Question 1

A nurse needs to administer 0.250 g of a medication, but the tablets available are labeled as 50 mg each. How many tablets should the nurse give to the patient? (Use the correct number of significant figures in your answer.)

Accepted Answer

5 tablets

Question 2

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 3

A sample of cholesterol has a mass of 0.315 g and a volume of 0.250 mL. What is the density of the cholesterol sample in $$\mathrm{g/mL}$$? (Use the correct number of significant figures.)

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

Accepted Answer

$$1.26\ \mathrm{g/mL}$$

Question 4

Which of the following measurements contains 3 significant figures?

Accepted Answer

4.00 x $$10^{-2} L$$

Question 5

Convert 2.5 kilometers to meters using the appropriate metric prefix equality.

Accepted Answer

2500 m

Question 6

A patient’s urine sample has a specific gravity of 1.025. If the density of water is $$1.00\ \mathrm{g/mL}$$, what is the density of the urine sample?

$$	ext{Specific gravity} = \frac{	ext{density of sample}}{	ext{density of water}}$$

Accepted Answer

$$1.025\ \mathrm{g/mL}$$

Question 7

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

Accepted Answer

$$1\ \mathrm{m} = 100\ \mathrm{cm}$$

Question 8

A laboratory test result is reported as 8.4234 g. Round this value to 3 significant figures.

Accepted Answer

8.42 g

Question 9

A cube has a volume of $$10\ \mathrm{cm} 	imes 10\ \mathrm{cm} 	imes 10\ \mathrm{cm}. $$What is the volume in liters?

$$1\ \mathrm{cm}^3 = 1\ \mathrm{mL}$$, $$1000\ \mathrm{mL} = 1\ \mathrm{L}$$

Accepted Answer

1 L

Question 10

A person weighs 154 lb. What is their mass in kilograms? (Use $$1\ \mathrm{kg} = 2.20\ \mathrm{lb}$$ and report the answer with the correct number of significant figures.)

Accepted Answer

70.0 kg

Question 11

Which of the following statements about significant figures is TRUE?

Accepted Answer

Zeros at the end of a decimal number are significant.

Question 12

A solution contains 18% (by mass) sodium chloride. How many grams of sodium chloride are present in 250 g of this solution?

Accepted Answer

45 g

Question 13

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

Accepted Answer

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

Question 14

A marble has a mass of 16.3 g and a volume of 4.82 mL. What is its density in $$\mathrm{g/mL}$$? (Use the correct number of significant figures.)

Accepted Answer

$$3.38\ \mathrm{g/mL}$$

Question 15

Which of the following is the largest unit?

Accepted Answer

kilogram

Question 16

A patient is prescribed 0.150 mg Synthroid. If each tablet contains 75 mcg Synthroid, how many tablets are needed? (1 mg = 1000 mcg)

Accepted Answer

2 tablets

Question 17

Which of the following is a measured number?

Accepted Answer

The length of a table measured as 1.52 m

Question 18

A sample of HDL (high-density lipoprotein) has a mass of 0.258 g and a volume of 0.215 mL. What is the density of the sample in $$\mathrm{g/mL}$$? (Use the correct number of significant figures.)

Accepted Answer

$$1.20\ \mathrm{g/mL}$$

Chemistry and Measurements: Study Notes for GOB College Students

Guida di studio - Domande di pratica

Study guide - Flashcard