Q: A sample of cough syrup has a density of 1.20 g/mL. If a patient takes 2.0 teaspoons (1 tsp = 5.0 mL), what is the mass of syrup consumed?

$$2.0\ \mathrm{tsp} \times 5.0\ \mathrm{mL/tsp} \times 1.20\ \mathrm{g/mL} = 12\ \mathrm{g}$$

Question 1

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

Accepted Answer

kelvin (K)

Question 2

A student measures the mass of a sample as 0.0250 g. How many significant figures are in this measurement?

Accepted Answer

4

Question 3

Which of the following numbers is an exact number?

Accepted Answer

2.54 cm in 1 inch

Question 4

A graduated cylinder contains 25.0 mL of water. After adding a metal object, the volume rises to 33.0 mL. If the mass of the metal is 48.0 g, what is its density?

Accepted Answer

$$\frac{48.0}{8.0} = 6.0\ \mathrm{g/cm^3$}$$

Question 5

Which prefix represents a factor of $$10^{-6}$$?

Accepted Answer

micro

Question 6

A medication is available in 250-mg capsules. If a doctor prescribes 1.0 g of the medication, how many capsules should the patient take?

Accepted Answer

$$\frac{1000\ \mathrm{mg}}{250\ \mathrm{mg}} = 4$$ capsules

Question 7

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros at the end of a decimal number are significant.

Question 8

A person walks at a pace of 65 meters per minute. How many minutes will it take to walk 7.5 kilometers?

Accepted Answer

$$\frac{7500\ \mathrm{m}}{65\ \mathrm{m/min}} = 120$$ min

Question 9

Which of the following is the correct conversion factor for the equality 1 L = 1000 mL?

Accepted Answer

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

Question 10

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

Accepted Answer

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

Question 11

Which of the following is NOT a measured number?

Accepted Answer

The number of students in a classroom

Question 12

A nurse needs to administer 0.15 mg of Synthroid. If each tablet contains 75 mcg of Synthroid, how many tablets are required?

Accepted Answer

$$\frac{150\ \mathrm{mcg}}{75\ \mathrm{mcg}} = 2$$ tablets

Question 13

Which of the following is the correct formula for density?

Accepted Answer

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

Question 14

A bottle contains 1.5 L of water. Which physical quantity does this measurement describe?

Accepted Answer

Volume

Question 15

Which of the following is the largest unit?

Accepted Answer

kilogram

Question 16

A sample of cough syrup has a density of 1.20 g/mL. If a patient takes 2.0 teaspoons (1 tsp = 5.0 mL), what is the mass of syrup consumed?

Accepted Answer

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

Question 17

Which of the following is the correct definition of specific gravity?

Accepted Answer

Specific gravity = density of sample $$\div$$ density of water

Question 18

When multiplying or dividing measured numbers, how should the final answer be rounded?

Accepted Answer

To the same number of significant figures as the measurement with the fewest significant figures

Chapter 2: Chemistry and Measurements – GOB Chemistry Study Notes

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