This gas makes a squeaky pop with a lit spill - hydrogen, This gas will turn limewater cloudy - carbon dioxide, This gas will relight a glowing spill - oxygen, When something reacts with oxygen it makes this kind of chemical - oxide, When metals react with an acid they make this gas - hydrogen, When carbonates react with acids they make this gas - carbon dioxide, We see this when a gas is produced in a reaction - fizzing, This is always made in a chemical reaction - a new substance,

Reactions and gases

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