Passage IV
Alcohols are carbon compounds that contain a hydroxyl (-OH) group bonded to a C atom. If the hydroxyl-bonded C atom is bonded to only one other C atom, or to no other C atoms, the alcohol is a primary alcohol. Table 1 lists the chemical formula, melting point, and boiling point for several primary alcohols.
Figure 1 shows how the viscosity (in centipoise, cp)of 3 primary alcohols varies with temperature.
Figure 2 shows how the viscosity of aqueous solutions of the same 3 alcohols varies with alcohol concentration at 20℃.
17. According to Figure 2, as the percent H2O by mass in an ethanol/H2O solution increases from 0% to 100%, the viscosity:
Your Answer is
Correct Answer is D
Explanation
When percent H2O increases, that is percent ethanol decreases. Look at figure 2, when the abscissa decreases, the ordinate viscosity of ethanol first increases and then decreases