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Q:
Dissolving 0.010 mole of which of the following in enough water to make 0.250 L of solution would result in a solution with the highest pH?
A) NaH
B) CaH2
C) NH3
D) PH3
Q:
The net ionic reaction of solid CaH2 with water isA) CaH2(s) + 2 H2O(l) -> Ca(OH)2(aq) + 2 H2(g)B) CaH2(s) + 2 H2O(l) -> Ca2+(aq) + 2 OH-(aq) + 2 H2(g)C) H-(aq) + H2O(l) -> OH-(aq) + H2(g)D) CaH2(s) + H2O(l) -> CaO(s) + 2 H2(g)
Q:
Which of the following binary hydrides has the highest melting point?
A) AlH3
B) CaH2
C) NH3
D) SiH4
Q:
In which set are all compounds considered to be covalent binary hydrides?
A) NaH, KH, CaH2, BaH2
B) MgH2, SrH2, AlH3, SiH4
C) BeH2, B2H6, CH4, NH3
D) MgH2, AlH3, SiH4, H2S
Q:
In which set are all compounds considered to be ionic binary hydrides?
A) NaH, KH, CaH2, BaH2
B) MgH2, SrH2, AlH3, SiH4
C) BeH2, B2H6, CH4, NH3
D) MgH2, AlH3, SiH4, H2S
Q:
Which is an ionic binary hydride?
A) HCl
B) KH
C) both HCl and KH
D) neither HCl nor KH
Q:
What is the Lewis electron dot structure for the hydride ion?A) H+B) H: -C) H D) H3O+
Q:
How many kilojoules of energy are released when 90.0 grams of water are produced in the reaction shown below?2 H2(g) + O2(g) -> 2 H2O(l) H = -572 kJA) 5720 kJB) 2860 kJC) 1430 kJD) 715 kJ
Q:
How many liters of hydrogen gas are needed to produce 90.0 grams of water at 25.0C and 1.00 atm pressure according to the chemical equation shown below?2 H2(g) + O2(g) -> 2 H2O(l)A) 61.1 LB) 122 LC) 183 LD) 366 L
Q:
What is the total volume of the mixture of hydrogen gas and oxygen gas can be obtained from the electrolysis of 90.0 grams of water at 25.0C and 1.00 atm pressure according to the chemical equation shown below?
2 H2O(l) 2 H2(g) + O2(g)
A) 61.1 L
B) 122 L
C) 183 L
D) 366 L
Q:
How many grams of zinc metal are required to produce 1.00 liter of hydrogen gas at STP according to the chemical equation shown below? A) 0.0343 g
B) 2.92 g
C) 5.84 g
D) 65.4 g
Q:
How many grams of H2 gas gas can be produced by the reaction of 27.0 grams of Al(s) with an excess of dilute hydrochloric acid in the reaction shown below?2 Al(s) + 6 HCl(aq) -> 2 AlCl3(aq) + 3 H2(g)A) 1.34 gB) 2.02 gC) 3.03 gD) 6.06 g
Q:
The largest single industrial use of hydrogen is
A) in the synthesis of methanol.
B) in the synthesis of ammonia.
C) in the hydrogenation of fats and oils.
D) as an automobile fuel.
Q:
The first step in the steam-hydrocarbon re-forming process is shown below.H2O(g) + CH4(g) -> CO(g) + 3 H2(gWhat is the change in oxidation number of the atom undergoing oxidation in this reaction?A) - 2B) + 1C) + 2D) + 6
Q:
Write a chemical equation representing the water gas shift reaction.A) H2O(g) + CH4(g) -> CO(g) + 3 H2(g)B) 2 H2O(l) -> 2 H2(g) + O2(g)C) CO(g) + H2O(g) -> CO2(g) + H2(g)D) 4 H2O(g) + 3 Fe -> Fe3O4(s) + 4 H2(g)
Q:
What is not a commercial method for the preparation of hydrogen gas?A) H2O(g) + CH4(g) -> CO(g) + 3 H2(g)B) 2 H2O(l) -> 2 H2(g) + O2(g)C) H2O(g) + C(s) -> CO(g) + H2(g)D) 4 H2O(g) + 3 Fe -> Fe3O4(s) + 4 H2(g)
Q:
Consider the hypothetical isotope of hydrogen, quadrium, Q = 4H. Q2O would have a melting point that is (higher, lower) and a dissociation constant Kw that is (larger smaller) than H2O.
A) higher, larger
B) higher, smaller
C) lower, larger
D) lower, smaller
Q:
If the molar mass of monoatomic deuterium (D) is 2.0141 grams then what is the density of diatomic deuterium (D2) gas at 25.0C and 1.00 atmosphere pressure?
A) 0.082 g/L
B) 0.165 g/L
C) 0.329 g/L
D) 12.2 g/L
Q:
The dissociation of D2O is shown below.D2O D+(aq) + OD-(aq) K = 1.95 10-15 at 25CIn order to be acidic a D2O solution must have a pH (= pD) that isA) greater than 7.00B) greater than 7.35C) less than 7.00D) less than 7.35
Q:
Differences in the physical properties of H2O and D2O are due to isotope effects. Which comparison is not correct? Compared to H2O, D2O has a higher
A) boiling point.
B) density.
C) dissociation constant.
D) melting point.
Q:
Which isotope of diatomic hydrogen should have the highest heat of vaporization?
A) H2
B) D2
C) T2
D) The values are equal.
Q:
Which is not an isotope of hydrogen?
A) hydrogen-1
B) hydrogen-2
C) hydrogen-3
D) hydrogen-4
Q:
Hydrogen, H2, has a very low boiling point. What is the force that must be overcome in order to boil hydrogen?
A) dipole-dipole
B) HH covalent bonding
C) hydrogen bonding
D) London dispersion
Q:
The strongest homonuclear single bond isA) H-HB) C-CC) N-ND) O-O
Q:
Which individual is generally given credit for the discovery of hydrogen gas?
A) Cavendish
B) Davy
C) Lavoisier
D) Priestley
Q:
Anhydrous magnesium sulfate can be used as a drying agent to remove moisture from the atmosphere. If the only product of this reaction is magnesium sulfate heptahydrate, how many grams of water can be removed by 0.500 kg of magnesium sulfate?
Q:
Gas hydrates are solids in which a gas is encased in a polyhedral cage formed of water molecules. One gas hydrate structure has the general formula Gx(H2O)46. Xenon forms a gas hydrate having the composition 55.90% Xe, 4.93% H, and 39.17% O. What is the value of x in the xenon gas hydrate Xex(H2O)46?
Q:
The oxygen-oxygen bond order in ozone, O3, is ________. The oxygen-oxygen bond in O3 is ________ than the oxygen-oxygen bond in O2, so O3 is ________ reactive than O2.
Q:
Hydrogen peroxide can act as an oxidizing agent or a reducing agent. The reaction of hydrogen peroxide with permanganate ion in acidic solution is shown below.H2O2(aq) + 2 MnO4-(aq) + 6 H+ -> 5 O2(g) + 2 Mn2+(aq) + 8 H2O(l)In this reaction hydrogen peroxide acts as the ________ agent, and the ________ atom undergoes a change in oxidation number from ________ to ________.
Q:
Of O2, O2-, and O22-, the oxygen-oxygen bond length is expected to be longest in ________ and shortest in ________.
Q:
Superoxide ion, O2-, peroxide ion, O22-, and oxide ion, O2-, contain ________, ________, and ________ unpaired electrons, respectively.
Q:
The high-temperature superconductor, YBa2Cu3O7 can be prepared by the reaction shown below.2 Y2O3 + 8 BaO + 12 CuO + O2 -> 4 YBa2Cu3O7How many liters of oxygen at 800C and 1.00 atm are required to completely react with 452 g of Y2O3?
