Page 91 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

2. Kindling fire by pouring oil.
Heap up some potassium permanganate on a tile. Keep a
piece of dry cotton wick on top of it. Pour one or two drops
of glycerine on the wick. Observe the changes.

3. Take a magnesium ribbon and clean it by scrubbing. Then
burn it in air. Collect the product formed and dissolve it in
water. Dip litmus papers and pH paper in this solution and
observe. Find out the reason for the results of the
observations.
4. Take sodium chloride solution in a beaker. Add to it a few
drops of phenolphthalein. With the help of two carbon rods,
let electricity pass through the solution. Record your
observations. What is your inference?

5. Take some silver nitrate solution in a test tube and add some
sodium chloride solution to it. What is the colour of the
precipitate formed? Filter the precipitate using a filter paper,
place it on a watch glass and keep it exposed to sunlight.
What do you observe?
Try to write down the equation of your observation with the
help of your teacher.
Identify the change of energy involved in the second chemical
reaction and write down what type of chemical reaction it is.

90 Basic Science VIII