1
answer
0
watching
122
views
11 Nov 2019
use the first page to answer 2-5 please :) LAB&Properties of Soap and Surface Tension 57 DSCH Polar head group Non-polar tail group FIGURE 2. Structure of an amphiphilic molecule, showing the hydrophilic and hydrophobic portions of the molecule, and a schematic representation of the molecule. H2O Oil FIGURE 3. A micelle of oil and amphiphilic molecules in water is shown. The hydropho- bic tails of the amphiphiles are dissolved in the oil (non-polar), while the hydrophilic heads are dissolved in the surrounding water (polar). Surface lension Surface tension of water is caused by the water molecules at the surface being at a higher state of energy than the water molecules in the bulk of the water. A water mol- ecule is at a lower state of energy when it is surrounded by other water molecules, forming the maximum amount of hydrogen bonds. When it is at the interface of air (or another medium) and water, it cannot form all the possible hydrogen bonds (imagine it). As such, the water molecules on the surfaces are being pulled into the bulk to achieve a lower state of energy and all the possible hydrogen bonds with other water molecules. Although this pulling force is balanced by the incompressibility of the liq- uid, when the shape of a volume of liquid water is allowed to change such as in a grav- ity free space, the volume of water would tend to minimize its surface area so that the
use the first page to answer 2-5 please :)
LAB&Properties of Soap and Surface Tension 57 DSCH Polar head group Non-polar tail group FIGURE 2. Structure of an amphiphilic molecule, showing the hydrophilic and hydrophobic portions of the molecule, and a schematic representation of the molecule. H2O Oil FIGURE 3. A micelle of oil and amphiphilic molecules in water is shown. The hydropho- bic tails of the amphiphiles are dissolved in the oil (non-polar), while the hydrophilic heads are dissolved in the surrounding water (polar). Surface lension Surface tension of water is caused by the water molecules at the surface being at a higher state of energy than the water molecules in the bulk of the water. A water mol- ecule is at a lower state of energy when it is surrounded by other water molecules, forming the maximum amount of hydrogen bonds. When it is at the interface of air (or another medium) and water, it cannot form all the possible hydrogen bonds (imagine it). As such, the water molecules on the surfaces are being pulled into the bulk to achieve a lower state of energy and all the possible hydrogen bonds with other water molecules. Although this pulling force is balanced by the incompressibility of the liq- uid, when the shape of a volume of liquid water is allowed to change such as in a grav- ity free space, the volume of water would tend to minimize its surface area so that the
Nestor RutherfordLv2
19 Mar 2019