Deck 3: Composition of Substances and Solutions

Question 1

An experiment requires 15.0 mL of a 0.100 M solution of HCl. If you have a 12.0 M HCl stock solution in the laboratory, how would you prepare enough 0.1 M solution to run at least 3 experiments? Outcome # 5) DOK 3)

A) add 0.833 mL 12 M HCl stock solution to 99.167 mL water
B) add 0.833 mL 12 M HCl stock solution to 49.167 mL water
C) add 0.833 mL 12 M HCl stock solution to 199.167 mL water

Answer 1

add 0.833 mL 12 M HCl stock solution to 99.167 mL water

Question 2

What is the molar mass of NH₄)₃PO₄? Outcome # 1,2) DOK 2

A) 113 g
B) 121 g
C) 149 g

Answer 2

149 g

Question 3

What is the molar mass of potassium nitrate? Outcome # 2) DOK 2)

A) 85.10 g/mol
B) 140.20 g/mol
C) 101.10 g/mol

Answer 3

101.10 g/mol

Question 4

What is the mass in grams of 6.022 x 10²³ molecules of CO₂? Outcome # 1,2) DOK 3

A) 22 g
B) 44 g
C) 66 g

Question 5

What is the mass in grams of 1.59 moles of aluminum oxide? Outcome # 2) DOK 2)

A) 162 g
B) 0.0156 g
C) 64.1 g

Question 6

What is the molar mass of K₂CO₃? Outcome # 1,2) DOK 2

A) 138 g/mol
B) 106 g/mol
C) 99 g/mol

Question 7

A 44.8 g rhodium sample contains how many rhodium atoms? Outcome # 2) DOK 3)

A) 2.62 x 10²³ atoms
B) 6.02 x 10²³ atoms
C) 2.70 x 10²⁵ atoms

Question 8

To dilute a HCl solution from 0.500 M to 0.100 M the final volume must be: Outcome # 1,2,4,5,8) DOK 2

A) 1/5 the original volume
B) 5 times the original volume
C) 50 L

Question 9

What is the mass in grams of 0.852 moles of ferric oxide? Outcome # 2) DOK 3) Paired item 1)

A) 5.34 x 10^-3 g
B) 187 g
C) 136 g

Question 10

How many grams are in 1.02 x 10²² molecules of nitric acid? Outcome # 2) DOK 3) Paired item 1)

A) 1.07 g
B) 3720 g
C) 2.69 x 10^-4 g

Question 11

What is the total number of atoms contained in 2.11 moles of nickel? Outcome # 2) DOK 2)

A) 2.85 x 10²³ atoms
B) 1.27 x 10²⁴ atoms
C) 3.50 x 10^-24 atoms

Question 12

How many grams are in 2.05 x 10²³ molecules of dinitrogen pentoxide? Outcome # 2) DOK 3)

A) 317 g
B) 36.8 g
C) 0.00315 g

Question 13

Which of the following compounds contains the largest number of atoms? Outcome # 1,2) DOK 2

A) 1.00 mole of NH₃
B) 1.00 mole of H₂SO₄
C) 1.00 mole of HBr

Question 14

What is the total number of atoms contained in 1.00 mole of sodium? Outcome # 1,2,9) DOK 2

A) 118
B) 6.02 x 10²³
C) 1.2 x 10²⁴

Question 15

If a hazardous bottle is labeled 20.2 percent by mass Hydrochloric Acid, HCl, with a density of 1.096 g/mL, calculate the molarity of the HCl solution. Outcome # 1,2,5,8,9,10) DOK 3)

A) 6.07 M
B) 0.22 M
C) 14.7 M

Question 16

How would you prepare a 1 M solution of sodium hydroxide? Outcome # 5) DOK 3)

A) add 40.0 grams of sodium hydroxide to 1 L of water
B) add 40.0 grams of sodium hydroxide to 100 L of water
C) add 40.0 grams of sodium hydroxide to 10 L of water

Question 17

How many atoms are in 1.00 mole of Au? Outcome # 2) DOK 2) Paired item 1)

A) 6.02 x 10²³ atoms
B) 1.66 x 10^-24 atoms
C) 197 atoms

Question 18

How many moles are in 1.77 kg of cuprous sulfate? Outcome # 2) DOK 3)

A) 7.93 x 10^-3 moles
B) 7.93 moles
C) 395 moles

Question 19

What is the total number of atoms contained in 2.00 moles of iron? Outcome # 1,2) DOK 2

A) 118
B) 6.02 x 10²³
C) 1.2 x 10²⁴

Question 20

How would you prepare a 0.5 M solution of sodium hydroxide? Outcome # 5) DOK 3) Paired item 1)

A) add 40.0 grams of sodium hydroxide to 1 L of water
B) add 20.0 grams of sodium hydroxide to 1 L of water
C) add 20.0 grams of sodium hydroxide to 10 L of water

Question 21

An unknown organic compound 0.315 g) containing only C, H, and O produces 0.771 of CO₂ and 0.105 g of H₂O when it undergoes complete combustion. The approximate molar mass is 108 g/mol. Which of the following compounds could be the identification of the unknown? Outcome # 7) DOK 3)

A) para-Cresol, CH₃C₆H₄OH)
B) Benzyl alcohol, C₆H₅CH₂OH
C) 1,2-Benzoquinone, C₆H₄O₂

Question 22

A sample has a molar mass of 143 g/mol, identify the sample. Outcome # 2) DOK 1)

A) AuCl
B) AcCl
C) AgCl

Question 23

How is a solid phase represented in a chemical reaction? Outcome # 6) DOK 1)

