Q: What is the volume of a cylinder with a radius of 2 cm and a height of 10 cm? Use $$V = \\pi \\times r^2$ \\times h.$$

$$V = \\pi \\times (2)^2$ \\times 10 = 125.7 cm$^3$$

Q: Which of the following is the correct formula for density?

$$\\text{Density} = \\frac{\\text{Mass}}{\\text{Volume}}$$

Q: You are asked to give a patient 5 mL of medicine per 100 lbs body weight. How many mL would you give a patient who weighs 85 kg? (Use $$1 ext{ kg} = 2.2 ext{ lbs})$$

$$85 \\times 2.2 = 187$$ lbs; $$\\frac{187}{100} \\times 5 = 9.35 mL$$

Q: If a woman in childbirth has a fully dilated cervix of 10 cm in diameter, how many inches is that? (Use $$1 ext{ inch} = 2.54 ext{ cm})$$

$$10 \\div 2.54 = 3.94$$ inches

Q: A patient is a 160 lb woman who needs 1.0 mg of medicine for every kilogram of body weight. How much medicine should she get? (Use $$1 ext{ kg} = 2.2 ext{ lb})$$

$$160 \\div 2.2 = 72.7 kg$$; $$72.7 \\times 1.0 = 72.7 mg$$

Q: Which of the following is the correct conversion factor for inches to centimeters?

$$1 \\text{ inch} = 2.54 \\text{ cm}$$

Question 1

Which of the following is the correct metric prefix for one thousandth ($$1/1000) of a $$unit?

Accepted Answer

milli-

Question 2

A patient weighs 185 lb. How many kilograms does the patient weigh? (Use $$1 	ext{ lb} = 0.454 	ext{ kg})$$

Accepted Answer

$$185 	imes 0.454 = 84.0 kg$$

Question 3

Which metric unit would be most appropriate to measure the volume of medicine in a teaspoon?

Accepted Answer

milliliter (mL)

Question 4

What is the volume of a cylinder with a radius of 2 cm and a height of 10 cm? Use $$V = \pi \times r^2$ \times h.$$

Accepted Answer

$$V = \pi \times (2)^2$ \times 10 = 125.7 cm$^3$$

Question 5

If a medicine has a density of $$50 g/mL$$, how many mL would you need to give a $$100 g $$dose?

Accepted Answer

$$100 \div 50 = 2 mL$$

Question 6

Which of the following is the correct formula for density?

Accepted Answer

$$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$$

Question 7

A car's gas tank holds 15 gallons. How many liters is this? (Use $$1 	ext{ gal} = 3.79 	ext{ L})$$

Accepted Answer

$$15 \times 3.79 = 56.85 L$$

Question 8

Which metric prefix represents one millionth ($$1/1,000,000) of a $$unit?

Accepted Answer

micro-

Question 9

A block has a mass of 200 g and a volume of 50 mL. What is its density?

Accepted Answer

$$\frac{200}{50} = 4 g/mL$$

Question 10

You are asked to give a patient 5 mL of medicine per 100 lbs body weight. How many mL would you give a patient who weighs 85 kg? (Use $$1 	ext{ kg} = 2.2 	ext{ lbs})$$

Accepted Answer

$$85 \times 2.2 = 187$$ lbs; $$\frac{187}{100} \times 5 = 9.35 mL$$

Question 11

Which of the following is NOT a standard metric unit?

Accepted Answer

inch (in)

Question 12

A stick of butter weighs 4 oz. How many grams is that? (Use $$1 	ext{ oz} = 28 	ext{ g})$$

Accepted Answer

$$4 \times 28 = 112 g$$

Question 13

Which metric prefix means one hundredth ($$1/100) of a $$unit?

Accepted Answer

centi-

Question 14

If a woman in childbirth has a fully dilated cervix of 10 cm in diameter, how many inches is that? (Use $$1 	ext{ inch} = 2.54 	ext{ cm})$$

Accepted Answer

$$10 \div 2.54 = 3.94$$ inches

Question 15

Which laboratory glassware is most accurate for measuring liquid volume?

Accepted Answer

Graduated cylinder

Question 16

A patient is a 160 lb woman who needs 1.0 mg of medicine for every kilogram of body weight. How much medicine should she get? (Use $$1 	ext{ kg} = 2.2 	ext{ lb})$$

Accepted Answer

$$160 \div 2.2 = 72.7 kg$$; $$72.7 \times 1.0 = 72.7 mg$$

Question 17

Which of the following is the correct conversion factor for inches to centimeters?

Accepted Answer

$$1 \text{ inch} = 2.54 \text{ cm}$$

Question 18

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the measure of the quantity of matter; weight is the force of gravity acting on that mass.

Question 19

A bottle contains 2 liters of liquid. How many quarts is this? (Use $$1 \text{ quart} = 0.95 \text{ L})$$

Accepted Answer

$$2 \div 0.95 = 2.11$$ quarts

The Metric System: Units, Measurement, and Conversions in GOB Chemistry

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