Which one is a chemical change- burning of methane gas lr freezing of water
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Therefore, hydrogen burning in air involves physical and chemical changes. The physical change is the change from the gas state to the liquid state whereas the chemical changes is the change of the substance from hydrogen to water.
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Therefore, hydrogen burning in air involves physical and chemical changes. The physical change is the change from the gas state to the liquid state whereas the chemical changes is the change of the substance from hydrogen to water.
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