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This investigative study in chemistry, conducted in groups of 3 to 5 students, aims to provide hands-on opportunities for students to design and conduct investigations to solve problems. By engaging in scientific processes, students will enhance their knowledge, practical skills, creativity, critical thinking, communication, and problem-solving abilities. The study is aligned with the NSS Chemistry curriculum and involves tasks like extracting pigments, designing chemical cells, and extracting copper from ores. Through this 20-hour program, students will learn how to plan, execute, and report on their investigations. It is essential to guide students on group work, defining research topics, information search, planning, and reporting. Considerations for resource availability, safety, and collaboration with laboratory technicians are crucial for successful implementation. This practical approach encourages student autonomy in research questions while providing necessary guidelines to ensure timely completion. Discussions on suitable investigation topics, implementation timing, and the role of laboratory technicians are essential for a successful chemistry investigative study.
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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?