Question 1

Which of the following is the correct SI unit for measuring the amount of a substance?

Accepted Answer

mole (mol)

Question 2

A student measures the mass of a metal sample as 156 g and its volume as 20.0 cm$$^3. $$What is the density of the metal in g/cm$$^3$$?

Accepted Answer

$$7.80$$

Question 3

Which of the following numbers has exactly three significant figures?

Accepted Answer

$$100.$$

Question 4

Convert $$36.0$$ inches to centimeters. (Given: $$1 in$$ $$= 2.54 cm)$$

Accepted Answer

$$91.4 cm$$

Question 5

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

Accepted Answer

micro

Question 6

A graduated cylinder contains $$25.0 mL of $$water. After adding a metal pellet, the water rises to $$33.3 mL. If $$the pellet's mass is $$16.00 g$$, what is its density in g/mL?

Accepted Answer

$$1.93$$

Question 7

Which of the following statements about density is FALSE?

Accepted Answer

Density depends on the amount of substance present.

Question 8

What is the volume, in liters, of a $$305 in$^3$$ engine? (Given: $$1 in$$ $$= 2.54 cm$$, $$1 L$$ $$= 1000 cm$^3)$$

Accepted Answer

$$4.99 L$$

Question 9

A person gains $$10.0$$ lbs of pure fat. If the density of human fat is $$0.918 g/cm$^3$$ and $$1 kg$$ $$= 2.2$$ lbs, what is the volume gained in cm$$^3$$?

Accepted Answer

$$4,960$$ 	ext{ cm}^3$

Question 10

Which of the following is an exact number with infinite significant figures?

Accepted Answer

$$1 m$$ $$= 1000 mm$$

Question 11

A rectangular block is $$1.827 m $$long, $$1.04 m $$wide, and $$0.064 m $$thick. What is its volume in m$$^3 ($$rounded to the correct number of significant figures)?

Accepted Answer

$$0.122$$ 	ext{ m}^3$

Question 12

Which temperature conversion is correct?

Accepted Answer

$$0^\circ C = (0^\circ F - 32)/1.8$$

Question 13

How many significant figures are in the measurement $$0.003050 km$$?

Accepted Answer

4

Question 14

A $$15$$ gallon plastic bottle is filled with water ($$1$$ gal $$= 3.785 L$$, $$d_{water} = 1.00 g/mL). $$What is the mass of the water in kilograms?

Accepted Answer

$$56.8$$ 	ext{ kg}

Question 15

Which of the following is the correct metric conversion for $$88 cm to $$meters?

Accepted Answer

$$0.088$$ 	ext{ m}

Question 16

A $$3.0 L $$flask is filled with mercury ($$d = 13.6 g/cm$^3). $$What is the mass of mercury in the flask in kilograms?

Accepted Answer

$$40.8$$ 	ext{ kg}

Question 17

Which of the following is the correct way to express $$325 mg in $$grams?

Accepted Answer

$$0.325$$ 	ext{ g}

Question 18

A child weighing $$18$$ lbs needs a dose of $$10 mg/kg of $$ibuprofen. The suspension contains $$100 mg/5.0 mL. $$How many mL should be given? ($$1 kg$$ $$= 2.2$$ lbs)

Accepted Answer

$$4.1$$ 	ext{ mL}

Question 19

Which of the following is NOT a rule for determining significant figures?

Accepted Answer

All zeros are always significant.

Measurements, Units, and Problem Solving in General Chemistry

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