What is meant by 'lower in energy'?

Question

And which is lower in energy, a mix of hydrogen and oxygen gases or liquid water?
Thanks!!

Answer 1

as an engineer, to me energy is 'the ability to do work'.
a mix of hydrogen / oxygen has the capacity to combust and give of heat. so that equates to a lot of chemical potential energy.
an equal mass of H2O could have more energy in a variety of mechanical ways (temperate indicates heat capacity, water behind a dam can run a hydro electric plant), but since you asked this in 'chemistry', I think the gas version is the 'correct' answer.

Answer 2

In this question, water is lower in energy than the two gases together. When the two gasses come together to form water (you need a spark to get the reaction going), energy is released in the form of heat. Oxygen is more stable in the H2O molecule (water) than in the O2 molecule (oxygen gas) because in O2, each oxygen molecule has a double bond to the other oxygen atom. In water all the bonds are single bonds, which are less energetic than double bonds (think of it as less stressful on the individual atoms...sharing one pair of electrons is not too stressful, but sharing two pairs of electrons is).

Answer 3

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