CHEM 221 LAB

Which of the following statements is true according to the text?

• The volume of an object decreases with increasing temperature.

• The density of water decreases continuously as the temperature increases from 0 to 4°C.

• The density of a gas does not depend on the pressure.

• The density of matter generally decreases with an increase in temperature due to thermal expansion.

What is the SI unit of density?

• g/cm³

• kg/m³

• lbs/in³

• ounces/ft³

What is the purpose of the capillary hole in the stopper of a pycnometer?

• To measure the mass of the liquid

• To release spare liquid and ensure accurate volume measurement

• To increase the pressure inside the pycnometer

• To prevent the liquid from evaporating

ow is the density of a liquid determined using a pycnometer?

• By measuring the volume of the liquid and dividing it by the mass of the pycnometer

• By using the mass of the liquid and the experimentally determined mass of water

• By dividing the mass of the liquid by the volume of water that fills the pycnometer

• By subtracting the mass of the empty pycnometer from the mass of the pycnometer filled with the liquid

What is the first step in the procedure for density determination of a solid using a pycnometer?

• Fill the pycnometer with distilled water.

• Measure the weight of empty, dry pycnometer.

• Add water to the pycnometer with the solid object inside.

• Calculate the mass of water added to the pycnometer.

What was used to dry the spare water that leaks through the capillary hole when using a pycnometer?

• A dry towel

• A sponge

• Tissue paper

• A hair dryer

How is the volume of the solid object (Vs​) calculated according to the procedure?

• Vs​=V−VH2O​

• Vs​=mH2O​−mH2O​

• Vs=mH2O/ρH2O

• Vs​=V−VH2O​

Which of the following materials is NOT listed as required for the viscosity determination experiment?

• Nessler’s tube

• Thermometer

• Digital multimeter

• Stopwatch

According to the discussion section, what is a characteristic of Newtonian fluids?

• They show variable viscosity at different temperatures.

• They exhibit constant viscosity over a whole range of flows.

• They behave like high density solutions such as honey.

• They are typically gases or low-density liquids.

What is the correct order of steps for preparing and measuring the glycerol solution according to the procedure listed?

• Tare a graduated cylinder, pour in glycerol, pour into Nessler’s tube, and then measure mass.

• Tare a graduated cylinder, measure the mass, pour in glycerol, and then mark the tube.

• Obtain glycerol solution, measure its mass, pour into Nessler’s tube, and then tare a graduated cylinder.

• Obtain glycerol, tare a graduated cylinder, pour into Nessler’s tube, and then measure mass.