CHEMISTRY PRACTICAL TASKS19TH JUNE, 2014

KENNETH HUI

SING YIN SECONDARY SCHOOL

2014/06/18

=Practical Tasks

for Chemistry

?

IMPORTANCE OF PRACTICAL TASKS FOR CHEMISTRY

• ASSESSMENT

• SKILLS TRAINING

• TEACHING AND LEARNING

STRATEGY

•多•快•好•省

1.Select Tasks with Teaching Purposes

STRATEGY

•多

•快

•好

•省

1. Select Tasks with Teaching Purposes

2.Data Logger

TITRATION CURVE OF A TYPICAL ACID-BASE NEUTRALIZATION REACTION

STRATEGY

•多

•快

•好

•省

1. Select Tasks with Teaching Purposes

2. Data Logger

3.Microscale Experiments

WHAT IS MICROSCALE CHEMISTRY EXPERIMENTSMicroscale (or small scale) chemistry carried out on a reduced scale using small quantities of chemicals and often (but not always) simple equipment.

John Skinner

Conducting chemical investigations with reagents amounted to 1/10 to 1/1000 of that of conventional laboratory using microscaleapparatus

WHY MICROSCALE CHEMISTRY EXPERIMENTS

ADVANTAGES RELATING TO LABORATORY MANAGEMENT:

• REDUCES THE RUNNING COST

• MINIMISE WASTES GENERATED

• REDUCE SAFETY HAZARDS

• LESS TIME-CONSUMING

• REDUCE THE STORAGE SPACES

• MORE COMFORTABLE LAB ENVIRONMENT

• MORE STUDENT PARTICIPATION

MICROSCALE APPARATUS

• WELL-PLATES/STRIPS

• PETRI DISH

• SYRINGE AND 1-2CM3 GRADUATED PIPETTE

• PLASTICS DROPPER

• MICROBURNER

• MICROSCALE QUICKFIT APPARATUS

MORE MICROSCALE APPARATUS

• GLASS DROPPER

• ZIP LOCK BAG

• BLU TACK

• CHEWING GUM PACKET…

• AND MORE…

SUPPLIER

• WWW.HKASME.ORG

• WWW.MCL.HK

CE 05 PI Q2

MICROSCALE REDUCTION OF COPPER(II) OXIDE

• THE GLOW OF THE REACTION AND THE CONDENSATION ARE EASILY SEEN

• THE STUDENTS ARE ABLE TO OBSERVE THE FORMATION OF COPPER

• THE SAFER EXPERIMENT MEANS YOU CAN FREE UP MORE OF YOUR MIND TO COMMUNICATE WITH THE CLASS

MICROSCALE COLUMN CHROMATOGRAPHY

• LESS SOLVENT REQUIRED

• SAFER

• MORE STUDENTS CAN INVOLVED

• PACK THE COLUMN FASTER

MICROSCALE COLUMN CHROMATOGRAPHY TO SEPARATE MIXTURES OF POTASSIUM PERMANGANATE

AND POTASSIUM DICHROMATE

• HTTP://WWW.HKEDCITY.NET/ICLUB_FILES/A/1/79/WEBPAGE/MC/COLUMN.HTML

MICROSCALE COLUMN CHROMATOGRAPHIC ISOLATION OF A RED PIGMENT FROM PAPRIKA

• STATIONARY PHASE: SILICA GEL

• ELUENT: CH2CL2:PE (V/V 1:3)

EXPERIMENTS

• ELECTROLYSIS OF WATER

• CHEMICAL CELLS

• RATE OF REACTION (SODIUM THIOSULPHATE SOLUTION AND DILUTE SULPHURIC ACID)

EXAMPLE : SYNTHESIS OF THE FRAGRANCE OF BANANA

OH

OH

O O

OH

OH+ +

H+

IsoamylAlcohol

Glacial AceticAcid Isoamyl Acetate

EXAMPLE : INVESTIGATING THE FOUR DIFFERENT OXIDATION STATES OF MANGANESE

HKUST 有機化學微型實驗工作坊（2008年8月）

• HTTP://CD1.EDB.HKEDCITY.NET/CD/SCIENCE/CHEMISTRY/TRAINING_COURSE_C.HTML

HKBU PROFESSIONAL DEVELOPMENT PROGRAMME ON IMPLEMENTING MICROSCALE CHEMISTRY EXPERIMENTS (MAY & JUN 2010)

• HTTP://MICSCHEM.HKBU.EDU.HK/

END

Adapt what you REALLY need to use!Sometimes, LESS is MORE!!

STRATEGY • 多

• 快

• 好

• 省

• Variety

• Short Tasks

• Learning process

• Smaller working space and less chemicals