Question 1

A nurse needs to convert a 2.5 kg sample of a nutritional supplement to grams for accurate measurement. How many grams should the nurse measure out?

$$1 	ext{ kg} = 1000 	ext{ g}$$

Accepted Answer

2500 g

Question 2

A lab technician is preparing a vaccine that must be stored at 279.90 K. What is this temperature in degrees Celsius ($$^\circC$$)?

$$T_{^\circ C} = T_K - 273.15$$

Accepted Answer

6.75 $$^\circC$$

Question 3

A scientist finds that 5.00 mL of blood has a mass of 5.30 g. What is the density of the blood sample?

$$d = \frac{m}{V}$$

Accepted Answer

1.06 g/mL

Question 4

Calculate the volume, in mL, of a liquid that has a density of 5.20 g/mL and a mass of 1.55 g.

$$v = \frac{m}{d}$$

Accepted Answer

0.298 mL

Question 5

The density of a typical human red blood cell is approximately 1.125 g/mL. If the volume of a single red blood cell is $$9.0 	imes 10$$^{-11}$$ mL, what is its approximate mass in grams?

$$	ext{mass} = d 	imes v$$

Accepted Answer

$$1.0 	imes 10$$^{-10}$$ g

Question 6

Which of the following best describes the arrangement of particles, shape, and volume of a solid?

Accepted Answer

Particles are very close together and have a definite shape and definite volume.

Question 7

Match the following physical changes with the correct term: solid $$\rightarrow$$ gas.

Accepted Answer

Sublimation

Question 8

A medication contains 42 mg of propranolol in 1 tablet. How many grams of propranolol are in 3 tablets?

$$1 	ext{ g} = 1000 	ext{ mg}$$

Accepted Answer

0.126 g

Question 9

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 10

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Air

Question 11

A sample of bone has a mass of 2.15 g and a volume of 1.40 cm$$^3. $$What is its density in g/cm$$^3$$?

$$d = \frac{m}{V}$$

Accepted Answer

1.54 g/cm$$^3$$

Question 12

Which of the following is a physical change?

Accepted Answer

Water boiling

Question 13

Which of the following is a pure substance?

Accepted Answer

Water

Question 14

A student needs to convert 314 K to degrees Celsius. What is the correct temperature in $$^\circC$$?

$$T_{^\circ C} = T_K - 273.15$$

Accepted Answer

41 $$^\circC$$

Question 15

Which of the following best describes a heterogeneous mixture?

Accepted Answer

Composition varies from one part to another

Question 16

Which process describes a gas turning directly into a solid?

Accepted Answer

Deposition

Question 17

A sample of liquid has a mass of 10.0 g and a density of 2.0 g/mL. What is its volume?

$$v = \frac{m}{d}$$

Accepted Answer

5.0 mL

Question 18

Which of the following is NOT a physical property?

Accepted Answer

Toxicity

Question 19

Which of the following is an example of a compound?

Accepted Answer

Water (H$$_2O)$$

Chemistry and Measurement: Classification of Matter, Unit Conversion, and Density

Guida di studio - Domande di pratica

Study guide - Flashcard