Matter and Its Properties

Through a Class Discussion:
- Explain relative atomic mass and relative molecular mass.
- Describe the principal parts of a mass spectrometer and explain how it works, using charts or pictures or models.
Problem Solving Approach:
- Identify peaks on a simple mass spectrum and use them to calculate the relative abundance and masses of isotopes.
- Calculate the relative atomic mass of different elements from: (a). Mass spectrum (b). Percentage abundance data
Collaborative Learning:
- Discuss radioactivity and distinguish between nuclear reactions and chemical reactions.
- Use simulations or charts to investigate and describe the properties of alpha, beta and gamma radiations
- Complete and balance simple nuclear reaction equations.
- Explain why certain nuclei are unstable in terms of neutron-to-proton ratio and binding energy per nucleon.
Problem Solving Approach:
- Define and determine the half-life of a nuclide from experimental data and by calculation.
- Use half-life information to determine the amount of radioisotopes remaining at a given time.
Using Think-Pair-Share Approach: Discuss the uses of radioisotopes and explain the principle behind each use as well as the risks associated with radioactivity.
- Graph sheet
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.9). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.