Q: A graduated cylinder contains 946 mL of liquid. How many quarts does this represent?

$$946 \div 946 = 1\ \text{qt}$$

Q: A sample of metal weighs 48.0 g and displaces water from 25.0 mL to 33.0 mL in a graduated cylinder. What is the density of the metal?

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

Q: A doctor prescribes 0.150 mg of medication. Tablets contain 75 mcg each. How many tablets are needed?

$$\frac{0.150\ \text{mg} \times 1000\ \text{mcg/mg}}{75\ \text{mcg/tablet}} = 2\ \text{tablets}$$

Q: A solution contains 1.9% omega-3 fatty acids by mass. How many grams of omega-3 are in 100 g of solution?

$$100 \times 0.019 = 1.9\ \text{g}$$

Q: If a person walks 2.1 kilometers, how many meters have they walked?

$$2.1 \times 1000 = 2100\ \text{m}$$

Q: Which of the following is the correct conversion factor for converting liters to milliliters?

$$1\ \text{L} = 1000\ \text{mL}$$

Q: A liquid has a density of 1.32 g/mL. What is the volume of 14.7 g of this liquid?

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

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

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

Q: A nurse needs to convert 1.4 days to minutes. What is the correct calculation?

$$1.4 \times 24 \times 60 = 2016\ \text{min}$$

Question 1

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

Accepted Answer

kilogram (kg)

Question 2

A nurse records a patient's temperature as 37°C. What is this temperature in Kelvin?

Accepted Answer

$$37 + 273.15 = 310.15\ K$$

Question 3

Which of the following numbers has three significant figures?

Accepted Answer

0.00450

Question 4

A graduated cylinder contains 946 mL of liquid. How many quarts does this represent?

Accepted Answer

$$946 \div 946 = 1\ 	ext{qt}$$

Question 5

Which of the following is an exact number?

Accepted Answer

1 kg = 1000 g

Question 6

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

Accepted Answer

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

Question 7

Which prefix represents a factor of $$10^{-3}$$?

Accepted Answer

milli-

Question 8

A doctor prescribes 0.150 mg of medication. Tablets contain 75 mcg each. How many tablets are needed?

Accepted Answer

$$\frac{0.150\ 	ext{mg} 	imes 1000\ 	ext{mcg/mg}}{75\ 	ext{mcg/tablet}} = 2\ 	ext{tablets}$$

Question 9

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros at the end of a decimal number are significant.

Question 10

A solution contains 1.9% omega-3 fatty acids by mass. How many grams of omega-3 are in 100 g of solution?

Accepted Answer

$$100 	imes 0.019 = 1.9\ 	ext{g}$$

Question 11

If a person walks 2.1 kilometers, how many meters have they walked?

Accepted Answer

$$2.1 	imes 1000 = 2100\ 	ext{m}$$

Question 12

Which of the following is the correct conversion factor for converting liters to milliliters?

Accepted Answer

$$1\ 	ext{L} = 1000\ 	ext{mL}$$

Question 13

A liquid has a density of 1.32 g/mL. What is the volume of 14.7 g of this liquid?

Accepted Answer

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

Question 14

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

Accepted Answer

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

Question 15

A nurse needs to convert 1.4 days to minutes. What is the correct calculation?

Accepted Answer

$$1.4 	imes 24 	imes 60 = 2016\ 	ext{min}$$

Question 16

Which of the following is the correct definition of density?

Accepted Answer

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

Question 17

Which of the following statements about the metric system is true?

Accepted Answer

The metric system uses prefixes to indicate multiples or fractions of units.

Question 18

A solution has a specific gravity of 1.20. What does this mean?

Accepted Answer

The solution is 1.20 times as dense as water.

Chemistry and Measurements: Units, Significant Figures, and Calculations

Guida di studio - Domande di pratica

Study guide - Flashcard