Identification of White Powders

1
Identification of White Powders
2
Properties of a Physical Change

• Change in state of matter.
• Change in shape

3
Properties of a Chemical Reaction

• Production of gas
• Change in temperature (endothermic vs exothermic)
• Emitting light
• Formation of a precipitate (a solid formed from a
  solution)
• Color change

4
How to determine the identity of an unknown
substance.

• Solubility in water
• Soluble (dissolves in water) or insoluble (does
  not dissolve in water)
• Phenolphthalein
• (pink or no color change)
• Silver nitrate (color of precipitate)
• Acetic acid (bubbles or no bubbles)
• Potassium iodide
• (Blue/black color or no color change)