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℃.
21. According to Figure 1, does ethanol or 1-propanol flow more easily at 25°C ?
Your Answer is
Correct Answer is B
Explanation
Look at figure 1, when the abscissa temperature is 25 degrees, the ordinate viscosity of ethanol is about 1.00;
At this time, the ordinate of 1-propanol is about 2.00, so the viscosity of ethanol is low, More fluid