SHS2 Chemistry · Semester 2 Week 18: Organic Functional Groups

Lesson notes

Learning Objectives

Indicator: 2.3.2.LI.5 - Explain the structure, nomenclature, preparation, properties and uses of alkanoic acids as well as their characteristic test.

By the end of the lesson, learners can:

Generate the first six members of the alkanoic acid homologous series (methanoic to hexanoic acid) and state their molecular and structural formulas.
Apply IUPAC rules to name alkanoic acids up to C6 and draw structures of their positional isomers.
Write balanced chemical equations for the preparation of alkanoic acids from primary alkanols, alkanals, and alkyl benzenes.
Account for the physical properties of alkanoic acids (solubility, boiling point, melting point, density, volatility) in terms of hydrogen bonding and molecular size.
Describe and carry out characteristic tests for alkanoic acids, including their reaction with alkanols to form esters (which have a fruity smell), and state the uses of alkanoic acids in everyday life.

Sign in with your phone number to read the full note and download the GES plan - free.

Sign in with phone number

Curriculum details

Strand: Chemistry of Carbon Compounds (Strand 3)
Sub-strand: Organic Functional Groups (3.2)
Content standard: 2.3.2.CS.1 - Demonstrate knowledge and understanding of source, structure, nomenclature, properties and uses of organic compounds as well as the characteristic test for their functional groups. 2.3.2.LO.1 Explain the source, structure, nomenclature, properties, uses of the various classes of organic compounds and the test for their functional groups.
Indicator: 2.3.2.LI.5 - Explain the structure, nomenclature, preparation, properties and uses of alkanoic acids as well as their characteristic test.
Suggested placement: Semester 2, Week 18 (Week 38 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 89

Exemplars (from the NaCCA curriculum)

Collaborative Learning Approach:
- Generate members of alkanoic acids (carboxylic acids) up to C6.
- Apply IUPAC rules to name alkanoic acids up to C6 and their isomers.
- Write chemical equations for the production of alkanoic acids (i.e., from primary alkanols, alkanals, alkyl benzene).
- Discuss the biological way of producing ethanoic acid from acid fermentation.
- Discuss the physical properties of alkanoic acids (solubility in water, boiling point, melting point, density, volatility).
- Account for the acidity of alkanoic acids and state the factors that affect their acidity.
Exploratory Learning: Plan and carry out simple test tube experiments or watch videos or use virtual laboratory to investigate the reactions of alkanoic acids with the following substances: Na, NaOH, NaHCO , Na CO , NH , ROH, LiAlH
Experiential Learning:
- Conduct an experiment to test for alkanoic acids through the reaction with alkanols to produce esters.
- Talk about other ways of testing for the presence of alkanoic acids.
Initiating Talk for Learning:
- Describe some synthetic pathways of alkanoic acids.
- Describe some uses of alkanoic acids (manufacture of synthetic flavouring, nylon, food preservatives, vinegar, terylene, brighteners).
Teaching and Learning Materials:
- * Molecular models * Video of greenhouse effect, toxicity of CO, acid rain * Worksheets with task on naming, isomer, and properties * Worksheets with tasks on naming, isomers, properties, uses of alkenes * Video of preparation of ethyne * Worksheets with tasks on naming, isomers, properties, uses of alkynes * Materials to design alcohol breath analyser Kit for esterification reactions * Na, NaHCO , PCl , C H OH, LiAlH * Worksheets on reactions of benzene
- WEBSITE * Virtual lab/video on laboratory and reactions of alkanoic acids * Virtual lab/video on laboratory and industrial preparation of alcohol
- 3 5 2 5
- YEAR THREE
- 4
- * Virtual labs on preparation of
- Virtual lab on preparation of
- Videos on the topic:
- CHARTS * Charts on homologous series column * Charts on uses of alkynes * Charts on uses of alkenes * Chart on uses of benzene
- Chart on classes of alcohols,
- Chart on uses of alkanoic acids * Chart on molecular orbital
- alkene, test for alkenes alkynes khanacademy.org
- of alkanes, fractionating
- uses of alkanols
- theory of benzene
Assessment (2.3.2.AS.5). The document marks these depth-of-knowledge levels for this indicator: Level 4 Extended critical thinking and reasoning.