SHS1 Chemistry · Semester 2 Week 19: Organic Functional groups

Lesson notes

Learning Objectives

By the end of the lesson, learners can:

Explain, in their own words, what a homologous series is and state the general characteristics of members of a homologous series.
Write down the homologous series for alkanes and alkenes using molecular, condensed, and structural formulae.
Compare and contrast successive members of a homologous series, identifying the constant increment (CH2) and the trend in physical properties.
Predict the molecular formula, condensed formula, and structural formula of a given member of a homologous series when given the formulae of neighbouring members.
Justify why members of the same homologous series show similar chemical properties but gradually changing physical properties.

Indicator: 1.3.2.LI.2 - Explain homologous series and state their properties.

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Curriculum details

Strand: Chemistry of Carbon Compounds (Strand 3)
Sub-strand: Organic Functional groups (3.2)
Content standard: 1.3.2.CS.1 - Demonstrate knowledge and understanding organic chemistry to classify organic compounds. 1.3.2.LO.1 Predict and classify organic compounds.
Indicator: 1.3.2.LI.2 - Explain homologous series and state their properties.
Suggested placement: Semester 2, Week 19 (Week 39 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. 58

Exemplars (from the NaCCA curriculum)

Talk for Learning: Deduce the meaning of homologous series using the inductive approach.
Inquiry-Based Learning:
- Write down the homologous series for alkanes and alkenes.
- Discuss the properties of homologous series based on the example.
- Demonstrate ways of representing organic compounds (molecular formula, condensed formula and structural formula) with the aid of charts, models etc.
Teaching and Learning Materials:
- * Work sheet for learners to tabulate the differences of organic compounds. * Molecular models to represent organic functional groups
- YEAR TWO
Assessment (1.3.2.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.