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==Key Stage 4==
===Meaning===
[[Carbon Dioxide]] is a [[gas]]eous (at [[Room Temperature|room temperature]]) chemical [[compound]] with [[Chemical Formula|formula]] CO<sub>2</sub>.
===Testing for 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]].