Assignment

1. In an experiment with an Ostwald viscometer, the flow times of water and ethanol are 80 s and 175 s at 20 °C. The density of water = 0.998 g·cm⁻³ and that of ethanol = 0.790 g·cm⁻³. The viscosity of water at 20 °C is 0.01008 poise. Calculate the viscosity of ethanol.
2. An experiment measured the flow rates of four different liquids as temperature was increased. According to the graph, which of the liquids had the greatest viscosity at 30 °C?

   

   1. Liquid A
   2. Liquid B
   3. Liquid C
   4. Liquid D
3. The dimensional formula of the coefficient of viscosity is __________.
4. How does the viscosity of a liquid change with temperature?
5. In an experiment with an Ostwald viscometer, the viscosities of toluene and water at 30 °C are 0.579 poise and 0.8007 poise, respectively. The flow times of water and toluene are 41 s and 34.5 s. The density of water is 1.002 g·cm⁻³. Calculate the density of toluene.