What are the coefficients for each substance (respectively) in the chemical reaction when balanced?
__C7H14O2 + __O2 -> __CO2 + __H2O
A. 2, 21, 14, 14
B. 2, 19, 14, 14
C. 2, 19, 7, 7
D. 1, 10, 7, 7
B. 2, 19, 14, 14
What is the coefficient for ZnO when the reaction is balanced with smallest whole number coefficients?
__Zn + __O2 -> __ZnO + __SO2
A. 1
B. 2
C. 3
D. 4
B. 2
Which molecule has a 120 degree bond angle?
A. CO2
B. NH3
C. IF3
D. SO3
D. SO3
Which sample deviates most from ideal gas behavior?
A. Xe at 1 atm and -50C
B. Xe at 200 atm and -50C
C. He at 200 atm and -50C
D. Xe at 200 atm and 1000C
B. Xe at 200 atm and -50C
What intermolecular forces are present in a pure sample of ethanol (C2H5OH)?
A. dispersion and ion-dipole
B. dispersion and dipole-dipole
C. hydrogen bonding and ion-dipole
D. dispersion, dipole dipole, and hydrogen bonding
D. dispersion, dipole dipole, and hydrogen bonding
What is the mass of NO2 is formed by the complete reaction of 2 mol O3 with excess NO?
O3 + NO -> O2 + NO2
Molar mass (g/mol): (O3: 48.0) (NO2: 46.0)
A. 23.0g
B. 46.0g
C. 92.0g
D. 5.25
C. 92.0g
Determine the number of moles of carbon dioxide (CO2) formed when 2.5 mol ethanol (C2H6O) udeergoes combustion in excess oxygen.
C2H6O + 3O2 -> 2CO2 + 3H2O
A. 1.25 mol
B. 1.67 mol
C. 2.50 mol
D. 5.00 mol
D. 5.00 mol
Which molecule is polar?
A. CCl4
B. CS2
C. PH3
D. PF5
C. PH3
Why is the boiling point of Br2 higher than that of Cl2?
A. Br2 has greater molar mass and is therefore easier to vaporize
B. Br is less electronegative and therefore its bonding is more ionic
C. Br is more electronegative and therefore has greater dipole-dipole forces
D. Br2 is more polarizable and therefore has greater London dispersion forces
D. Br2 is more polarizable and therefore has greater London dispersion forces
Which substance has the lowest boiling point?
A. CH4
B. CCl4
C. CBr4
D. CI4
A. CH4
How many water molecules are produced if 0.34 mol of propane, C3H8, combusts in excess oxygen?
C3H8 + 5O2 ->3CO2 + 4H2O
A. 5.1x1022
B. 2.1x1023
C. 8.2x1023
D. 2.4x1024
C.
D
C. 8.2x1023
What amount of excess reagent remains when 4.0g zinc react with 2.0g phosphorus?
3Zn + 2P -> 3Zn3P2
A. 0.70g P
B. 1.3g P
C. 0.22g Zn
D. 4.2g Zn
A. 0.70g P
What is the hybridization on the central atom in the molecule GeCl2?
A. sp
B. sp2
C. sp3
D. sp3d
(PQ-26)
B. sp2
A sample of gas occupies 3.00L at 1.00atm. What volume will it occupy at 1.45atm and the same temperature?
A. 2.07L
B. 4.35L
C. 2280L
D. 1572.4L
A. 2.07L
Which point corresponds to the normal boiling point of a substance?
(PQ-28)
C
A mixture of 9 mol F2 and 4 mol S are allowed to react. How many moles of F2 remain after 3 mol of S have reacted?
3F2 + S -> SF6
A. 2
B. 3
C. 1
D. 0
D. 0
What amount of the excess reagent remains when 0.500 mol Li reacts with 0.350 mol N2?
6Li + N2 -> 2Li3N
A. 0.0833 mol N2
B. 0.267 mol N2
C. 0.150 mol Li
D. 0.417 mol Li
B. 0.267 mol N2
How many omega and pi bonds are shown?
A. 3 omega and 12 pi
B. 6 omega and 9 pi
C. 9 omega and 6 pi
D. 12 omega and 3 pi
(PQ-27)
D. 12 omega and 3 pi
What is the density of F2 at 1.00atm and 25.0C?
A. 0.776 g/L
B. 0.850 g/L
C. 1.55 g/L
D. 1.70 g/L
C. 1.55 g/L
The process described by changing the system from point A to point B is ____.
A. condensation
B. evaporation
C. melting
D. sublimation
(PQ-29)
C. melting
How many total molecules will be present when the reaction of 5,000 molecules of CS2 with 15,000 molecules of O2 goes to completion?
CS2 + 3O2 -> CO2 + 2SO2
A. 5,000
B. 10,000
C. 15,000
D. 20,000
C. 15,000
What is the mass (in g) of TiO2 formed when 0.476g TiCl4 are reacted with 0.0501g H2O?
Molar mass (g/mol)
H2O: 18.02
HCl: 36.46
TiCl4: 189.7
TiO2: 79.88
TiCl4 + 2H2O -> TiO2 + 4HCl
A. 0.111g
B. 0.200g
C. 0.222g
D. 1.13g
A. 0.111g
According to MO theory, F2 would
A. have a bond order of 1 and be diamagnetic
B. have a bond order of 1 and be paramagnetic
C. have a bond order of 2 and be diamagnetic
D. have a bond order of 2 and be paramagnetic
(PQ-29)
A. have a bond order of 1 and be diamagnetic
Suppose a gas mixture contains equal moles of HE and O2 gas. Which is true?
A. The partial pressure of each gas is the same
B. The partial pressure of He is four times the partial pressure of O2
C. The partial pressure of O2 is two times the partial pressure of He
D. The partial pressure of O2 is eight times the partial pressure of He
A. The partial pressure of each gas is the same
Which arrow on the phase diagram corresponds to the particle-level phase change shown?
A. 1
B. 2
C. 3
D. 4
(PQ-30)
D. 4