Atomic Bases
In which compound does chlorine have the highest oxidation number? (Q11)
ClF₃
How many lone pairs does sulfur have in SF₄? (Q2)
1 lone pair
Which substance is most soluble in water? (Q1)
the most polar substance (choice A)
Which gas has the greatest molar mass from a speed distribution graph? (Q9)
gas A (highest molar mass)
How many atoms are in one mole of pentanol? (Q22)
1.08 × 10²⁵ atoms
Which sets of quantum numbers describe allowed orbitals? (Q21)
ii and iii
How many resonance structures exist for NO₂⁻? (Q3)
2 resonance structures
What IMF exists between water and an alkene? (Q13)
dipole–induced dipole
How many gas molecules are inhaled in 500 mL of air at 1 atm and 25°C? (Q26)
1.2 × 10²² molecules
What is ΔH°f for SrCO₃(s)? (Q31)
−1220 kJ/mol
How many unpaired electrons are in ground-state Fe? (Q15)
4 unpaired electrons
What is the molecular geometry of ClF₃? (Q6)
T-shaped
Which substance has stronger intermolecular forces based on a vapor pressure graph? (Q10)
molecule B
What is the partial pressure of He in a gas mixture? (Q27)
0.246 torr
Estimate ΔH for combustion of ethylene using bond energies (Q32)
−1291 kJ/mol
Protons, neutrons, and electrons in 62Ni2+^{62}Ni^{2+}62Ni2+? (Q16)
28 protons, 34 neutrons, 26 electrons
What hybrid orbitals are on the oxygen shown? (Q8)
sp³
Which gas sample has the greatest density? (Q41)
MgS
Which gas sample has the greatest density? (Q41)
10 L of He at 273 K and 2 atm
Which aqueous solution conducts the least electricity? (Q29)
0.5 M glucose (C₆H₁₂O₆)
What electronic transition is shown on a hydrogen energy diagram? (Q20)
an electronic transition from one excited state to another excited state
Rank bonds by increasing polarity: C–O, Si–O, C–N, S–S (Q19)
S–S < C–N < C–O < Si–O
What is the concentration of N₂ dissolved in water using Henry’s Law? (Q42)
iii < i < ii
What is the concentration of N₂ dissolved in water using Henry’s Law? (Q42)
7.0 × 10⁻⁴ M
How many grams of acetic acid produce 22.4 L CO₂ at STP? (Q35)
120 g of CH₃COOH