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

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

Q: Convert $50\ \mathrm{L}$ to nanoliters (nL).

$5.0 \times 10^{10}\ \mathrm{nL}$

Question 1

A patient is prescribed 0.150 mg of a medication. If each tablet contains 75 $ \mu g $ of the drug, how many tablets are required to provide the prescribed dose?

Accepted Answer

2 tablets

Question 2

Which of the following numbers has exactly three significant figures?

Accepted Answer

501

Question 3

Convert 25 milliseconds (ms) to seconds (s).

Accepted Answer

$0.025\ \mathrm{s}$

Question 4

A sample of an unknown liquid has a mass of 214.7 g and a density of $1.32\ \mathrm{g/mL}$. What is the volume of the sample in mL, rounded to the correct number of significant figures?

Accepted Answer

$162.0\ \mathrm{mL}$

Question 5

Which of the following statements about significant figures is TRUE?

Accepted Answer

Zeros between nonzero digits are always significant.

Question 6

A person weighs 164 lb. What is their mass in kilograms? (Use $1\ \mathrm{kg} = 2.20\ \mathrm{lb}$ and round to the correct number of significant figures.)

Accepted Answer

$74.5\ \mathrm{kg}$

Question 7

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 8

What is the result of $\frac{5.00\ \mathrm{cm} 	imes 3.408\ \mathrm{cm}}{2.0\ \mathrm{cm}}$ with the correct number of significant figures?

Accepted Answer

$8.5$

Question 9

Which metric prefix represents $10^{-6}$?

Accepted Answer

micro

Question 10

A doctor orders 2.0 teaspoons (tsp) of cough syrup. If the syrup has a density of $1.20\ \mathrm{g/mL}$ and there are $5.0\ \mathrm{mL}$ in 1 tsp, what is the mass of the syrup in grams?

Accepted Answer

$12.0\ \mathrm{g}$

Question 11

Which of the following is the correct relationship between nanometers (nm) and millimeters (mm)?

Accepted Answer

$1\ \mathrm{nm} = 10^{-6}\ \mathrm{mm}$

Question 12

Convert $4.00\ \mathrm{lb}$ to grams. ($1\ \mathrm{kg} = 2.20\ \mathrm{lb}$, $1\ \mathrm{kg} = 1000\ \mathrm{g}$)

Accepted Answer

$1818\ \mathrm{g}$

Question 13

Which of the following is the correct equality for the cubic centimeter?

Accepted Answer

$1\ \mathrm{cm}^3 = 1\ \mathrm{mL}$

Question 14

A measurement is recorded as 0.000450 g. How many significant figures does this number have?

Accepted Answer

3

Question 15

Which of the following is the correct result for $(55.930 - 2.0045) + 7.81$ with the correct number of significant figures?

Accepted Answer

$61.74$

Question 16

Which of the following is NOT a feature of exact numbers?

Accepted Answer

They are used to find the number of significant figures in a calculated answer.

Question 17

Which of the following is the correct conversion factor for $1\ \mathrm{m} = 100\ \mathrm{cm}$?

Accepted Answer

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

Question 18

Which of the following is the correct formula for density?

Accepted Answer

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

Question 19

Convert $50\ \mathrm{L}$ to nanoliters (nL).

Accepted Answer

$5.0 	imes 10^{10}\ \mathrm{nL}$

Question 20

When multiplying or dividing measured numbers, the final answer should be rounded to:

Accepted Answer

The same number of significant figures as the measurement with the fewest significant figures.

Chapter 2: Chemistry and Measurements – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards