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 salts

HydrogenBurning 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)