Science - Teachers Sri Lanka
Science - Teachers Sri Lanka
Science - Teachers Sri Lanka
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
How to prepare the jelly medium<br />
Dissolve a small quantity of NaCl in 250 cm 3 of water, add 5g of Agar and while stirring well<br />
boil for about 10 mts. Once the mixture is viscous add 2 cm 3 of phenolphthalein, take away<br />
the beaker from the burner stir and when it is some what cool add 1 cm3 of Potacium<br />
ferricyanide and stir further. Before it gets solidified add to petri dishes with Iron nails and<br />
allowed to cool. (See that air bubbles do not get into the jelly). It ispossible to use poedered<br />
sago instead of jelly.<br />
Instrution for preparation of work stations.<br />
Annex 3.6.2<br />
Copyright © 2007 National Institute of Education - <strong>Sri</strong> <strong>Lanka</strong>. All rights reserved.<br />
• Keep the following materials and prepare 4 work stations.<br />
• work station - 1 - Three Iron nails (7 cm) , sand paper, 3 petri dishes, Mg and Sn<br />
metal strips 1 piece (size 0.5 cm x 5 cm)<br />
• work station - 2 - Three Iron nails (7 cm), sand paper, 3 petri dishes, Al and Pb<br />
metal strips 1 piece (size 0.5 cm x 5 cm)<br />
• work station - 3 - Three Iron nails (7 cm), sand paper, 3 petri dishes, Zn and Cu<br />
metal strips 1 piece (size 0.5 cm x 5 cm)<br />
• Keep at each work station materials required to prepare a jelly medium.
Change language