LEARNING AND TEACHING RESOURCES ON PRACTICAL FOR CHEMISTRY AND COMBINED SCIENCE (CHEMISTRY PART) Sophia SL Cheng Science Education Section, EDB
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1 LEARNING AND TEACHING RESOURCES ON PRACTICAL FOR CHEMISTRY AND COMBINED SCIENCE (CHEMISTRY PART) Sophia SL Cheng Science Education Section, EDB
2 Resource materials 1. Inquiry-based Chemistry Experiments (CUHK & EDB, 2002) 2. Learning and Teaching Activities for the Revised Sixth Form Chemistry Curriculum (EDB, 2005) Examples of experiments for SBA tasks 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. Investigative Study in Chemistry Exemplars of Learning and Teaching Activities (HKUST, EDB & HKEAA, 2009) 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) 5. Resource Book for Sixth-Form Practical Chemistry (CUHK, EDB & HKEAA, 2004) 6. Workshops on Implementing Microscale Chemistry Experiments (HKBU & EDB, ) 4. Synthesis of isoamyl acetate (banana oil) Isolation of chlorophyll from spinach 5. Calcium carbonate in eggshell (Inquiry-based) Alcohol breath analysis 6. Reactivity series of magnesium, zinc and copper Chemical cells / fuel cell 7. Experiments of Microscale Analytical Chemistry and Microscale Organic Chemistry for Secondary Schools (HKUST & EDB, 2011) 7. Microscale separation of components in a mixture
3 ASSESSMENT OBJECTIVES (SECTION 5.3 OF C&A GUIDE)
4 2013 HKDSE Paper I 4(d), (e)
5 2013 HKDSE Chemistry Examination Report 4(d) (ii) In general, candidates were weak in handling chemical calculations. Some were not able to demonstrate an understanding that H 2 C 2 O 4 (aq) reacts with NaOH(aq) in 1:2 mole ratio. (e) (i) Some candidates wrongly mentioned that the residual acid affects the concentration of the acid in the conical flask instead of its volume.
6 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 S 2 O 2-3 / OH - SBA
7 Rate of Reaction Reaction of Phenolphthalein in NaOH solution (with SBA the use of datalogger) Catalysts for the Decomposition of H2O 2 (with the use of datalogger) SBA Elephant Toothpaste Effect of Catalyst on Reaction Rate Microscopic World II Evaporation and Intermolecular Attractions Preparation of Slime SBA
8 TO STUDY HOW CONCENTRATION AFFECTS THE RATE OF A REACTION USING DATALOGGER ph of solution is : H 2 Ph(aq) + 2OH (aq) Ph 2- (aq) + 2H 2 O(l) (fast) phenolphthalein colourless pink ph of solution is above 12: Ph 2- (aq) + OH - (aq) PhOH 3- (aq) (slow) pink
9 SAMPLE ABSORBANCE TIME CURVES
10 EVAPORATION AND INTERMOLECULAR ATTRACTIONS To study temperature changes caused by evaporation of the following liquids: ethanol, propan-1-ol, butan-1-ol, pentane, hexane To relate temperature changes to the strength of the intermolecular forces of the liquid
11 THE EXPERIMENTAL SET-UP
12 SAMPLE RESULT Substance Temperature decrease ( o C) Ethanol 9.1 Propan-1-ol 6.4 Butan-1-ol 3.3 Pentane 16.2 Hexane 13.9 Factors affecting intermolecular forces: Molecular masses Hydrogen bond Compare the intermolecular forces among: Alkanes Alcohols Pentane and butan-1-ol
13 INVESTIGATION - CATALYSTS FOR THE DECOMPOSITION OF HYDROGEN PEROXIDE Objectives: To investigate the effect of the use of catalyst on reaction rate and compare the effectiveness of different catalysts on the decomposition of H 2 O 2 Possible catalysts: KI(aq) / MnO 2 (aq) / Celery / Pig Liver.
14 THE EXPERIMENT to data logger OR to gas syringe Plant extract (potato) One of the following catalysts: Powdered manganese(iv) oxide (MnO 2 ) Fresh potato extract Fresh celery extract A small piece of fresh pig liver 1 M Fe(NO 3 ) 3 (aq) / FeCl 3 (aq) Adding catalyst into 100 cm 3 1 M KI(aq) H 2 O 2 (aq)
15 EXPERIMENT RESULT
16
17
18 References and resources for Chemistry, Science Education Section, EDB (
19 CHEMISTRY EXPERIMENTAL TECHNIQUES
20
21 NSS UNDERSTANDING AND INTERPRETING THE CHEMISTRY AND COMBINED SCIENCE (CHEMISTRY PART) CURRICULA (REFRESHED) (CDI ) Date: 10/11/2014 (Monday) Time: 2:00pm 5:00pm Venue: EDB Kowloon Tong Education Services Centre
22 CONTACT INFORMATION Dr Raymond Fong Tel: Tim Tse Tel: Sophia Cheng Tel:
LEARNING AND TEACHING RESOURCES ON PRACTICAL FOR CHEMISTRY AND COMBINED SCIENCE (CHEMISTRY PART) Sophia SL Cheng Science Education Section, EDB
LEARNING AND TEACHING RESOURCES ON PRACTICAL FOR CHEMISTRY AND COMBINED SCIENCE (CHEMISTRY PART) Sophia SL Cheng Science Education Section, EDB Resource materials 1. Inquiry-based Chemistry Experiments
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