Chemical characteristic properties

Reaction to litmus paper Can identify if a substance is acidic or basic. Acid Base

Reaction to cobalt chloride paper Turns pink in the presence of water. no water with water Water goes into the crystal and changes the color of the crystal from blue to pink

Reaction to limewater Turns Cloudy in the presence of CO2 CaOH2 – solution – CaCO3 precipitates

Reaction to glowing splint Splint reignites in the presence of oxygen Reignite fire in fireplace through blowing, hair dryer, bellows A pair of bellows uses the same principal to reignite a fire

Reaction to burning splint An explosion will occur in the presence of hydrogen. Magnesium and acid in test tube plus match One more chemical characteristic property to look at: Hindenburg in 1937 http://www.youtube.com/watch?v=1PLH4H7Mjl8

One more chemical characteristic property that we need to talk about  what’s this? Have you ever wondered why some of them are orange, some green and some pink?

Reaction to an open flame The color of the flame may indicate the presence of certain substances. K Na Ba http://www.youtube.com/watch?v=PVj8aQwuUMo

Chemical characteristic properties Gas Liqid Certain metal salts Hydrogen Burning splint test  explosion Water Cobalt chloride paper  turns pink Flame test  Flame will take a characteristic colour depending on the metal Oxygen Glowing splint test  re-ignition Acid /Base Litmus paper  acid > red base > blue Carbon dioxide Limewater test  gets cloudy

Homework Workbook pages 17 and 18 (# 1 to 6) Ask students to write in their agenda