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The lab setup shown above was used for the gravimetric analysis of the empirical formula of MgO. In synthesizing MgO from a Mg strip in the crucible, which of the following is NOT true?
A. The initial strip of Mg should be cleaned.B. The lid of the crucible should fit tightly to exclude oxygen.C. The heating of the covered crucible should continue until the Mg is fully reacted.D. The crucible, lid, and the contents should be cooled to room temperature before measuring their mass.E. When the Mg appears to be fully reacted, the crucible lid should be partially removed and heating continued.
2. Question below refers to the following experimental setup and data:
Weight of U-tube................................ 20.36 g
Weight of U-tube and calcium chloride before................................................... 39.32 g
Weight of U-tube and calcium chloride after................................................... 57.32 g
Weight of boat and contents (copper oxide) before................................................... 30.23 g
Weight of boat and contents after................................................... 14.23 g
Weight of boat...................................................5.00 g
What is the reason for the first CaCl2 drying tube?
A. Generate waterB. Absorb hydrogenC. Absorb water that evaporates from the flaskD. Decompose the water from the flaskE. Act as a catalyst for the combination of hydrogen and oxygen
3. Question below refers to the following experimental setup and data:
What conclusion can be derived from the data collected?
A. Oxygen was lost from the CaCl2.B. Oxygen was generated in the U-tube.C. Water was formed from the reaction.D. Hydrogen was absorbed by the CaCl2.E. CuO was formed in the decomposition.
4. Question below refers to the following experimental setup and data:
What is the ratio of the mass of water formed to the mass of hydrogen used in the formation of water?
A. 1 : 8B. 1 : 9C. 8 : 1D. 9 : 1E. 8 : 9
5. What is the mass, in grams, of 1 mole of KAl(SO4)2 · 12H2O?
A. 132B. 180C. 394D. 474E. 516
6. What mass of aluminum will be completely oxidized by 2 moles of oxygen at STP?
A. 18 gB. 37.8 gC. 50.4 gD. 72.0 gE. 100.8 g
7. In general, when metal oxides react with water, they form solutions that are
A. acidicB. basicC. neutralD. unstableE. colored
The oxidation reaction will occur at
A. A B. B C. C D. D E. E
The apparatus at C is called the
A. anodeB. cathodeC. salt bridgeD. ion bridgeE. osmotic bridge
The standard potentials of the metals are:
Zn2+ + 2e- → Zn0 E0 = -0.76 volt
Cu0 → Cu2+ + 2e- E0 = -0.34 volt
What will be the voltmeter reading for this reaction?
A. +1.10B. -1.10C. +0.42D. -0.42E. -1.52
11. How many liters of oxygen (STP) can be prepared from the decomposition of 212 grams of sodium chlorate (1 mol = 106 g)?
A. 11.2B. 22.4C. 44.8D. 67.2E. 78.4
12. In this equation: Al(OH)3 + H2SO4 → Al2(SO4)3 + H2O, the whole-number coefficients of the balanced equation are
A. 1, 3, 1, 2B. 2, 3, 2, 6C. 2, 3, 1, 6D. 2, 6, 1, 3E. 1, 3, 1, 6
13. What is Hreaction for the decomposition of 1 mole of sodium chlorate? (Hf0 values: NaClO3(s) = -85.7 kcal/mol, NaCl(s) = -98.2 kcal/mol, O2(g) = 0 kcal/mol)
A. -183.9 kcalB. -91.9 kcalC. +45.3 kcalD. +22.5 kcalE. -12.5 kcal
14. Isotopes of an element are related because which of the following is (are) the same in these isotopes?
I. Atomic mass
II. Atomic number
III. Arrangement of orbital electrons
A. I onlyB. II onlyC. I and II onlyD. II and III onlyE. I, II, and III
15. In the reaction of zinc with dilute HCl to form H2, which of the following will increase the reaction rate?
I. Increasing the temperature
II. Increasing the exposed surface of zinc
III. Using a more concentrated solution of HCl
A. I onlyB. II onlyC. I and III onlyD. II and III onlyE. I, II, and III
The laboratory setup shown above can be used to prepare a
A. gas lighter than air and soluble in waterB. gas heavier than air and soluble in waterC. gas soluble in water that reacts with waterD. gas insoluble in waterE. gas that reacts with water
17. In this reaction: CaCO3 + 2HCl → CaCl2 + H2O + CO2. If 4.0 moles of HCl are available to the reaction with an unlimited supply of CaCO3, how many moles of CO2 can be produced at STP?
A. 1.0B. 1.5C. 2.0D. 2.5E. 3.0
18. A saturated solution of BaSO4 at 25°C contains 3.9 × 10-5 mole/liter of Ba2+ ions. What is the Ksp of this salt?
A. 3.9 × 10-5B. 3.9 × 10-6C. 2.1 × 10-7D. 1.5 × 10-8E. 1.5 × 10-9
19. If 0.1 mole of K2SO4 was added to the solution in question 64, what would happen to the Ba2+ concentration?
A. It would increase.B. It would decrease.C. It would remain the same.D. It would first increase, then decrease.E. It would first decrease, then increase.
20. Which of the following will definitely cause the volume of a gas to increase?
I. Decreasing the pressure with the temperature held constant.
II. Increasing the pressure with a temperature decrease.
III. Increasing the temperature with a pressure increase.
21. The number of oxygen atoms in 0.50 mole of Al2(CO3)3 is
A. 4.5 × 1023B. 9.0 × 1023C. 3.6 × 1024D. 2.7 × 1024E. 5.4 × 1024
22. Question below refers to a solution of 1 M acid, HA, with Ka = 1 × 10-6.
What is the H3O+ concentration? (Assume [HA] = 1, [H3O+] = x, [A-] = x.)
A. 1 × 10-5B. 1 × 10-4C. 1 × 10-2D. 1 × 10-3E. 0.9 × 10-3
23. What is the percent dissociation of acetic acid in a 0.1 M solution if the [H3O+] is 1 × 10-3 mole/liter?
A. 0.01%B. 0.1%C. 1.0%D. 1.5%E. 2.0%
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