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+, P3–

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

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. O2–

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)

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