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Chemistry CLEP Practice Test
1) The electron configuration notation for molybdenum is
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
3) The gram formula mass of (NH4)2SO4 is
A) 74 grams
B) 118 grams
C) 64 grams
D) 114 grams
E) 132 grams
4) In a balanced equation, the relative numbers of moles of the reactants used and products formed are given by
A) Subscripts within parentheses
B) Coefficients of the formulas
C) Subscripts outside the parentheses
D) Superscripts of the formulas
E) A multiplication of coefficients by subscripts
5) Barium carbonate, when heated, yields
A) Barium carbide and water
B) Barium and carbon trioxide
C) Barium carbide and oxygen
D) Barium and carbon dioxide
E) Barium oxide and carbon dioxide
6) An activated complex
A) Is a transitional state
B) Occurs in all reactions
C) Is the result of new bonds
D) Results in activation energy
E) Is all about broken bonds
7) The oxidation number of H in Ba(OH)2 is
8) An acid with a molarity of 6.0 M is a
A) Strong acid
B) Concentrated acid
C) Weak acid
D) Dilute acid
E) Neutral solution
9) In the case of liquids dissolved in liquids, little change in temperature is expected because
A) Only a small amount of solute can dissolve
B) All liquids are completely miscible
C) No change in physical state occurs
D) Hydration prevents chemical activity
E) Liquids don’t dissolve
10) A student did a titration of 50.0 mL of CH3COOH using 39.6 mL of 0.0950 N KOH. What was the normality of the CH3COOH?
A) 7.52 N
B) 0.75 N
C) 7.52 x 10-2 N
D) 0.119 N
E) 1.20 N
CLEP Practice Test Answer Key:
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.
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.
B:) Coefficients of the formulas. Subscripts balance formulas; coefficients balance equations.
E:) Barium oxide and carbon dioxide. Decomposition of a carbonate: Ba(CO3) ® BaO + CO2
A:) Is a transitional state. An activated complex is called the transition state. It is a group of atoms on the way to becoming an ionic or molecular product. An activated complex is the arrangement of atoms at the peak of the activation energy barrier.
A:) +1. Hydrogen is always +1 except in a metal hydride such as NaH when it is -1.
D:) Dilute acid. If it is 6.0 mol/L, that means its pH is 1 x 10-6, so it is near neutral which is dilute.
C:) No change in physical state occurs. No heat is given off or required to make a phase change.
C:) 7.52 x 10-2 N. V1N1 = V2N2 (50.0 mL CH3COOH)( N1) = (39.6 mL KOH)( 0.0950 N KOH)