Q: Which equality is defined as exact and therefore does NOT limit significant figures in calculations?

$$1 \ \text{in} = 2.54 \ \text{cm}$$

Q: Which of the following is the correct equality for volume?

$$1.0 \ \text{mL} = 1.0 \ \text{cm}^3 = 1.0 \ \text{cc}$$

Q: Which of the following is NOT a correct conversion factor?

$$1 \ \text{mg} = 0.01 \ \text{g}$$

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

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

Q: A solution contains 18% NaCl by mass. How would you write this as a conversion factor?

$$\frac{18 \ \text{g NaCl}}{100 \ \text{g solution}}$$

Question 1

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 2

A patient’s urine sample has a specific gravity of 1.028. What does this value indicate?

Accepted Answer

The urine is more dense than water

Question 3

Which of the following numbers has three significant figures?

Accepted Answer

0.00476

Question 4

A doctor prescribes 0.150 mg of a medication. If the tablets available are 50.0 mcg each, how many tablets should be given?

Accepted Answer

3.0 tablets

Question 5

Which equality is defined as exact and therefore does NOT limit significant figures in calculations?

Accepted Answer

$$1 \ 	ext{in} = 2.54 \ 	ext{cm}$$

Question 6

A metal sample has a mass of 48.0 g and raises the water level in a graduated cylinder from 25.0 mL to 33.0 mL. What is the density of the metal?

Accepted Answer

$$6.0 \ 	ext{g/mL}$$

Question 7

Which of the following is the correct metric prefix and its value?

Accepted Answer

centi-, $$10^{-2}$$

Question 8

A nurse needs to convert a patient’s weight from pounds to kilograms. If the patient weighs 178 lb, what is the mass in kilograms? (Use $$2.20 \ 	ext{lb} = 1 \ 	ext{kg})$$

Accepted Answer

$$80.9 \ 	ext{kg}$$

Question 9

Which of the following numbers is correctly written in scientific notation with the correct number of significant figures: 0.002650 meters?

Accepted Answer

$$2.650 	imes 10$$^{-3}$$

Question 10

A sample of cough syrup has a density of $$1.20 \ 	ext{g/mL}. If a $$patient takes $$2.0$$ teaspoons and $$1$$ teaspoon is $$5.0 mL$$, what is the mass of the syrup taken?

Accepted Answer

$$12 \ 	ext{g}$$

Question 11

Which of the following statements about significant figures is TRUE?

Accepted Answer

Trailing zeros after a decimal point are significant.

Question 12

How many minutes are in 1.6 days?

Accepted Answer

$$2300 \ 	ext{min}$$

Question 13

A liquid has a density of $$1.32 \ 	ext{g/mL}. $$What is the volume in mL of a $$14.7 g $$sample?

Accepted Answer

$$11.1 \ 	ext{mL}$$

Question 14

Which of the following is the correct equality for volume?

Accepted Answer

$$1.0 \ 	ext{mL} = 1.0 \ 	ext{cm}^3 = 1.0 \ 	ext{cc}$$

Question 15

A patient walks on a treadmill at $$65 \ 	ext{m/min}. $$How many minutes will it take to walk $$7.5 \ 	ext{km}$$?

Accepted Answer

$$120 \ 	ext{min}$$

Question 16

Which of the following is NOT a correct conversion factor?

Accepted Answer

$$1 \ 	ext{mg} = 0.01 \ 	ext{g}$$

Question 17

A bone density scan shows a patient’s bone blocks fewer X-rays than normal. What does this most likely indicate?

Accepted Answer

The patient has osteoporosis

Question 18

Which of the following is the correct formula for density?

Accepted Answer

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

Question 19

A solution contains 18% NaCl by mass. How would you write this as a conversion factor?

Accepted Answer

$$\frac{18 \ 	ext{g NaCl}}{100 \ 	ext{g solution}}$$

Chemistry and Measurements: Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard