Q: A nurse needs to administer 0.250 grams of a medication. The tablets available are 50.0 milligrams each. How many tablets should the nurse give?

$$0.250 \times 1000 \div 50.0 = 5$$ tablets

Q: Convert 2.44 meters to centimeters.

$$2.44 \times 100 = 244$$ centimeters

Q: A doctor orders 0.150 mg of Synthroid. Tablets are available as 50.0 mcg each. How many tablets are needed?

$$0.150 \times 1000 \div 50.0 = 3$$ tablets

Q: A patient receives 3.0 pints of blood during surgery. If the density of blood is $$1.06 \ \mathrm{g/mL}$$, how many kilograms of blood were transfused? (1 pint = 473 mL)

$$3.0 \times 473 \times 1.06 \div 1000 = 1.5 kg$$

Q: How many minutes are in 1.6 days?

$$1.6 \times 24 \times 60 = 2304$$ minutes

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 grams of a medication. The tablets available are 50.0 milligrams each. How many tablets should the nurse give?

Accepted Answer

$$0.250 	imes 1000 \div 50.0 = 5$$ tablets

Question 3

Which of the following numbers has three significant figures?

Accepted Answer

0.00450

Question 4

A patient’s body temperature is measured as 38.6 °C. Which of the following is the correct SI unit for temperature?

Accepted Answer

Kelvin (K)

Question 5

Convert 2.44 meters to centimeters.

Accepted Answer

$$2.44 	imes 100 = 244$$ centimeters

Question 6

Which of the following is an exact number?

Accepted Answer

There are 3 coins in a pocket

Question 7

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

Accepted Answer

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

Question 8

Which of the following equalities is correct?

Accepted Answer

1 meter = 100 centimeters

Question 9

A doctor orders 0.150 mg of Synthroid. Tablets are available as 50.0 mcg each. How many tablets are needed?

Accepted Answer

$$0.150 	imes 1000 \div 50.0 = 3$$ tablets

Question 10

Which of the following is the correct relationship between milliliters and liters?

Accepted Answer

1 L = 1000 mL

Question 11

A patient receives 3.0 pints of blood during surgery. If the density of blood is $$1.06 \ \mathrm{g/mL}$$, how many kilograms of blood were transfused? (1 pint = 473 mL)

Accepted Answer

$$3.0 	imes 473 	imes 1.06 \div 1000 = 1.5 kg$$

Question 12

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

Question 13

Which of the following is the correct conversion factor for the equality 1 kilogram = 1000 grams?

Accepted Answer

$$\frac{1 \ \mathrm{kg}}{1000 \ \mathrm{g}}$$

Question 14

A solution contains 0.125 mg of a drug per 1 mL. Which number is exact and which has significant figures?

Accepted Answer

1 mL is exact; 0.125 mg has significant figures

Question 15

Which of the following is the correct equality for converting inches to centimeters?

Accepted Answer

1 inch = 2.54 centimeters

Question 16

How many minutes are in 1.6 days?

Accepted Answer

$$1.6 	imes 24 	imes 60 = 2304$$ minutes

Question 17

Which of the following is the correct definition of density?

Accepted Answer

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

Question 18

A liquid has a density of $$1.32 \ \mathrm{g/mL}. $$What is the volume in mL of a 14.7 g sample?

Accepted Answer

$$\frac{14.7}{1.32} = 11.1 mL$$

Question 19

Which of the following is a correct metric prefix and its value?

Accepted Answer

centi = $$10^{-2}$$

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

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