True: The combustion of hydrogen is an exothermic reaction., Any reaction where a substance combines with oxygen is also known as an oxidation reaction., Although rusting is a much slower and less vigorous reaction than combustion, it is also an oxidation reaction., When a substance combines with oxygen, we say that oxidation has taken place., When metals react with water or acids, heat energy is given out., False: Other substances burning in air are also oxidation reaction., The magnesium and oxygen combine to form magnesium dioxide., The iron and oxygen combine to form iron dioxide.,

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