Q:
Of Na2O, SO2, and SO3, equimolar aqueous solutions of ________ would be most acidic and of ________ would be most basic.
Q:
Binary oxides can be classified as acidic, amphoteric, or basic. MgO, Al2O3, and SO3 are classified as ________, ________, and ________ oxides, respectively.
Q:
The carbon atom in CO2 is -bonded to two oxygen atoms. The silicon atom in SiO2 is ________-bonded to ________ oxygen atoms.
Q:
The direct methanol fuel cell (DMFC), a galvanic cell proposed for use in consumer products, employs the overall reaction shown below. How many liters of oxygen at 25C and 1.00 atm are required to completely react with 0.641 g of CH3OH?2 CH3OH(aq) + 3 O2(g) -> 2 CO2(g) + 4 H2O(l)
Q:
The preparation of oxygen by the thermal decomposition of potassium chlorate is shown below.
2 KClO3(s) 2 KCl(s) + 3 O2(g)
In this reaction the atom that is reduced is ________, which undergoes an oxidation number change from ________ to ________.
Q:
A reaction occurs when 0.2105 g of CaH2 is dissolved in enough water to make 250 mL of solution will generate ________ liters of hydrogen gas at 0.972 atm and 21C
Q:
A reaction occurs when 0.2105 g of CaH2 is dissolved in enough water to make 250 mL of solution. This solution will have a pH = ________.
Q:
An element that forms a covalent hydride tends to form an oxide that is ________ (acidic, basic).
Q:
An element that forms a basic oxide tends to form a hydride that is ________ (covalent, ionic).
Q:
Of LiH, SiH4, H2S, and HF, the binary hydrides expected to have the lowest and highest melting points are ________ and ________, respectively.
Q:
The strongest force that must be overcome in order to melt LiH, SiH4, H2S, and HF is ________, ________,________, and ________, respectively.
Q:
Sodium hydride, NaH, reacts with water as shown in the equation below.NaH(s) + H2O(l) -> H2(g) + Na+(aq) + OH-(aq)In this reaction the oxidation number of hydrogen in NaH, H2O, H2, and OH- is ________, ________,________, and ________, respectively.
Q:
Binary hydrides can be classified as covalent, ionic, or metallic. NaH, HCl, and NH3 are classified as ________, ________, and ________ binary hydrides, respectively.
Q:
The first step in the steam-hydrocarbon re-forming process for the industrial preparation of hydrogen is shown below.
H2O(g) + CH4(g) CO(g) + 3 H2(g)
In this reaction the atom that is oxidized is ________, which undergoes an oxidation number change from ________ to ________.
Q:
At 25C the dissociation constant Kw for T2O is 0.06 10-14. What is the molar concentration of OT- in 0.025 M TCl?
Q:
At 25C the dissociation constant Kw for D2O is 0.195 10-14. What is the molar concentration of OD- in 0.025 M DCl?
Q:
An example of an isotope effect is the difference in the dissociation of D2O compared to H2O, as shown below.H2O(l) H+(aq) + OH-(aq) K =1.0 10-14T2O(l) T+(aq) + OT-(aq) K =6.0 10-16A neutral H2O solution has a pH = ________, whereas a neutral T2O solution has a pH = pD = ________.
Q:
An example of an isotope effect is the difference in the dissociation of D2O compared to H2O, as shown below.H2O(l) H+(aq) + OH-(aq) K =1.0 10-14D2O(l) D+(aq) + OD-(aq) K =2.0 10-15A neutral H2O solution has a pH = ________, whereas a neutral D2O solution has a pH = pD = ________.
Q:
Hydrogen has three isotopes, , , and , which are called ________, ________, and ________, respectively.
