Account for the observation that ethyl alcohol, ImageImageOH, dissolves readily in water but dimethyl ether, CImageOCImage, which has the same number and kinds of atoms, does not.
A) The hydrogens on the dimethyl ether surround the molecule, shielding the inner atoms from interacting with the water.
B) Because the carbons arrange themselves in a straight line, the ethanol can interact more easily with more water molecules, thus increasing its solubility.
C) The high electronegativity of the carbon-oxygen-carbon bond on dimethyl ether creates a strong dipole charge on the ends of the molecule, making it highly soluble in water.
D) Because dimethyl ether lacks an -OH group, it is significantly less polar than is ethyl alcohol and is not readily soluble in water.
Question 2
How necessary is soap for removing salt from your hands?
A) Soap is necessary because it has both a polar and nonpolar end to interact with the positive and negative ions in the salt.
B) Soap is necessary because it creates a film on the surface of your skin, shielding it from interacting with the ionic charges of the salt.
C) Soap is not at all necessary for removing salt from your hands. The strong ion-dipole interactions between fresh water and the salt are most sufficient to lift the salt away from your hands.
D) Soap is not necessary because there are no electrical charges on the skin of your hands for the salt to interact with.
Effect of extracellular osmolarity on water movement across a plasma membrane
Water-soluble organic molecules.
The movement of water vapor molecules exerts vapor pressure on surfaces.
Two Zebras Drinking Water
Water strider (Gerris remigis) on water surface, showing surface tension.
Water-conserving structures in a transverse section of pincushion leaf (Hakea laurina)