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

Guida di studio - Domande di pratica

Study guide - Flashcard