20.1 - The percentage of oxygen in the air (number with one decimal), 0.03 - The percentage of CO2 in the air (number with two decimals), Thermal decomposition - Name of a method using heat to break carbonates into carbon dioxide and a metal oxide (2 words), Catalyst - A substance that speeds up a reaction without being used (1 word), Hydrogen peroxide - Name this: H2O2 (2 words), dense - Because carbon dioxide is ______ it will displace oxygen and put out fires (1), Combustion - Oxygen fuels _______ reactions (1), Alkali - Are dissolved metal oxides acidic or alkali?, Reduction - Reactions that remove oxygen are called _______ reactions (1),

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