Science : White Powder Test

What is White Powder

Aim: To determine how different powders feel, look and react to other substances.

Equipment:

Baking Soda
Cornflour
Sugar
Salt
Iodine
Vinegar
Magnifying glass
Eyedrop
Black card
Tea spoon / stick

Method: 

1. Place one-fourth teaspoon (1 ml) of the four white powders on a sheet of black construction paper. Label the powders with your pen.
2. Study the powders with the magnifying glass. Examine what each powder looks like. How would you describe the powder's shape. Does it have large or small grains? Your observations should be written in the appearance column of the chart.
3. Examine the powders further by rubbing each powder between your fingers. Describe how each powder feels in the Texture column of the chart.
4. Determine if there is a smell to any of the powders. Record your findings in the Smell column of the chart.
5. Take the eyedropper and place a drop of water on each individual powder. Examine what happens? Do the powders dissolve? Is there a reaction? Write your observations in the Reaction to Water column.
6. Place one-half teaspoon (2ml) of each powder in a separate jar. Add 2 drops of iodine to each jar using the eyedropper. Record what happens in the Reaction to Iodine column. Iodine should be handled with care.

Substance	Appearance	Texture	Smell	Water	Vinegar	lodine
Cornflour	Large	Soft	it Smells like almost nothing	Oobleck	??	it Hardens
Sugar	Small	Rough	Nothing	I don't  know it looks gray	??	It turns Yellow
Salt	Small	Rough	it smells like an Odd perfume	the same as Sugar	??	it turns Orange
Baking Soda	Large	Rough[ a little]	it smells nothing	The same as Sugar and Salt	??	it is So sticky or so