Carbon dioxide

1
Carbon dioxide Carbonates react with acids and
produce carbon dioxide. Calcium carbonate
(marble) reacts with sulphuric acid. The test for
carbon dioxide uses limewater. The gas turns
limewater from clear to cloudy. The reaction of
acids on carbonates is sometimes called
corrosion. Oxygen Many substances react with
oxygen when they burn. Hydrogen reacts with
oxygen to make water. This reaction is sometimes
called combustion. The test for oxygen uses a
glowing splint. Oxygen will relight the glowing
splint so that it burns. Hydrogen Some metals
react with acids and produce hydrogen. Magnesium
reacts with hydrochloric acid. The test for
hydrogen uses a burning splint. Hydrogen will
produce a squeaky pop. The reaction of metals
with acids is sometimes called corrosion.