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
Reaction to limewater
• Turns Cloudy in the presence of CO2
Reaction to glowing splint
• Splint reignites in the presence of oxygen
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.
http://www.youtube.com/watch?v=1PLH4H7Mjl8
Hindenburg in 1937
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 propertiesGas Liqid Certain metal saltsHydrogenBurning splint test explosion
WaterCobalt chloride paper turns pink
Flame test Flame will take a characteristic colour depending on the metal
OxygenGlowing splint test re-ignition
Acid /BaseLitmus paper acid > red base > blue
Carbon dioxideLimewater test gets cloudy
Homework
• Workbook pages 17 and 18 (# 1 to 6)