CLEP chemistry exam questions with
complete solutions13
Which chemical equation represents this reaction:
a Bronsted-Lowry acid-base reaction
A.) 2 KCLO₂(s) → 2 KCLO(s) + 3 O₂(g)
B.) Zn(s) + Cu² + (aq) → Zn² + (aq) + Cu(s)
C.) CO³ + (aq) + 6 NH (aq) → [Co(NH³)₆³+](aq)
D.) H₂O+9aq) + NH₂(aq)→ H₂O(I) + NH₂+(aq) - ANSWERS-
The attractions between atoms within a molecule of NH3 are best characterized as
A. hydrogen bonds
B. ionic bonds
C. polar covalent bonds
D. London (dispersion) forces
E. ion-dipole forces - ANSWERS-polar covalent bonds
R(g) + 2T(g) ⇌ 2X(g) + Z(g)
The reaction mixture above is at equilibrium at 298 K. The value of the equilibrium constant for
the reaction is 16 at 298K. If R(g) , X(g) and Z(g) each have an equilibrium concentration of 2.0
M, what is the equilibrium concentration of T(g) ? - ANSWERS-0.50
, 7) what is the pH of a solution made by diluting 1.00 ml of 0.10 M HCL with enough distilled
water to make 1.00L of solution? - ANSWERS-4.0
1) The electron configuration notation for molybdenum is
A) 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d6
B) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 3f 6
C) 1s2 2s2 2p6 2d10 3s2 3p6 3d10 3f 4
D) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d4
E) 1s2 2s2 3s2 4s2 5s2 2p6 3p6 4p6 3d10 4d4 - ANSWERS-D:) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
5s2 4d4. The order of filling is 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p with s
sublevels holding a maximum of 2 electrons, p holding up to 6, d up to 10 and f up to 14.
2) The periodic property which decreases all the way across the table is
A) Ionization energy
B) Atomic radius
C) Ionic size
D) Shielding effect
E) Electron affinity - ANSWERS-B:) Atomic radius. The atomic radius decreases all the way across
the table since adding both protons and electrons going across giving a greater attraction of the
electrons by the protons, so pull the electrons in tighter to the nucleus.
3) The gram formula mass of (NH4)2SO4 is
A) 74 grams
B) 118 grams
C) 64 grams
complete solutions13
Which chemical equation represents this reaction:
a Bronsted-Lowry acid-base reaction
A.) 2 KCLO₂(s) → 2 KCLO(s) + 3 O₂(g)
B.) Zn(s) + Cu² + (aq) → Zn² + (aq) + Cu(s)
C.) CO³ + (aq) + 6 NH (aq) → [Co(NH³)₆³+](aq)
D.) H₂O+9aq) + NH₂(aq)→ H₂O(I) + NH₂+(aq) - ANSWERS-
The attractions between atoms within a molecule of NH3 are best characterized as
A. hydrogen bonds
B. ionic bonds
C. polar covalent bonds
D. London (dispersion) forces
E. ion-dipole forces - ANSWERS-polar covalent bonds
R(g) + 2T(g) ⇌ 2X(g) + Z(g)
The reaction mixture above is at equilibrium at 298 K. The value of the equilibrium constant for
the reaction is 16 at 298K. If R(g) , X(g) and Z(g) each have an equilibrium concentration of 2.0
M, what is the equilibrium concentration of T(g) ? - ANSWERS-0.50
, 7) what is the pH of a solution made by diluting 1.00 ml of 0.10 M HCL with enough distilled
water to make 1.00L of solution? - ANSWERS-4.0
1) The electron configuration notation for molybdenum is
A) 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d6
B) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 3f 6
C) 1s2 2s2 2p6 2d10 3s2 3p6 3d10 3f 4
D) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d4
E) 1s2 2s2 3s2 4s2 5s2 2p6 3p6 4p6 3d10 4d4 - ANSWERS-D:) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
5s2 4d4. The order of filling is 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p with s
sublevels holding a maximum of 2 electrons, p holding up to 6, d up to 10 and f up to 14.
2) The periodic property which decreases all the way across the table is
A) Ionization energy
B) Atomic radius
C) Ionic size
D) Shielding effect
E) Electron affinity - ANSWERS-B:) Atomic radius. The atomic radius decreases all the way across
the table since adding both protons and electrons going across giving a greater attraction of the
electrons by the protons, so pull the electrons in tighter to the nucleus.
3) The gram formula mass of (NH4)2SO4 is
A) 74 grams
B) 118 grams
C) 64 grams
