Bonding · SHS1 Chemistry

Lesson notes

Learning Objectives

Indicator: 1.2.2.LI.2 - Explain how intermolecular forces affect physical properties of compounds.

By the end of the lesson, learners can:

Explain how the strength of intermolecular forces (London dispersion forces, dipole-dipole interactions, and hydrogen bonding) determines the melting point, boiling point, and volatility of compounds.
Predict and compare the boiling points of different compounds based on the type and strength of their intermolecular forces.
Relate solubility of a substance to the principle “like dissolves like” using intermolecular forces between solute and solvent molecules.
Explain how intermolecular forces influence density, viscosity, surface tension, and enthalpy of vaporisation of liquids.
Apply knowledge of intermolecular forces to predict the physical state of a substance at room temperature and justify everyday observations in Ghanaian life.

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Curriculum details

Strand: Systematic Chemistry of the Elements (Strand 2)
Sub-strand: Bonding (2.2)
Content standard: 1.2.2.CS.2 - Demonstrate knowledge and understanding that, the type of chemical bond in a compound determines the physical and chemical properties of that compound. 1.2.2.LO.1 Predict and explain ionic, covalent and metallic bonding as well as their characteristic properties. 1.2.2.LO.2 Predict and describe the type of intermolecular bonds that will be formed between a group of compounds
Indicator: 1.2.2.LI.2 - Explain how intermolecular forces affect physical properties of compounds.
Suggested placement: Semester 2, Week 15 (Week 35 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. 52

Exemplars (from the NaCCA curriculum)

Talk for Learning: Discuss and explain how intermolecular forces affect physical properties such as solubility, density, viscosity, enthalpy of vaporisation, volatility, surface tension, melting point and boiling points of compounds.
Experiential Learning: Perform activities to demonstrate some physical properties of covalent and ionic compounds such as their solubility in different solvents, density, melting point etc.
Inquiry-Based Learning:
- Predict the physical properties of various compounds based on the types of intermolecular forces that exist in them.
- Relate the physical properties of polar and non-polar compounds to their everyday life application.
Teaching and Learning Materials:
- CHARTS * Chart illustrating the types of intermolecular bonds * Chart containing the trend of covalent compounds according to their physical properties * Charts of boiling points of hydrides of Group 15, 16 and 17 elements * Charts of boiling points of halogens Molecular models,
- * Table of NH , H O and HF
- WEBSITES * Https://www.youtube.com/watch?v=RSRiywp9v9w https://www.youtube.com/watch?v=aH2IbYs_XjY
- 3 2
- and their boiling points
Assessment (1.2.2.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.