Q: A nurse needs to administer 0.250 g of a medication. The tablets available are 50 mg each. How many tablets should the nurse give?

$$0.250 \text{ g} \times \frac{1000 \text{ mg}}{1 \text{ g}} = 250 \text{ mg};\ 250 \div 50 = 5$$ tablets

Q: A sample of metal has a mass of 48.0 g and displaces water from 25.0 mL to 33.0 mL in a graduated cylinder. What is the density of the metal?

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

Q: Convert 2.44 meters to centimeters.

$$2.44\ \text{m} \times \frac{100\ \text{cm}}{1\ \text{m}} = 244\ \text{cm}$$

Q: A patient is prescribed 0.150 mg of Synthroid. If each tablet contains 75 mcg, how many tablets are needed?

$$0.150\ \text{mg} \times \frac{1000\ \text{mcg}}{1\ \text{mg}} = 150\ \text{mcg};\ 150 \div 75 = 2$$ tablets

Q: How many minutes are in 1.4 days?

$$1.4\ \text{days} \times \frac{24\ \text{h}}{1\ \text{day}} \times \frac{60\ \text{min}}{1\ \text{h}} = 2016\ \text{min}$$

Q: A liquid has a density of 1.32 g/mL. What is the volume in mL of a 14.7 g sample?

$$\frac{14.7\ \text{g}}{1.32\ \text{g/mL}} = 11.1\ \text{mL}$$

Q: Which of the following is the correct equality for the prefix 'centi-'?

$$1\ \text{cm} = 0.01\ \text{m}$$

Q: A nurse needs to prepare 10.0 mL of a solution. Which of the following is the correct conversion to liters?

$$10.0\ \text{mL} \times \frac{1\ \text{L}}{1000\ \text{mL}} = 0.0100\ \text{L}$$

Q: Which of the following is the correct definition of density?

$$\text{Density} = \frac{\text{mass}}{\text{volume}}$$

Question 1

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

Accepted Answer

kilogram (kg)

Question 2

A nurse needs to administer 0.250 g of a medication. The tablets available are 50 mg each. How many tablets should the nurse give?

Accepted Answer

$$0.250 	ext{ g} 	imes \frac{1000 	ext{ mg}}{1 	ext{ g}} = 250 	ext{ mg};\ 250 \div 50 = 5$$ tablets

Question 3

Which of the following numbers has three significant figures?

Accepted Answer

0.00450

Question 4

A sample of metal has a mass of 48.0 g and displaces water from 25.0 mL to 33.0 mL in a graduated cylinder. What is the density of the metal?

Accepted Answer

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

Question 5

Which of the following is an exact number?

Accepted Answer

The number of eggs in a dozen

Question 6

Convert 2.44 meters to centimeters.

Accepted Answer

$$2.44\ 	ext{m} 	imes \frac{100\ 	ext{cm}}{1\ 	ext{m}} = 244\ 	ext{cm}$$

Question 7

A patient is prescribed 0.150 mg of Synthroid. If each tablet contains 75 mcg, how many tablets are needed?

Accepted Answer

$$0.150\ 	ext{mg} 	imes \frac{1000\ 	ext{mcg}}{1\ 	ext{mg}} = 150\ 	ext{mcg};\ 150 \div 75 = 2$$ tablets

Question 8

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros at the end of a decimal number are significant.

Question 9

How many minutes are in 1.4 days?

Accepted Answer

$$1.4\ 	ext{days} 	imes \frac{24\ 	ext{h}}{1\ 	ext{day}} 	imes \frac{60\ 	ext{min}}{1\ 	ext{h}} = 2016\ 	ext{min}$$

Question 10

A liquid has a density of 1.32 g/mL. What is the volume in mL of a 14.7 g sample?

Accepted Answer

$$\frac{14.7\ 	ext{g}}{1.32\ 	ext{g/mL}} = 11.1\ 	ext{mL}$$

Question 11

Which of the following is the correct equality for the prefix 'centi-'?

Accepted Answer

$$1\ 	ext{cm} = 0.01\ 	ext{m}$$

Question 12

A nurse needs to prepare 10.0 mL of a solution. Which of the following is the correct conversion to liters?

Accepted Answer

$$10.0\ 	ext{mL} 	imes \frac{1\ 	ext{L}}{1000\ 	ext{mL}} = 0.0100\ 	ext{L}$$

Question 13

Which of the following is the correct definition of density?

Accepted Answer

$$	ext{Density} = \frac{	ext{mass}}{	ext{volume}}$$

Question 14

A patient walks 7.5 km on a treadmill at a pace of 65 meters per minute. How many minutes does it take to complete the walk?

Accepted Answer

$$7.5\ 	ext{km} 	imes \frac{1000\ 	ext{m}}{1\ 	ext{km}} = 7500\ 	ext{m};\ 7500 \div 65 = 115\ 	ext{min}$$

Question 15

Which of the following is the correct SI unit for temperature?

Accepted Answer

Kelvin (K)

Question 16

Which of the following is a correct conversion factor for the equality $$1\ 	ext{L} = 1000\ 	ext{mL}$$?

Accepted Answer

$$\frac{1\ 	ext{L}}{1000\ 	ext{mL}}$$

Question 17

A solution contains 18% gold by mass. Which equality and conversion factor correctly represent this percentage?

Accepted Answer

100 g jewelry = 18 g gold; $$\frac{18\ 	ext{g gold}}{100\ 	ext{g jewelry}}$$

Chemistry and Measurements: Structured Study Notes for GOB Chemistry

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