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 needed to provide the prescribed dose?

Accepted Answer

2 tablets

Question 2

Which of the following numbers has exactly three significant figures?

Accepted Answer

79300

Question 3

A nurse measures 2.0 teaspoons of cough syrup. If the syrup has a density of 1.20 $$ \frac{g}{mL} $$ and there are 5.0 mL in 1 teaspoon, what is the mass of the syrup in grams?

Accepted Answer

$$12\ g$$

Question 4

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 5

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

Accepted Answer

$$0.025\ s$$

Question 6

How many significant figures should the answer to $$5.00\ 	ext{cm} 	imes 3.408\ 	ext{cm} \div 2.0\ 	ext{cm}$$ have?

Accepted Answer

Two

Question 7

Which of the following statements about significant figures is TRUE?

Accepted Answer

Zeros between nonzero digits are always significant.

Question 8

A car travels at a speed of 85 km/h. How many meters does it travel in 1 hour?

Accepted Answer

$$8,500\ m$$

Question 9

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

Accepted Answer

micro

Question 10

Convert 50 L to nanoliters (nL).

Accepted Answer

$$5 	imes 10$$^{10}$$\ nL$$

Question 11

Which of the following equalities is defined as exact and does NOT affect significant figures in calculations?

Accepted Answer

$$1\ in. = 2.54\ cm$$

Question 12

A sample of an unknown liquid has a mass of 214.7 g and a density of $$1.32\ \frac{g}{mL}. $$What is its volume in mL?

Accepted Answer

$$162.7\ mL$$

Question 13

Which of the following is the correct relationship between cubic centimeters, milliliters, and cubic meters?

Accepted Answer

$$1\ cm^3$ = 1\ mL$$

Question 14

A person weighs 164 lb. What is their mass in kilograms? (Use $$1\ kg = 2.20\ lb)$$

Accepted Answer

$$74.5\ kg$$

Question 15

Which of the following is the correct conversion factor to convert from centimeters squared to meters squared?

Accepted Answer

$$\left( \frac{1\ m}{100\ cm} \$$right)^2$$

Question 16

When multiplying $$24.66\ cm 	imes 0.35\ cm$$, what is the answer rounded to the correct number of significant figures?

Accepted Answer

$$8.6\ cm^2$

Question 17

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

Accepted Answer

Have a limited number of significant figures

Question 18

A solution contains 18% body fat by mass. How is this percentage used as a conversion factor?

Accepted Answer

$$\frac{18\ kg\ body\ fat}{100\ kg\ body\ mass}$$

Question 19

Which of the following is the correct way to round 8.4234 to three significant figures?

Accepted Answer

$$8.42$$

Question 20

Which of the following is the correct equality for the metric prefix 'kilo'?

Accepted Answer

$$1\ km = 1 	imes 10^3$\ m$$

Chapter 2: Chemistry and Measurements – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard