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A mixture of hydrogen gas and oxygen gas are ignited and the following reaction occurs: Hydrogen + Oxygen = Water + Energy. Is this an Endothermic or Exothermic reaction and why?

  • physical science -

    If it burns, doesn't it give off heat?

  • physical science -

    I'm not sure it burns. that's my problem. I would assume it burns because it is being ignited. But the question that will be on the test tomorrow is "2 students ignight a mizture of hydrogen gas and oxygen gas in a test tube. The following reaction occurs: Hydrogen + Oxygen = Water + Energy. Is the reaction that occurs endo or exothermic and why?"

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