SHS1 Chemistry · Semester 1 Week 2: Matter and Its Properties

Lesson notes

Learning Objectives

Indicator: 1.1.1.LI.2 - Discuss and explain safety rules and hazard symbols in the laboratory.

By the end of the lesson, learners can:

State at least eight safety rules that must be followed in the Chemistry laboratory and explain the reason for each rule.
Identify and sketch at least six hazard symbols found on chemical containers, electrical gadgets and household items, and explain what each symbol means.
Categorise hazard symbols under the headings: corrosive, toxic, oxidising, flammable, explosive, radioactive, irritant/harmful and biohazard.
Distinguish between hazard signs, prohibition signs and first aid signs, giving examples of each.
Demonstrate correct use of personal protective equipment (chemical goggles, hand gloves, apron/laboratory coat) and identify safety equipment (eye wash station, safety shower, fume chamber) and explain when each is used.

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Curriculum details

Strand: Physical Chemistry (Strand 1)
Sub-strand: Matter and Its Properties (1.1)
Content standard: 1.1.1.CS.1 - Demonstrate understanding of the scientific practices in chemistry using relevant acquired skills to solve problems as well as explaining the structure of the atom and its stability. 1.1.1.LO.1 Use the knowledge and understanding of the scientific practices in Chemistry to explain the structure of the atom as well as the stability of its nucleus. 1.1.1.LO.2 Use the mole concept to determine the amount and quantity of various substances involved in chemical reactions. 1.1.1.LO.3 Write mole ratios for chemical equations and apply it in quantitative analysis. 1.1.1.LO.4 Use the kinetic theory of matter to explain the behaviour of solids, liquids and gases under different conditions and describe the laboratory preparation of gases as well as their uses in everyday life.
Indicator: 1.1.1.LI.2 - Discuss and explain safety rules and hazard symbols in the laboratory.
Suggested placement: Semester 1, Week 2 (Week 2 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. 27

Exemplars (from the NaCCA curriculum)

Talk for Learning:
- In pairs or groups, watch videos or use charts to show wrong practices in the Chemistry laboratory and discuss the 'dos' and 'don'ts' in the Chemistry laboratory, and hence the rules and regulations that should be followed in the Chemistry laboratory.
- Examine the assay of chemical containers or reagents, electrical gadgets and other materials and identify the hazard symbols on them. Discuss a. chemical hazards under the following headings: (corrosive, toxic, oxidising, flammable, explosive, radioactive, irritant/harmful, biohazard) b. Prohibition signs under the following headings: (No naked flame, danger, No smoking, High voltage, etc) c. First aid sign (First aid, safety shower, eye wash station).
- Sketch the hazard symbols and explain what they mean.
- Through think-pair-share, exchange ideas on how to handle those materials safely using personal protective equipment (chemical goggles, hand gloves, apron/laboratory coat, respirator/gas mask etc) and safety equipment (eye shower station, fume chamber etc).
Collaboration and Communication: Discussing laboratory rules and hazard symbols.
Teaching and Learning Materials:
- * ICT devices * Household items with labels * Chemical containers with labels * Containers having chemical assay * Personal protective equipment (goggles, laboratory coat/apron, hand gloves etc) * * Http://www.kentchemistry.com/links/atomicstructure/PauliHundsRule.htm Hydrogen peroxide * * Http://www.youtube.com.watch?v=2AFPfg0come
- Hydrazine * * Http://www.khanacademy.com Oxidising materials * * Https://www.youtube.com/watch?v=ZIAyNFLRFuw Flammable materials * * https://phet.colorado.edu/en/simulations/rutherford-scattering Acetic acid and nitric acid * * https://www.khanacademy.org/science/chemistry/electronic-structure-of-
- Worksheets with incomplete nuclear reactions with prepared mark schemes * * http//www.youtube.com/watch?v=PpOAlj7sOEc Worksheets of empty orbital diagram for learners to complete * Worksheets with blank column for numbers of proton, neutrons and electrons * Fire extinguisher * Fire blanket * * Charts of hazard, prohibition and mandatory Material for setting fire * * Videos or charts of wrong practices in
- Markers * * Chart of the mass spectrometer Cardboard
- * Potassium permanganate and glycerol * Counters with up and down orientation to represent electron spin-pairing and boxes to represent orbitals * Modelling clay (plasticine) * Clay * Styrofoam * Calculator
- Models: Use One balloon per s orbital, per p-orbital, three (different coloured) subshell of P orbital
- WEBSITES * Chemsketch or simulation for filling atomic
- atoms/history-of-atomic-structure/a/discovery-of-the-electron
- * https://www.khanacademy.org/science/chemistry/electronic-structure-of- atoms/history-of-atomic-structure/v/rutherfords-gold-foil-experiment * Http//www.youtube.com/watch?v=m92QR7CBNoQ
- CHARTS
- * Mass spectrogram for analyses * Charts of experimental set-up of J. J.
- Rutherford's alpha particle scattering * Charts of line and continuous spectra
- Chart showing how the energy levels in series
- two balloons joined at their knots pairs of balloons to make one
- orbitals
- symbols the chemical laboratory
- Thompson's experiment and experiment
- the hydrogen give rise to spectral
Assessment (1.1.1.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.