learning and teachering resources on practical for
TRANSCRIPT
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LEARNING AND TEACHING
RESOURCES ON PRACTICAL FOR
CHEMISTRY AND COMBINED
SCIENCE (CHEMISTRY PART)
Sophia SL Cheng
Science Education Section, EDB
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Resource materials Examples of experiments for SBA tasks
1. Inquiry-based Chemistry Experiments
(CUHK & EDB, 2002)
2. Learning and Teaching Activities for
the Revised Sixth Form Chemistry
Curriculum (EDB, 2005)
3. Investigative Study in Chemistry –
Exemplars of Learning and Teaching
Activities (HKUST, EDB & HKEAA,
2009)
1.
• Identification of white solids
2.
• Determination of the heat of combustion of alcohols
• Relative molecular mass of butane
• Concentration effect and reaction rate
3.
• Getting copper from its ore
• Making your own acid-base indicator
• How to make it hot?
4. Workshops on Miniature Practical
Chemistry (HKUST & EDB, 2008)
4.
• Synthesis of isoamyl acetate (banana oil)
• Isolation of chlorophyll from spinach
5. Resource Book for Sixth-Form
Practical Chemistry (CUHK, EDB &
HKEAA, 2004)
5.
• Calcium carbonate in eggshell (Inquiry-based)
• Alcohol breath analysis
6. Experiments of Microscale Analytical
Chemistry and Microscale Organic
Chemistry for Secondary Schools
(HKUST & EDB, 2011)
6.
• Microscale separation of components in a mixture
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PRACTICAL ACTIVITIES FOR CHEMISTRY AND
COMBINED SCIENCE (CHEMISTRY PART)
Acids and Bases
pH Curve (with the use of datalogger)
Mole Concept and Stoichiometry
Decomposition of Baking Soda
Determining the Stoichiometry of Reaction Between
ClO- and S2O32- / OH-
SBA
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Rate of Reaction
To study how concentration/temperature affects the
rate of reaction
Reaction of Phenolphthalein in NaOH solution (with
the use of datalogger)
Catalysts for the Decomposition of H2O2 (with the
use of datalogger)
Elephant Toothpaste – Effect of Catalyst on
Reaction Rate
Microscopic World II
Evaporation and Intermolecular Attractions
Preparation of “Slime”
Analytical Chemistry
Thin-layer chromatography of painkillers
SBA
SBA
SBA
SBA
SBA
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ASSESSMENT OBJECTIVES
(SECTION 5.3 OF C&A GUIDE)
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2014 HKDSE Paper I Q7
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INTEGRATE SBA IN LEARNING
AND TEACHING
Example 1
Pre-lab assignment +
Volumetric analysis using HCl(aq) and Na2CO3(aq)
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PRE-LAB ASSIGNMENT
To ensure students to watch the video and
understand the experimental procedures
To enable teachers to check students’
understanding and misconception, and provide
timely support
2. Answer questions such as:
- Briefly describe how to prepare
standard sodium carbonate
solution from solid sodium
carbonate
- Calculate the amount of solid
sodium carbonate needed for
preparing 250 cm3 0.20 mol dm-3
sodium carbonate solution
In preparing students for VA assessment
1. Watch the related video
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INTEGRATE SBA IN LEARNING
AND TEACHING
Example 2
To study how concentration affects the rate of a
reaction using datalogger +
Post-lab assignment
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TO STUDY HOW CONCENTRATION AFFECTS
THE RATE OF A REACTION USING
DATALOGGER
pH of solution is 8.2 – 12:
H2Ph(aq) + 2OH(aq) → Ph2-(aq) + 2H2O(l) (fast)
phenolphthalein
colourless pink
pH of solution is above 12:
Ph2-(aq) + OH-(aq) PhOH3-(aq) (slow)
pink colourless
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SAMPLE ABSORBANCE – TIME CURVES
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2015 HKDSE Paper I Q9
POST-LAB ASSIGNMENT
To consolidate students’ understanding on the
concepts involved in the experiment
To enable teachers to check students’ understanding
and misconception, and provide timely support
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2015 HKDSE Paper I Q9
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INVESTIGATIVE STUDY
Assessment requirement for Chemistry:
Investigative Study can be done in lieu of Other
Experiments. One assessment on ‘proposal’ and one
assessment on ‘process and report’ should be
performed. These two assessments can satisfy the
minimum requirement for Other Experiments.
Investigative Study in
Chemistry – Exemplars of
Learning and Teaching Activities
(HKUST, EDB & HKEAA, 2009) School-based Assessment Sample Tasks
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Objectives: To investigate the effect of the use of
catalyst on reaction rate and compare the effectiveness
of different catalysts on the decomposition of H2O2
Possible catalysts:
KI(aq) / MnO2(aq) / Celery / Pig Liver ….
INVESTIGATION - CATALYSTS FOR THE DECOMPOSITION OF HYDROGEN PEROXIDE
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THE EXPERIMENT
to data logger OR
to gas syringe Plant extract (potato)
One of the following catalysts:
Powdered manganese(IV) oxide
(MnO2)
Fresh potato extract
Fresh celery extract
A small piece of fresh pig liver
1 M Fe(NO3)3(aq) / FeCl3(aq)
1 M KI(aq) Adding catalyst into 100 cm3
H2O2(aq)
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EXPERIMENT RESULT
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http://edblog.hkedcity.net/nsschem
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http://minisite.proj.hkedcity.net/edbosp-sci/eng/home.html
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References and resources for Chemistry, Science Education Section, EDB
(http://www.edb.gov.hk/en/curriculum-development/kla/science-edu/ref-and-resources/index.html)
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CHEMISTRY EXPERIMENTAL TECHNIQUES
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http://minisite.proj.hkedcity.net/safetyonline/eng/index.html
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LEARNING, TEACHING AND ASSESSMENT OF SBA OF
CHEMISTRY AND COMBINED SCIENCE (CHEMISTRY PART)
PRACTICAL RELATED TASKS FOR NEW TEACHERS
(RE-RUN)
(CDI020160286)
Date: 30/10/2015 (Friday)
Time: 2:00pm – 5:00pm
Venue: EDB Kowloon Tong Education Services Centre
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CONTACT INFORMATION
Dr Raymond Fong
Tel: 3698 3436
Email: [email protected]
Tim Tse
Tel: 3698 3438
Email: [email protected]
Sophia Cheng
Tel: 3698 3439
Email: [email protected]