able to describe the reactions and conditions for the addition of hydrogen to alkenes
  15. Students should be able to draw fully displayed structural formulae of the first four members of the alkenes and the products of their addition reactions with hydrogen, water, chlorine, bromine and iodine.
Think about how you can match the needs of ALL students
Keywords:
  • Organic: compounds containing carbon other than simple binary compounds and salts and chiefly or ultimately of biological origin. (1)
  • Halogen: any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17) of the periodic table. They are reactive non-metallic elements which form strongly acidic compounds with hydrogen from which simple salts can be made. (1)
  • Unsaturated: organic molecules having carbon–carbon double or triple bonds and therefore not containing the greatest possible number of hydrogen atoms. (1)
  • with the same functional group but differing in composition by a fixed group of atoms. (1)
  • Homologous: a series of chemical compounds (1)
Links: Literacy, Numeracy, SMSC, British values
Memory Anchor:

AFL/Key Questions:
  1. What is the structure of an alkene like?
    Alkenes are hydrocarbons (molecules made up of only hydrogen and carbon) with a double carbon-carbon bond.
  2. What is the general formula for the homologous series of alkenes?
    The general formula for the homologous series of alkenes is CnH2n.
  3. Why are alkene molecules called unsaturated molecules?
    Alkene molecules are unsaturated because they contain two fewer hydrogen atoms than the alkane with the same number of carbon atoms.
  4. What are the conditions for the addition of water to alkenes?
    The conditions for the additional of water to alkenes is to use steam passed over a catalyst of hot phosphoric acid. The resulting product is an alcohol.
  5. What are the conditions for the addition of halogens to alkenes?
    If the alkene is a gas the halogen must also be a gas. If the alkene is a liquid then the halogen can be bubbled through as a gas.
  6. What are the names of the first four members of the homologous series of alkenes?
    The first four members of the homologous series of alkenes are ethene, propene, butene and pentene.
  7. What is the structural and display formula ethene?
    The structural formula for ethene is C2H4, display formula shows C=C with 2 hydrogens bonded to each C by a single bond.
  8. What is the structural and display formula pentene?
    The structural formula for ethene is C5H10, display formula shows one C=C anywhere with all other carbons single bonded C-C. There are 10 carbons single bonded, each carbon has four bonds in total.
  9. What is the functional group for alkenes?
    Alkenes are hydrocarbons with the functional group C=C.
  10. What determines the reactions of organic compounds?
    It is the generality of reactions of functional groups that determine the reactions of organic compounds.
  11. How does the combustion of alkenes differ in oxygen and in air?
    Alkenes react with oxygen in combustion reactions in the same way as other hydrocarbons, but they tend to burn in air with smoky flames because of incomplete combustion.
  12. How do alkenes react with hydrogen, water and the halogens?
    Alkenes react with hydrogen (in the presence of a nickel catalyst), water (phosphoric acid catalyst) and the halogens, by the addition of atoms across the carbon-carbon double bond so that the double bond becomes a single carbon-carbon bond.
  13. What are the conditions required for the addition of hydrogen to alkenes?
    The conditions for the addition of hydrogen to alkenes is 300oC and over a heated catalyst of finely divided nickel
  14. What are the conditions required for the addition of water to alkenes?
    The conditions for the addition of water to alkenes is high temperature (for steam) and a phosphoric acid catalyst.
  15. What are the structures of the following products of alkene addition reactions: 1. dibromoethane 2. dichloroethane 3. ethanol 4. ethane
    The structures of the following products of alkene addition reactions are: 1. dibromoethane = CH2BrCH2Br 2. dichloroethane = CH2ClCH2Cl 3. ethanol = C2H5OH 4. ethane = C2H6
Identify questions for high, middle, low and identify questioning techniques- Challenge questions

Learning Phases/Episodes
Think about how you can match the needs of ALL students
Differentiation: AGT, SEND, LLL, Disadvantaged
Remember to check for PROGRESS
Starter Activity Differentiation and Challenge question/task
  • Students to copy and complete the keywords.
  • Teacher reveals missing letters; Students correct mistakes;
  • Discuss the scientific meanings of the words.
  • Students to write down the definitions of the most important / new keywords.
  • Discuss the 'Memory Anchor'.
    • What does it show?
    • How does it relate to the what we are learning about today (title)?
Think about PACE – Develop, consolidate and deepen knowledge, skills and understanding
Teacher or Student lead? Differentiation and Challenge question/task
Progress Check Extension
Remember to give time to apply knowledge, skills and understanding
Teacher or Student lead? Differentiation and Challenge question/task
Progress Check Extension

Teacher or Student lead? Differentiation and Challenge question/task
Progress Check Extension

Teacher or Student lead? Differentiation and Challenge question/task
Progress Check Extension


Plenary Differentiation and Challenge question/task
  • Students to answer the 'Key Questions' with learning partners.
Progress Check
  • Teacher to reveal and discuss the answers to the questions.
 Extension
  • What have learnt about the 'Big Ideas' today?

Homework Differentiation and Challenge question/task