A) s)
B) g)
C) l)

Question 24

A 5.91 g unknown sample analyzed by elemental analysis revealed a composition of 37.51 %

A) C₆H₈O₇
B) C₅H₆O₃
C) C₈H₁₆O₅
D) In addition, it was determined that the sample contains 1.4830 x 10²³ hydrogen atoms and 1.2966 x 10²³ oxygen atoms. What is the empirical formula? Outcome # 7) DOK 3)

Question 25

An unknown hydrocarbon compound was analyzed for hydrogen by elemental analysis and results show that it contains 15.88 % H. What is the empirical formula? Outcome # 7) DOK 2)

A) C₄H₉
B) C₈H₁₈
C) C₁₂H₂₇

Question 26

When a salt is dissolved in water, it is represented by the following notation in a chemical reaction? Outcome # 6) DOK 1)

A) aq)*
B) l)
C) s)

Question 27

How is a gas phase represented in a chemical reaction? Outcome # 6) DOK 1)

A) s)
B) g)
C) l)

Question 28

Commercial grade fuming nitric acid contains about 90% HNO₃ by mass with a density of 1.50 g/mL, calculate the molarity of the HNO₃ solution. Outcome # 9) DOK 3)

A) 0.214 M
B) 21.4 M
C) 2.14 M

Question 29

What is the concentration in ppm of a 3.7 L solution d = 1.00 g/mL) containing 4.21 x 10^-7 kg of the pesticide DDT? Outcome # 8) DOK 2)

A) 1.14 x 10^-1 ppm
B) 1.14 x 10² ppm
C) 1.14 x 10¹ ppm

Question 30

Which of the following is an experimental technique used to determine the mass percent of elements found in a compound? Outcome # 7) DOK 1)

A) gravimetric analysis
B) mass analysis
C) elemental analysis

Question 31

How many atoms are in 12.8 g of copper metal? Outcome # 6) DOK 2)

A) 7.71 x 10²⁴ atoms
B) 1.21 x 10²³ atoms
C) 3.34 x 10^-25 atoms

Question 32

How many grams of Hydrogen are present in three moles of Hydrogen? Outcome # 1,5,9) DOK 1)

A) two grams
B) six grams
C) one gram

Question 33

Which of the following is a method used to allow scientists to determine an empirical formula and identify an organic compound by combusting a sample and the resulting combustion products are quantitatively analyzed? Outcome # 7) DOK 1)

A) gravimetric analysis
B) combustion analysis
C) thermal analysis

Question 34

How is a liquid phase represented in a chemical reaction? Outcome # 6) DOK 1)

A) s)
B) g)
C) l)

Question 35

Which of the following compounds contains the largest number of atoms? Outcome # 1,9) DOK 2)

A) 1.00 mole of NH₃
B) 1.00 mole of H₂SO₄
C) 1.00 mole of HBr

Question 36

What are the proper units for molar mass in chemistry? Outcome # 6) DOK 1)

A) amu
B) g/mol
C) g/mmol

Question 37

How many atoms can be found in a mole of mercury? Outcome # 2) DOK 2)

A) 201 atoms
B) 6.02 x 10²³ atoms
C) 1.21 x 10²⁶ atoms

Question 38

A 3.00 g sample of unknown hydrocarbon is prepared for combustion analysis. After the hydrocarbon undergoes complete combustion, 8.80 g of CO₂ and 5.40 g of H₂O are produced. What is the empirical formula of the unknown? Outcome # 7) DOK 3)

A) CH₃
B) CH
C) CH₂

Question 39

A 0.125 g sample of unknown hydrocarbon is prepared for combustion analysis. After the hydrocarbon undergoes complete combustion, 0.4225 g of CO₂ and 0.0865 g of H₂O are produced. What is the empirical formula of the unknown? Outcome # 7) DOK 3) Paired item 1)

A) CH₃
B) CH
C) CH₂

Question 40

A 21.8 g sample of water contains how many water molecules? Outcome # 2) DOK 3)

A) 7.29 x 10²³ molecules
B) 6.02 x 10²³ molecules
C) 2.01 x 10^-24 molecules

Question 41

How many moles contain 6.022 x 10²³ lithium atoms? Outcome # 6) DOK 1)

A) 6.022 x 10²³ moles
B) 1 mole
C) 2 moles

Question 42

How many atoms are in 1 mole of calcium? Outcome # 6) DOK 1)

A) 6.022 x 10²³ atoms
B) 6.022 x 10^-23 atoms
C) 6.022 x 10²² atoms

Question 43

Which of the following 49.5 g samples contain the fewest number of atoms? Outcome # 6) DOK 3) Paired item 1)

A) lead
B) platinum
C) iron

Question 44

Which of the following 85.0 g samples contain the greatest number of atoms? Outcome # 6) DOK 3)

A) zinc
B) gold
C) zirconium

Question 45

How many grams contain 1.45 x 10²¹ zinc atoms? Outcome # 6) DOK 2)

A) 1.57 x 10^-1 g
B) 5.71 x 10⁴⁶ g
C) 2.41 x 10^-3 g

Question 46

What is Avogadro's number? Outcome # 6) DOK 1)

A) 6.022 x 10²³ particles/mole
B) 6.022 x 10²² particles/mole
C) 6.022 x 10²⁴ particles/mole

Question 47

How many moles are in 11.0 g of silver metal? Outcome # 6) DOK 1)

A) 9.81 moles
B) 1.19 x 10³ moles
C) 1.02 x 10^-1 moles