General: Stoichioimetry / Reactions
Atomic / Structure
Nuclear
Bonding
/ Shapes
Gas LAws
100
___C10H12O4S(s) + ____O2(g) ---> ___ CO2(g) + ___ SO2(g) + ___ H2O(g) When the equation above is balanced and all coefficients are reduced to their lowest whole-number terms, the coefficient for O2(g) is?
What is 12
100
1s2 2s22p6 3s23p3 Atoms of an element, X, have the electronic configuration shown above. The compound most likely formed with magnesium, Mg, is
What is Mg3X2
100
The radioactive decay of 6-C-14 to 7-N-14 occurs by the process of (A) beta particle emission (B) alpha particle emission (C) positron emission (D) electron capture (E) neutron capture
What is A
100
Pi bonding occurs in each of the following species EXCEPT (A) CO2 (B) C2H4 (C) CN¯ (D) C6H6 (E) CH4
What is E
100
The density of an unknown gas is 4.20 grams per liter at 3.00 atmospheres pressure and 127 °C. What is the molecular weight of this gas? (R = 0.0821 liter-atm / mole-K)
What is 46.0 g
200
In which of the following compounds is the mass ratio of chromium to oxygen closest to 1.6 to 1.0? (A) CrO3 (B) CrO2 (C) CrO (D) Cr20 (E) Cr2O3
What is B
200
What is the ground state electron configuration for the Mn3+ ion? (Atomic number Mn = 25)
What is 1s2 2s22p6 3s23p63d4
200
98-Cf-251 ---> 2n + 54-Xe-131 + __ What is the missing product in the nuclear reaction represented above? (A) 42-Mo-118 (B) 44-Ru-118 (C) 42-Mo-120 (D) 44-Ru-120 (E) 46-Pd-122
What is D
200
The Lewis dot structure of which of the following molecules shows only one unshared pair of valence electron? (A) Cl2 (B) N2 (C) NH3 (D) CCl4 (E) H2O2
What is C
200
A sample of 3.0 grams of an ideal gas at 121 °C and 1.0 atmosphere pressure has a volume of 1.0 Iiters. Which of the following expressions is correct for the molar mass of the gas? The ideal gas constant, R, is 0.08 (L-atm)/ (mole K). (A) [(0.08)(400)] / [(3.0)(1.0)(1.5)] (B) [(l.O)(l.5)] / [(3.0)(0.08)(400)] (C) [(O.O8)(1.0)(1.5)] / [(3.0)(400)] (D) [(3.0)(0.08)(400)] / [(1.0)(1.5)] (E) [(3.0)(0.08)(1.5)] / (1.0)(400)]
What is D
300
When hafnium metal is heated in an atmosphere of chlorine gas, the product of the reaction is found to contain 62.2 percent Hf by mass and 37.4 percent Cl by mass. What is the empirical formula for this compound?
What is HfCl3
300
Which of the elements above has the smallest ionic radius for its most commonly found ion? (A) O (B) La (C) Rb (D) Mg (E) N
What is D
300
When 84-Po-214 decays, the emission consists consecutively of an alpha particle, then two beta particles, and finally another alpha particle. The resulting stable nucleus is
What is 82-Pb-206
300
The SbCl5 molecule has trigonal bipyramid structure. Therefore, the hybridization of Sb orbitals should be
What is sp3d
300
Which of the following Gas deviates most from ideal behavior? A) SO2 B) Ne C) CH4 D) N2 E) H2
What is A
400
A student wishes to prepare 2.00 liters of 0.100-molar KIO3 (molecular weight 214). The proper procedure is to weigh out
What is 42.8 g and add H2O until 2 L is reached
400
Explains the experimental phenomenon of electron diffraction (A) Heisenberg uncertainty principle (B) Pauli exclusion principle (C) Hund's rule (principle of maximum multiplicity) (D) Shielding effect (E) Wave nature of matter
What is E
400
The specific rate constant k for radioactive element X is 0.023 min -1. What weight of X was originally present in a sample if 40. grams are left after 60. minutes?
What is 160 grams
400
CH3CH2OH boils at 78 °C and CH3OCH3 boils at - 24 °C, although both compounds have the same composition. This difference in boiling points may be attributed to a difference in (A) molecular mass (B) density (C) specific heat (D) hydrogen bonding (E) heat of combustion
What is D
400
As the temperature is raised from 20 ° C to 40 ° C, the average kinetic energy of neon atoms changes by a factor of
What is 313/293
500
In a qualitative analysis for the presence of Pb2+, Fe2+, and Cu2+ ions in an aqueous solution, which of the following will allow the separation of Pb2+ from the other ions at room temperature? A) Adding dilute Na2S(aq) solution B) Adding dilute HCl(aq) solution C) Adding dilute NaOH(aq) solution D) Adding dilute NH3(aq) solution E) Adding dilute HNO3(aq) solution
What is E
500
If 87.5 percent of a sample of pure 131I decays in 24 days, what is the half-life of 131I?
What is 8 days
500
The melting point of MgO is higher than that of NaF. Explanations for this observation include which of the following? I. Mg2+ is more positively charged than Na+ II. O2¯ is more negatively charged than F¯ III. The O2¯ ion is smaller than the F¯ ion (A) II only (B) I and II only (C) I and III only (D) II and III only (E) I, II, and III
What is B
500
NH4NO3(s) --> N2O(g) + 2 H2O(g) A 0.03 mol sample of NH4NO3(s) decomposes completely according to the balanced equation above. The total pressure in the flask measured at 400 K is closest to which of the following? ( The value of the gas constant, R, is 0.082 L atm mol¯1 K¯1)
What is 3 atm
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