Increasing the temperature of a water sample from 25c to...

Increasing the temperature of a water sample from 25°C to 100°C will result in… Group of answer choices A) The separation of the hydrogen molecules from the oxygen molecule in water B) The formation of more hydrogen bonds between water molecules C) A decrease in hydrogen bonding as the water molecules move more rapidly D) Something called “Vapor Bonds”, only present when water boils

Transcript

00:01 So here we're taking a look at four different options as to what may be happening as we increase the temperature of water that's already boiling.

00:10 So we'll go through the choices one by one and see what's happening here.

00:15 So we look at the first option and we see disrupt non -covalent forces.

00:20 So the non -covalent forces between water are the intermolecular forces and primarily in water we have hydrogen bonding.

00:27 So here we can see in the figure the interactions between the hydrogen, of one oxygen or one water molecule with the oxygen of another water molecule.

00:37 And the hydrogen is a positive dipole, the oxygen is a negative dipole.

00:42 And so what this option suggests is that increasing the heat is going to break these hydrogen bonds, allowing more water to escape as water vapor.

00:59 So based on what we know, that is a very reasonable explanation, so we'll consider that.

01:06 Now let's look at the second option.

01:10 Increasing the temperature will break covalent bonds between hydrogen and oxygen.

01:15 So this is suggesting that these bonds here, these bonds here between hydrogens and oxygens within one molecule, covalent bonds will be broken.

01:30 So the bonds between oxygen and hydrogen within one molecule have very high energy.

01:34 And so a lot, a lot of energy would be needed to break these bonds.

01:38 And so we're not really going to see that happen because the amount added to boiling water is just not going to be enough to break those bonds...

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