Q:
When 0.350 grams of anhydrous copper(II) sulfate is exposed to moist air, it absorbs water. If the hydrated copper compound has a mass of 0.508 grams, what is the chemical formula of the hydrate?A) CuSO4 . 2H2OB) CuSO4 . 3H2OC) CuSO4 . 4H2OD) CuSO4 . 5H2O
Q:
A 0.954-gram sample of hydrated magnesium sulfate, MgSO4. xH2O, is heated until all of the water is driven off. If 0.465 grams of anhydrous MgSO4 is obtained, how many water molecules combine with each formula unit of magnesium sulfate in the hydrate?A) 5B) 6C) 7D) 8
Q:
When 1.800 grams of anhydrous magnesium chloride were exposed to moist air, water was absorbed by the sample. If the resulting hydrated compound has a mass of 2.481 grams, what is the chemical formula of the hydrate?A) MgCl2. H2OB) MgCl2 . 2H2OC) MgCl2 . 3H2OD) MgCl2 . 4H2O
Q:
How many milliliters of ozone gas at at 25.0C and 1.00 atm pressure are needed to react with 45.00 mL of a 0. 400 M aqueous solution of KI according to the chemical equation shown below?O3(g) + 2 I-(aq) + H2O(l) -> O2(g) + I2(s) + 2 OH-(aq)A) 220. mLB) 441 mLC) 661 mLD) 881 mL
Q:
How many liters of O2 gas at 25C and 1.00 atm pressure are needed to react with 60.25 grams of potassium hydride according to the chemical equation shown below?2 KH(s) + O2(g) -> H2O(l) + K2O(s)A) 9.19 LB) 18.4 LC) 36.8 LD) 73.5 L
Q:
What is the total volume of hydrogen gas and oxygen gas that can be produced from the thermal decomposition of 0. 0425 grams of H2O2 at 700C and 755 mm Hg according to the chemical equation shown below?H2O2(l) -> H2(g) + O2(g)A) 50.2 mLB) 100 mLC) 151 mLD) 201 mL
Q:
How many liters of oxygen gas can be produced at STP from the decomposition of 0.250 L of 3.00 M H2O2 in the reaction according to the chemical equation shown below? A) 8.41 L
B) 11.2 L
C) 16.8 L
D) 33.6 L
Q:
How many grams of KCl(s) are produced from the thermal decomposition of KClO3(s) which produces 50.0 mL of O2(g) at 25C and 1.00 atm pressure according to the chemical equation shown below?2 KClO3(s) -> 2 KCl(s) + 3 O2(g)A) 0. 102 gB) 0. 152 gC) 0. 167 gD) 0. 304 g
Q:
How many mL of O2 gas at 25C and 755 mm Hg pressure can be produced from the thermal decomposition of 0.300 grams of KClO3(s) according to the chemical equation shown below?2 KClO3(s) -> 2 KCl(s) + 3 O2(g)A) 30.1 mLB) 40.2 mLC) 90.4 mLD) 181 mL
Q:
What is the total volume of the mixture of hydrogen gas and oxygen gas can be obtained from the electrolysis of 110.0 grams of water at 25.0C and 1.00 atm pressure according to the chemical equation shown below?2 H2O(l) -> 2 H2(g) + O2(g)A) 74.7 LB) 149 LC) 224 LD) 447 L
Q:
How many liters of hydrogen gas are needed to produce 100.0 grams of water at 25.0C and 1.00 atm pressure according to the chemical equation shown below?2 H2(g) + O2(g) -> 2 H2O(l)A) 67.9 LB) 136 LC) 203 LD) 407 L
Q:
How many grams of water are required to produce 5.50 L of hydrogen gas at 25.0C and 755 mm Hg pressure according to the chemical equation shown below?BaH2(s) + 2 H2O(l) -> Ba(OH)2(aq) + 2 H2(g)A) 2.01 gB) 4.02 gC) 4.07 gD) 8.04 g
Q:
How many liters of hydrogen gas can be generated by reacting 9.25 grams of barium hydride with water at 20C and 755 mm Hg pressure according to the chemical equation shown below?BaH2(s) + 2 H2O(l) -> Ba(OH)2(aq) + 2 H2(g)A) 0. 219 LB) 0. 799 LC) 1.60 LD) 3.21 L
Q:
