3. Water
Properties of Water- Cohesion and Adhesion
Video duration:
1mSkip to main content
Alright. So here we have an example problem that wants us to fill in the blank in this sentence using one of these 4 potential answer options down below. And the example problem says, cohesion, surface tension, and adhesion are properties of water molecules that blank. And option a says, increases with temperature. Now in our last lesson video, we never mentioned that these properties, cohesion, surface tension, and adhesion will actually increase with temperature. And in fact this is not going to be true. So we can eliminate option a for that reason. Option b says that it will increase with pH and once again we never mentioned this in our previous lesson videos and this is simply not going to be true. So now we're between either option c or option d, and option c says, are a result of non polar covalent bonding. But of course we know from our previous lesson videos that water molecules are held together, using polar covalent bonds, not non polar covalent bonds, and so the non polar here makes this part false. And so of course this only leaves option d here as the correct answer. And so cohesion, surface tension, and adhesion are all properties of water molecules that are a result of hydrogen bonding. And so option d here is the correct answer to this practice problem. And really, it's the hydrogen bonding that water molecules are capable of forming that allow water to have cohesive and adhesive properties and to create a relatively high surface tension. And so this here concludes this example problem, and I'll see you all in our next video.
03:52
