Characteriszation of Organic… · SHS1 Chemistry

Lesson notes

Learning Objectives

Indicator: 1.3.1.LI.1 - Describe qualitative and elemental analysis of organic compounds.

By the end of the lesson, learners can:

Distinguish between qualitative and quantitative elemental analysis of organic compounds, giving at least one example of each.
Describe the key steps involved in the purification of an impure organic compound using recrystallization, drying and distillation.
Explain how melting point and boiling point determinations are used to assess the purity of an organic compound.
Perform a simple paper chromatography analysis and calculate Rf values from a chromatogram.
Interpret a paper chromatogram to identify the components present in a mixture, such as a plant pigment extract.

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Curriculum details

Strand: Chemistry of Carbon Compounds (Strand 3)
Sub-strand: Characteriszation of Organic Compounds (3.1)
Content standard: 1.3.1.CS.1 - Demonstrate knowledge and understanding of the general processes involved in qualitative and quantitative elemental analysis of organic compound. 1.3.1.LO.1 Apply the knowledge and understanding in science to describe qualitative and quantitative elemental analysis of organic compound.
Indicator: 1.3.1.LI.1 - Describe qualitative and quantitative elemental analysis of organic compounds.
Suggested placement: Semester 2, Week 16 (Week 36 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. 55

Exemplars (from the NaCCA curriculum)

Digital Learning:
- Watch video clips or observe teacher demonstration of: a. Distillation b. Fractional distillation c. Crystallization
- Discuss the key steps in the use of recrystallization, drying and distillation to purify a given impure organic compound.
Inquiry-Based Learning: Explore the use of melting and boiling points to determine the purity of a given organic compound.
Experiential Learning:
- Demonstrate the determination of melting points of some organic solids (benzoic acid, oxalic acid, ethanamide).
- Describe paper chromatography as an analytical technique that separates components in a mixture of organic compounds and state its uses in everyday life, such as in forensics, natural product, environmental analysis etc.
- Analyse and interpret simple paper chromatograms including the use of R -values. f
Teaching and Learning Materials:
- * Virtual laboratory can be used, laptop, smart phone, video * Materials: fractionating column, Liebig condenser, round bottom flask, adapter, conical flask; water mixture, powdered charcoal, stirrer/hotplate and liquid paraffin Chromatography: beaker, capillary tube, cardboard, glass or other green plant, ethanol for pigment extract, petroleum to use as eluant * Test tubes, Bunsen burner, metal tong, pestle, mortar, gauze, filter paper, funnel, protective * Organic compounds containing N, S, and halogens, sodium metal, dil NaOH, dil H SO , HNO sodium pentacyanonitrosyl ferrate (II).
- thermometer, ethanol- chromatography paper, ether: propanone mixture
- cloth and eye google , dil AgNO , FeSO , FeCl , 2 4 3
- 3
- 4 3
Assessment (1.3.1.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.