mr leung ka yin (hkta the yuen yuen institute no.2 secondary school)
DESCRIPTION
Experience sharing of the implementation of “ Inquiry-based Chemistry Experiments ” in classrooms. Mr Leung Ka Yin (HKTA The Yuen Yuen Institute No.2 Secondary School). Experiments attempted:. Electrolysis of Aqueous Copper(II) Chloride Solution (in March 2002) - PowerPoint PPT PresentationTRANSCRIPT
Experience sharing of the implementation of “Inquiry-based Chemistry Experiments” in classrooms
Mr Leung Ka Yin (HKTA The Yuen Yuen Institute No.2 Secondary School)
Experiments attempted:
Electrolysis of Aqueous Copper(II) Chloride Solution (in March 2002)
Making of Sulphur dioxide (in July 2002)
Electrolysis of Aqueous Copper(II) Chloride Solution
Objectives: To investigate the electrical
conductivity of copper(II) chloride. To study the products in the
electrolysis of an aqueous copper(II) chloride solution.
Students have to … design and draw a simple circuit
diagram of electrolysis draw diagrams or write scripts for
the step-by-step sequence of the experiments
seek advice from teacher carry out their tests designed
Students have to …(Cont’d) record the observations of the
experiments. prepare a report after the
experiment
Teacher has to… try out the experiment before
making comments. introduce the nature of this kind of
experiment prepare a menu of suitable level
for his/her students Amend the design of the students
Lab. Tech. has to… co-operate with the teacher prepare the requested apparatus
and chemicals stand-by and assist the teacher
when the experiment is conducting
Students’ Resources References in the Library Internet resources School Textbooks Classmates within their group Hand-out (Tasks, Materials
avaliable, Questions for Further Thought)
My working schedule 1 period for introduction of this expt. 3 working days for students to design 3 working days for teachers to
“mark” their suggestions 1 day for lab technician to prepare
the chemicals and equipment 1.5 periods for the experiment by
students
My working schedule (Cont’d) Half period for class discussions 1 week for marking individual
reports
The set-up in textbooks
mA mA mA
Cathode
Anode
CuCl 2 solution
Container
Some Reflections Different generic skills can be trained,
especially analytical and communication
Students-centred activities No unique answer for science questions A step forward to make face the decline
of the quality of students (If not, what else could we do?)
4 months later…
Making Sulphur Dioxide To prepare sulphur dioxide gas.
To study the chemical properties of sulphur dioxide gas.
Three common methods to generate sulphur dioxide (SO2)
warming acidified sulphite solution, burning sulphur in air, adding copper to concentrated
sulphuric acid.
Safety Precautions! Avoid inhaling deeply the sulphur
dioxide gas produced in the experiment.
Perform the experiment in a well-ventilated laboratory / fume cupboard.
My working schedule Half a period for introduction of
this expt. for students to design 1 day for lab technician to prepare
the chemicals and equipment A special post-exam day (2 hours)
for for the experiment by students
My working schedule (Cont’d) one hour for class discussions
which include the presentation of different set-up by different groups, including the pros and corns.
After the Examinations…
Conclusions “No Royal road to learning” The attitudes of students have
changed a lot. A long term investment on the part
of students. Time to adapt: Both students and
teachers (including Lab. Tech.)
Conclusions (Cont’d)
If there is no guarantee of Exam result by drilling of questions, why not induce their motive to learn by themselves at the beginning of the term?