Question 1

A student measures the mass of a metal block as 42.0 g and its volume as 6.0 cm$$^3. $$What is the density of the metal block?

Accepted Answer

$$7.0\ \mathrm{g/cm^3$}$$

Question 2

Which of the following best describes why it is important to read the meniscus at eye level when measuring liquid volume in a graduated cylinder?

Accepted Answer

To avoid parallax error and ensure an accurate volume reading

Question 3

A student wants to determine the density of an irregularly shaped rock. She finds its mass to be 18.0 g. She places the rock in a graduated cylinder containing 25.0 mL of water, and the water level rises to 32.5 mL. What is the density of the rock?

Accepted Answer

$$2.4\ \mathrm{g/cm^3$}$$

Question 4

When using an electronic balance, why is it important to 'tare' the balance before measuring the mass of a sample?

Accepted Answer

To ensure the mass reading does not include the mass of the container

Question 5

A 10 mL graduated cylinder is used to measure 6.62 mL of a liquid. Which of the following best describes how to properly record this measurement?

Accepted Answer

Record all certain digits plus one estimated digit

Question 6

You pour together three immiscible liquids with densities of $$1.2\ \mathrm{g/cm^3$}$$, $$0.8\ \mathrm{g/cm^3$}$$, and $$1.0\ \mathrm{g/cm^3$}. $$Which statement correctly describes the arrangement of the layers from bottom to top?

Accepted Answer

The $$1.2\ \mathrm{g/cm^3$}$$ liquid will be at the bottom, $$1.0\ \mathrm{g/cm^3$} in $$the middle, and $$0.8\ \mathrm{g/cm^3$} at $$the top.

Question 7

A student weighs a beaker and finds its mass to be 120.000 g. After adding a sample, the total mass is 123.456 g. What is the mass of the sample?

Accepted Answer

$$3.456\ \mathrm{g}$$

Question 8

Which of the following statements about density is correct?

Accepted Answer

Density is an intensive property and does not depend on the amount of substance.

Question 9

A student uses a pipet to transfer 10.00 mL of water into a beaker. The mass of the beaker increases by 9.98 g. What is the experimental density of water based on this measurement?

Accepted Answer

$$0.998\ \mathrm{g/mL}$$

Question 10

If you have 1 kg of rocks and 1 kg of feathers, which statement is true?

Accepted Answer

Both have the same mass, but the feathers occupy a greater volume.

Question 11

A student incorrectly reads the meniscus from above eye level and records a volume of 25.0 mL. The actual volume is 24.5 mL. What type of error has occurred?

Accepted Answer

Parallax error, leading to an overestimation of the volume

Question 12

Which of the following is the correct formula for density?

Accepted Answer

$$D = \frac{m}{V}$$

Question 13

A marble has a mass of 3.0 g. When placed in a graduated cylinder, the water level rises from 25.0 mL to 26.1 mL. What is the density of the marble?

Accepted Answer

$$2.7\ \mathrm{g/cm^3$}$$

Question 14

Why should you avoid touching objects with your bare hands when weighing them on an electronic balance?

Accepted Answer

Oils and moisture from your hands can alter the mass reading

Question 15

A student pours oil (density $$0.92\ \mathrm{g/cm^3$}) $$and water (density $$1.00\ \mathrm{g/cm^3$}) $$into a beaker. Where will the oil be located relative to the water?

Accepted Answer

The oil will float on top of the water

Question 16

A student measures the mass of a sample three times and gets values of 5.01 g, 5.00 g, and 5.02 g. The true mass is 5.50 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate

Question 17

A rectangular block has dimensions 4.0 cm × 2.0 cm × 1.5 cm and a mass of 24.0 g. What is its density?

Accepted Answer

$$2.0\ \mathrm{g/cm^3$}$$

Question 18

Which of the following would most likely cause a systematic error in a density experiment?

Accepted Answer

Consistently reading the meniscus from above eye level

Question 19

A student uses the water displacement method to find the volume of a metal object. The initial water level is 40.0 mL, and after adding the object, the level rises to 47.5 mL. If the mass of the object is 30.0 g, what is its density?

Accepted Answer

$$4.0\ \mathrm{g/cm^3$}$$

Density and the Use of Volumetric Glassware

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