Q: A patient’s blood sample has a mass of 5.60 g and a volume of 5.30 mL. What is the density of the blood sample?

$$\text{Density} = \frac{5.60\ \mathrm{g}}{5.30\ \mathrm{mL}} = 1.06\ \mathrm{g/mL}$$

Q: A doctor prescribes 0.250 g of a medication. The tablets available are 50 mg each. How many tablets should be given?

$$0.250\ \mathrm{g} \times \frac{1000\ \mathrm{mg}}{1\ \mathrm{g}} \times \frac{1\ \text{tablet}}{50\ \mathrm{mg}} = 5\ \text{tablets}$$

Q: A sample of urine has a density of 1.015 g/mL. What is its specific gravity?

$$\text{Specific gravity} = \frac{1.015\ \mathrm{g/mL}}{1.00\ \mathrm{g/mL}} = 1.015$$

Q: A nurse needs to convert 2.5 hours to seconds. What is the correct calculation?

$$2.5\ \mathrm{h} \times \frac{60\ \mathrm{min}}{1\ \mathrm{h}} \times \frac{60\ \mathrm{s}}{1\ \mathrm{min}} = 9000\ \mathrm{s}$$

Q: Which of the following is the correct density calculation for a metal sample with a mass of 48.0 g and a volume of 8.0 mL?

$$\text{Density} = \frac{48.0\ \mathrm{g}}{8.0\ \mathrm{mL}} = 6.0\ \mathrm{g/mL}$$

Q: A patient walks 7.5 km on a treadmill at a pace of 65 m/min. How many minutes does it take?

$$7.5\ \mathrm{km} \times \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} \times \frac{1\ \mathrm{min}}{65\ \mathrm{m}} = 120\ \mathrm{min}$$

Question 1

Which of the following is the correct SI unit for measuring mass?

Accepted Answer

kilogram (kg)

Question 2

A nurse measures a patient’s temperature as $$38.5\ ^\circ\mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$K = ^\circ\mathrm{C} + 273.15 = 38.5 + 273.15 = 311.65\ \mathrm{K}$$

Question 3

Which of the following measurements contains three significant figures?

Accepted Answer

0.00476

Question 4

A medication contains 0.50 g of aspirin. Is this number measured or exact, and how many significant figures does it have?

Accepted Answer

Measured; 2 significant figures

Question 5

Which of the following is the correct equality and conversion factors for liters and milliliters?

Accepted Answer

$$1\ \mathrm{L} = 1000\ \mathrm{mL}$$; $$\frac{1\ \mathrm{L}}{1000\ \mathrm{mL}}$$ and $$\frac{1000\ \mathrm{mL}}{1\ \mathrm{L}}$$

Question 6

A patient’s blood sample has a mass of 5.60 g and a volume of 5.30 mL. What is the density of the blood sample?

Accepted Answer

$$	ext{Density} = \frac{5.60\ \mathrm{g}}{5.30\ \mathrm{mL}} = 1.06\ \mathrm{g/mL}$$

Question 7

Which of the following is an example of an exact number?

Accepted Answer

1 ft = 12 in.

Question 8

A doctor prescribes 0.250 g of a medication. The tablets available are 50 mg each. How many tablets should be given?

Accepted Answer

$$0.250\ \mathrm{g} 	imes \frac{1000\ \mathrm{mg}}{1\ \mathrm{g}} 	imes \frac{1\ 	ext{tablet}}{50\ \mathrm{mg}} = 5\ 	ext{tablets}$$

Question 9

Which of the following numbers has four significant figures?

Accepted Answer

0.02250

Question 10

A sample of urine has a density of 1.015 g/mL. What is its specific gravity?

Accepted Answer

$$	ext{Specific gravity} = \frac{1.015\ \mathrm{g/mL}}{1.00\ \mathrm{g/mL}} = 1.015$$

Question 11

Which metric prefix represents $$10^{-6}$$?

Accepted Answer

micro

Question 12

A nurse needs to convert 2.5 hours to seconds. What is the correct calculation?

Accepted Answer

$$2.5\ \mathrm{h} 	imes \frac{60\ \mathrm{min}}{1\ \mathrm{h}} 	imes \frac{60\ \mathrm{s}}{1\ \mathrm{min}} = 9000\ \mathrm{s}$$

Question 13

Which of the following is the correct density calculation for a metal sample with a mass of 48.0 g and a volume of 8.0 mL?

Accepted Answer

$$	ext{Density} = \frac{48.0\ \mathrm{g}}{8.0\ \mathrm{mL}} = 6.0\ \mathrm{g/mL}$$

Question 14

A patient walks 7.5 km on a treadmill at a pace of 65 m/min. How many minutes does it take?

Accepted Answer

$$7.5\ \mathrm{km} 	imes \frac{1000\ \mathrm{m}}{1\ \mathrm{km}} 	imes \frac{1\ \mathrm{min}}{65\ \mathrm{m}} = 120\ \mathrm{min}$$

Question 15

Which of the following is the correct equality and conversion factors for inches and centimeters?

Accepted Answer

$$1\ \mathrm{in.} = 2.54\ \mathrm{cm}$$; $$\frac{1\ \mathrm{in.}}{2.54\ \mathrm{cm}}$$ and $$\frac{2.54\ \mathrm{cm}}{1\ \mathrm{in.}}$$

Question 16

A nurse needs to administer 12 g of cough syrup. The syrup has a density of 1.20 g/mL and there are 5.0 mL in 1 tsp. How many teaspoons should be given?

Accepted Answer

$$12\ \mathrm{g} 	imes \frac{1\ \mathrm{mL}}{1.20\ \mathrm{g}} 	imes \frac{1\ \mathrm{tsp}}{5.0\ \mathrm{mL}} = 2.0\ \mathrm{tsp}$$

Question 17

Which of the following is the correct rule for rounding off a number when the first digit to be dropped is 5 or greater?

Accepted Answer

Increase the last retained digit by 1

Chemistry and Measurements: Units, Significant Figures, and Problem Solving

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