Chemistry I

Some review

It’s departmental!

PQ1

What term best describes the relation of hydrogen (¹H) to deuterium (²H)?

1. allotropes
2. isomers
3. isotopes
4. polymers

C

PQ2

How many neutrons are in carbon–14?

1. 6
2. 7
3. 8
4. 20

C

PQ3

What pair of particles has the same number of electrons?

1. F^–, Mg²⁺
2. Ne, Ar
3. Br^–, Se
4. Al³⁺, P^3–

A

PQ4

Which group contains nonmetals, metalloids, and metals?

1. 1
2. 13
3. 15
4. 18

C

PQ5

What group contains halogens?

1. 1
2. 15
3. 17
4. 18

C

PQ6

What is the wavelength (in nm) of a photon with an energy of 6.51×10^–19 J?

1. 3.05×10^–9
2. 305
3. 1.00×10¹⁵
4. 4.52×10²⁶

B

\(E = \dfrac{hc}{\lambda}\)

PQ7

Which ground state electron configuration is possible for an atom in the second period?

1. 1s²2s¹2p¹
2. 1s²2s²2d¹
3. 1s²2s¹
4. 1s²2p⁴

C

PQ8

Which of these species is/are paramagnetic?

1. Fe²⁺ only
2. Zn only
3. Ti⁴⁺ and Fe²⁺ only
4. Fe²⁺ and Zn only

A

Electron configurations

PQ9

The size of metal atoms

1. generally increases progressively from top to bottom in a group in the periodic table
2. generally increases progressively from left to right in a period
3. are smaller than those of the corresponding atoms
4. do not change upon losing electrons

A

PQ10

Which of these elements has the smallest atomic radius?

1. fluorine
2. chlorine
3. bromine
4. iodine

A

PQ11

Which ion is the smallest?

1. Al³⁺
2. Na⁺
3. F^–
4. O^2–

A

PQ12

Which ion has the largest radius?

1. Cl^–
2. F^–
3. K⁺
4. Ga³⁺

Note: For those that were present in the 9AM class, I’ve changed this question since ionic radii of transition metals is not mentioned in your textbook.

A

PQ13

Which sample has the largest mass?

1. 1 mole of marshmallows
2. 1 mole of Pb (lead) atoms
3. 1 mole of CO₂ (carbon dioxide) molecules
4. All of these have the same mass

A

PQ14

A 10 gram sample of which substance contains the greatest number of hydrogen atoms?

1. CH₄
2. HCl
3. H₂
4. PH₃

C

PQ15

A 3.41×10^–6 g sample is known to contain 4.67×10¹⁶ molecules. What is this compound?

1. CH₄
2. CO₂
3. H₂O
4. NH₃

B

PQ16

What is the mass (in g) of 1.75 moles of Zn?

1. 0.0268
2. 37.4
3. 65.4
4. 114

D

PQ17

What is the mass (in g) of 1.75 moles of Zn?

1. 0.0268
2. 37.4
3. 65.4
4. 114

D

PQ18

What mass (in g) of oxygen does 25.5 g of aluminum carbonate, Al₂(CO₃)₃, contain? (Molar mass of Al₂(CO₃)₃ = 233.99 g mol^–1)

1. 1.59
2. 1.74
3. 5.23
4. 15.7

D

PQ19

Which compound contains the largest percent by mass of oxygen?

1. CO₂
2. NO₂
3. SO₂
4. SiO₂

A

PQ20

The limiting reagent for a given reaction can be recognized because it is the reagent that

1. has the smallest coefficient in the balanced equation for the reaction
2. has the smallest mass in the reaction mixture
3. is present in the smallest molar quantity
4. would be used up first

D

PQ21

How many moles of water are necessary to react completely with 8.0 mol PCl₅?

\[\mathrm{PCl_5} + 4~\mathrm{H_2O} \longrightarrow \mathrm{H_3PO_4} + 5~\mathrm{HCl}\]

1. 2.0
2. 8.0
3. 16
4. 32

D

PQ22

If 365.5 g H₂O(l) is combined with excess KO₂, what mass of O₂(g) (in g), is expected to be produced?

\[2~\mathrm{KO_2(s)} + 2~\mathrm{H_2O} \longrightarrow 2~\mathrm{KOH(s)} + \mathrm{O_2(g)} + \mathrm{H_2O_2(l)}\]

1. 11.42
2. 162.4
3. 324.7
4. 659.4

C

PQ23

What mass (in g) of FeS is necessary to form 1.08 g Fe₂O₃ with excess O₂?

\[4~\mathrm{FeS} + 7~\mathrm{O_2} \longrightarrow 2~\mathrm{Fe_2O_3} + 4~\mathrm{SO_2}\] (Molar mass FeS = 87.92 g mol^–1; Molar mass Fe₂O₃ = 159.7 g mol^–1)

1. 0.0136
2. 0.298
3. 1.19
4. 2.16

C

PQ24

A mixture of 9 mol F₂ and 4 mol S are allowed to react. \[3~\mathrm{F_2} + \mathrm{S} \longrightarrow \mathrm{SF_6}\] How many moles of F₂ remain after 3 mol of S have reacted?

1. 3
2. 2
3. 1
4. 0

D

PQ25

What is the molar concentration of a solution when 7.00 mL of a 3.25 M aqueous solution is diluted to 25.00 mL?

1. 0.280
2. 0.910
3. 1.10
4. 2.15

B

PQ26

What is a weak acid in water?

1. HBr
2. HCl
3. HF
4. HI

C

PQ27

What is the oxidation number of chlorine in NaClO₂?

1. –1
2. +1
3. +3
4. +5

C

PQ28

What is the oxidation number of chromium in Na₂Cr₂O₇?

1. +12
2. +6
3. +3
4. –2

B

PQ29

Which combination will result in a precipitate forming?

1. NaOH(aq) and HCl(aq)
2. NaOH(aq) and FeCl₃(aq)
3. NaNO₃(aq) and FeCl₃(aq)
4. Zn(s) and HCl(aq)

B

Solubility rules

PQ30

What volume (in mL) of a 0.0557 M Sr(OH)₂ solution is needed to neutralize 36.4 mL of a 0.0750 M HNO₃ solution?

1. 24.5
2. 36.4
3. 49.0
4. 98.0

A