THE CHARACTERISTI

CS OF LIVING THINGS

Part2

TESTING FOR CARBON DIOXIDE IN EXHALED BREATH You can test your exhaled air for carbon

dioxide by passing it through limewater. If carbon dioxide present it reacts with

calcium hydroxide dissolved in water to produce insoluble calcium carbonate. This makes water turn to white or milky

TESTING FOR CARBON DIOXIDE IN AIR AROUND SEEDS Carbon dioxide production can be used

as an indication of respiration and a sign of life.

Hydrogen carbonate indicator is a liquid that changes colour in the presence of carbon dioxide.

It changes from an orange-red colour to yellow.