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==Key Stage 3==
===Meaning===
The '''gas tests''' are a series of [[experiment]]s used to identify which [[gas]] has been produced in a [[Chemical Reaction|chemical reaction]].
===The Gas Tests===
====Carbon Dioxide====
#Use a [[Delivery Tube|delivery tube]] to bubble the gas through [[Limewater]].
#If the [[Limewater]] turns from [[transparent]] to cloudy then the [[gas]] is [[Carbon Dioxide]].
====Hydrogen====
#Collect the [[gas]] in a [[Test Tube|test tube]].
#Place a lit [[Wooden Splint|splint]] over the mouth of the [[Test Tube|test tube]].
#If a 'squeaky pop' [[sound]] is made then the [[gas]] is [[Hydrogen]].
====Oxygen====
#Collect the [[gas]] in a [[Test Tube|test tube]].
#Place a glowing [[Wooden Splint|splint]] over the mouth of the [[Test Tube|test tube]].
#If the [[Wooden Splint|splint]] relights then the [[gas]] is [[Oxygen]].
====Chlorine====
#Collect the [[gas]] in a [[Test Tube|test tube]].
#Place a piece of [[Litmus Paper|litmus paper]] over the mouth of the [[Test Tube|test tube]].
#If the [[Litmus Paper|litmus paper]] is [[bleach]]ed white then the [[gas]] is [[Chlorine]].
==Key Stage 4==
===Meaning===