Q: A sample of an unknown metal has a density of $$2.14\ \text{g/cm}^3. $$What is its density in $$\text{kg/m}^3$$?

$$2.14 \times 10^3$\ \text{kg/m}^3$$

Q: Which of the following conversions is correct for expressing $$1\ \text{g/cm}^3 in$$ $$\text{kg/m}^3$$?

$$1\ \text{g/cm}^3 = 1000\ \text{kg/m}^3$$

Q: Which of the following is the correct rearrangement of the density formula to solve for mass?

$$\text{mass} = \text{density} \times \text{volume}$$

Question 1

Which of the following best defines density?

Accepted Answer

The amount of mass per unit of volume.

Question 2

Given the formula for density $$	ext{Density} = \frac{	ext{mass}}{	ext{volume}}$$, what are the typical units for density when measuring solids and liquids?

Accepted Answer

$$	ext{g/cm^3$}$$

Question 3

A sample of an unknown metal has a density of $$2.14\ 	ext{g/cm}^3. $$What is its density in $$	ext{kg/m}^3$$?

Accepted Answer

$$2.14 	imes 10^3$\ 	ext{kg/m}^3$$

Question 4

If the density of blood is $$1.060\ 	ext{kg/L}$$, how many grams of Pb would be found in $$400.0\ 	ext{mL} of $$blood at $$0.80\ 	ext{ppm}$$?

Accepted Answer

$$0.339\ 	ext{g}$$

Question 5

Which of the following conversions is correct for expressing $$1\ 	ext{g/cm}^3 in$$ $$	ext{kg/m}^3$$?

Accepted Answer

$$1\ 	ext{g/cm}^3 = 1000\ 	ext{kg/m}^3$$

Question 6

A gas has a density of $$1.25\ 	ext{g/L}. $$What is its density in $$	ext{kg/m}^3$$?

Accepted Answer

$$1.25\ 	ext{kg/m}^3$$

Question 7

Which of the following statements about density is FALSE?

Accepted Answer

Density is independent of temperature for all substances.

Question 8

A cube of metal has a mass of $$54.0\ 	ext{g}$$ and a volume of $$20.0\ 	ext{cm}^3. $$What is its density?

Accepted Answer

$$2.70\ 	ext{g/cm}^3$$

Question 9

Which real-world scenario best illustrates the importance of density?

Accepted Answer

Determining whether an object will float or sink in water.

Question 10

A chemist needs to prepare $$250.0\ 	ext{mL} of a $$solution with a density of $$0.850\ 	ext{g/mL}. $$What is the total mass of the solution?

Accepted Answer

$$212.5\ 	ext{g}$$

Question 11

If a liquid has a density of $$0.789\ 	ext{g/mL}$$, what volume would $$15.0\ 	ext{g} of $$this liquid occupy?

Accepted Answer

$$19.0\ 	ext{mL}$$

Question 12

Which of the following is the correct rearrangement of the density formula to solve for mass?

Accepted Answer

$$	ext{mass} = 	ext{density} 	imes 	ext{volume}$$

Density: Concepts, Calculations, and Applications

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