How many grams of calcium hydride are required to produce 4.56 L of hydrogen gas at 25.0C and 0.975 atm pressure according to the chemical equation shown below?CaH2(s) + 2 H2O(l) -> Ca(OH)2(aq) + 2 H2(g)A) 3.82 gB) 7.64 gC) 15.3 gD) 45.6 g
Q:
How many grams of zinc metal are required to produce 2.00 liters of hydrogen gas at STP according to the chemical equation shown below?Zn(s) + 2 HCl(aq) -> ZnCl2(aq) + H2(g)A) 0. 171 gB) 5.83 gC) 11.7 gD) 131 g
Q:
How many grams of H2 gas can be produced by the reaction of 54.0 grams of Al(s) with an excess of dilute hydrochloric acid in the reaction shown below?2 Al(s) + 6 HCl(aq) -> 2 AlCl3(aq) + 3 H2(g)A) 2.68 gB) 4.04 gC) 6.05 gD) 12.1 g
Q:
The following molecular orbital energy level diagram shows the energies and occupancies of the MOs derived from the atomic 2p orbitals for an oxygen-containing binary compound of potassium. This compound is aA) peroxide that is attracted by magnetic fields.B) peroxide that is repelled by magnetic fields.C) superoxide that is attracted by magnetic fields.D) superoxide that is repelled by magnetic fields.
Q:
The following molecular orbital energy level diagram shows the energies and occupancies of the MOs derived from the atomic 2p orbitals for an oxygen-containing binary compound of potassium. This compound is a A) peroxide that is attracted by magnetic fields.
B) peroxide that is repelled by magnetic fields.
C) superoxide that is attracted by magnetic fields.
D) superoxide that is repelled by magnetic fields.
Q:
The following molecular orbital energy level diagram shows the energies and occupancies of the MOs derived from the atomic 2p orbitals for an oxygen-containing binary compound of potassium. This compound is a A) peroxide having a stronger O-O bond than O2.
B) peroxide having a weaker O-O bond than O2.
C) superoxide having a stronger O-O bond than O2.
D) superoxide having a weaker O-O bond than O2.
Q:
The following molecular orbital energy level diagram shows the energies and occupancies of the MOs derived from the atomic 2p orbitals for an oxygen-containing binary compound of potassium. This compound is a A) peroxide having a stronger O-O bond than O2.
B) peroxide having a weaker O-O bond than O2.
C) superoxide having a stronger O-O bond than O2.
D) superoxide having a weaker O-O bond than O2.
Q:
Look at the location of elements A, B, C, and D in the following periodic table. The oxide of which element in its highest oxidation state is a liquid? A) A
B) B
C) C
D) D
Q:
Look at the location of elements A, B, C, and D in the following periodic table. The oxide of which element in its highest oxidation state can react with both H+(aq) and OH-(aq)? A) A
B) B
C) C
D) D
Q:
The oxide of which element, identified by letters A, B, C, and D in the following periodic table, is most basic in its highest oxidation state? A) A
B) B
C) C
D) D
Q:
The oxide of which element, identified by letters A, B, C, and D in the following periodic table, is most acidic in its highest oxidation state? A) A
B) B
C) C
D) D
Q:
Which oxide has the lowest melting point?
A) A
B) B
C) C
D) D
Q:
Which oxide has the highest melting point?
A) A
B) B
C) C
D) D
Q:
Which oxide is a solid with an infinitely extended three-dimensional crystal structure?
A) A
B) B
C) C
D) D
Q:
Which oxide is the most basic?
A) A
B) B
C) C
D) D
Q:
Which oxide is the most acidic?
A) A
B) B
C) C
D) D