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Investigative Study in Chemistry. Sophia Cheng 13 October 2009. Topic XVI Investigative Study in Chemistry. Conducted in groups of 3 to 5 students Provide students with opportunities to design and conduct an investigation with a view to solving a problem
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Investigative Study in Chemistry Sophia Cheng 13 October 2009
Topic XVI Investigative Study in Chemistry • Conducted in groups of 3 to 5 students • Provide students with opportunities to design and conduct an investigation with a view to solving a problem • Students will learn about scientific processes and how these processes work to generate new information
Aims of investigative study • Students can: • apply their knowledge and understanding of chemistry • develop and apply various practical skills • develop skills such as creativity, critical thinking, communication, problem-solving • develop understanding on nature of science
For learning and teaching Topic XVI in NSS Chemistry curriculum • For assessment in SBA
Before/While conducting IS, students should be guided on: • How to work together in a group to develop an investigation plan and solve a problem • How to define a researchable topic • How to search for relevant information from various sources • How to write an investigation plan • How to write a laboratory report or make a poster for presentation
Investigative study (20 hours) • Design and conduct a first-hand investigation 1. Design 2. Process 3. Report
Try-out: Making Your Own Acid-Base Indicator Tasks: • Extract coloured pigments from plant materials • Use the extract as acid-base indicator and find the concentration of alkali in oven cleaner
More examples Salt content of snack • Gravimetric method • Titrimetric methods: • Volhard method: back titration of Ag+ with KSCN using Fe2+ as indicator • Mohr method: titration with Ag+ using K2CrO4 as indicator
Design and make: Chemical cell “Coin Cell” made by aluminium foil and coins. This chemical cell consists of 9 pairs of metal couples. Its voltage is between 2 – 2.5V.
CuCO3.Cu(OH)2.H2O(s) H2SO4(aq) heat CuSO4(aq) CuO(s) C(s), H2(g) or Town gas Zn(s) or electrolysis Cu(s) Getting copper from its ore • To extract copper metal from a given ore sample • To isolate product • To calculate extraction efficiency • To calculate cost of the method
Appropriateness of the Topic • Does the activity address something worth learning? • Is the cognitive demand appropriate? • Do students have the required prior knowledge and adequate skills? • Is the time available sufficient for the activity?
Are resources such as journal articles, reference books, chemicals and apparatus available? • Are there any safety concerns? • Can laboratory technicians and others help in its implementation?
Your concern… • 10 groups, 10 different projects • Scale of investigation • Laboratory safety • Clash with investigation of other science subjects such as Physics • Collaboration with lab tech and other teachers
Discussion • When is the best time to implement IS? Why? • What chemistry investigations do you think are suitable for IS? • How much autonomy should students have in deciding their research questions?
What guidelines regarding IS will you give to students? How will you guide students to finish IS on schedule? • How will you prepare yourself to implement IS? • What is the role of the laboratory technician in IS?