They are called "hydrophobic", literally meaning scared of water - and yes, that's really a chemistry term!
Surface tension, place a drop of detergent on the water and it breaks the meniscus allowing the water to flow away. Also the cohesion makes the water molecules stay together. It is not because of the ridge.
Hydrophobic molecules are water-fearing and tend to avoid interactions with water or other polar molecules. These molecules typically have nonpolar regions that make them incompatible with the polar nature of water, causing them to aggregate or form separate phases in aqueous solutions.
days
try to stay away from all moving water
water repellent forms a smooth coating over the tiny holes in fabric. the coating is so smooth that the gaps in it are smaller than water molecules. because the water molecules cannot pass through the protective coating, they stay on the surface where they can be easily wiped away.
months
days
Soaps are complex combinations of molecules. On the surface of the soap there are many holes and spaces between the molecules that the water can enter. There the water molecules come in and probably penetrate many layers deep into the soap, and stay there. Thus the soap expands and becomes bigger. This happens most in pure water and then less in liquids which not like water. The reason for the difference is that inside the soap there are both "hydrophilic" (water liking) and "hydrophobic" (water hating) portions of the molecules. But importantly, the hydrophilic portions are on the outside of the molecules so water can get close to the molecules. So the more like water the liquid is, the more the water can get close to the molecules and stay with them (be absorbed into the soap). When the water has other particles dissolved in it, like iced tea, Sprite or salt water, the water molecules can't get as close to the hydrophilic portions. And of course the oil molecules are repelled by the hydrophilic portions of the soap. So the answer of why soap absorbs the water is that the water molecules penetrate the soap and stay with the hydrophilic portions of the soap molecules. This happens more when the liquid is more like water.
This tendency of water molecules to stick together is known as cohesion, which is a result of the hydrogen bonds between the molecules. This cohesion gives water its high surface tension and ability to form droplets.
Whe you boil water, molecules of water "escape" into the atmosphere. The molecular structure of water is unaffected by boiling.
when the molecules of the A-b powered atoms combine with the hot water the liquid becomes one atomic atom which then represents the liquid which makes the water stay at its cold temperature which it will stay at until the molecules are solidified by the surrounding temperature.
Nothing they stay the same - their density changes.