Welcome to your chemistry 2008
1.
A drug decomposes by zero-order kinetics with a rate constant of 2mgmL-1 month-1. If the initial concentration is 100mgmL-1, how long will it take for the drug to decompose by 10%?
2.
The value of Keq for the following reaction is 0.25.
3.
Which of the following would react to form pentyl ethanoate?
4.
Which of the following is correct when 34495 is rounded to three significant figures?
5.
What is the first step of the scientific method?
6.
Which of the following are not electromagnetic waves?
7.
What is the distance that a radio wave will travel in 0.250sec?
8.
Which of the following is not a form of chemical bonding?
9.
Which of the following statements is not true about covalent bonding?
10.
If we increase the concentration of a reactant, what happens to the collision between particles?
11.
How many moles of NH4Cl must be added to 1.5L of 0.2M solution of NH3 to form a buffer whose PH is 9.0 (Kb = 1.8 x 10-5)?
12.
What mass of magnesium is plated out upon electrolysis from molten MgCl2 using a current of 60A for a period of 4000 seconds?
13.
For a voltaic (or galvanic) cell using Ag, Ag+ (1.0m) and Zn, Zn2+ (1.0m) half cells, which of the following statements is incorrect?
14.
The difference between fats and oils is that
15.
What kind of solution forms when gasoline evaporates in air?
16.
What is the solvent in 70% alcohol solution?
17.
How many moles of H2SO4 are needed to prepare 5.0 liters of a 2.0M solution of H2SO4?
18.
What is the balanced net ionic equation for the reaction of CaCl2 and AgNO3?
19.
The Ka of Hypochlorous acid (HClO) is 3.0 x 10-4 at 250C. What is the % ionization of hypochlorous acid in a 0.015M aqueous solution of HClO at 250C?
20.
Which of the following combinations cannot produce a buffer solution?
21.
What is the molality of a solution that contains 51.2gm of naphthalene, C10H8 in 500ml of carbon tetrachloride? The density of CCl4 is 1.60gm/ml
22.
What is the ionization constant for a weak acid, Ha, that is 1.60% ionized in 0.0950M solution?
23.
Which of the following is correct?
24.
For the Galvanic cell shown below, which one of the following statement is correct
25.
What is the most common Ore used for the extraction of copper?
26.
Which of the following materials has the maximum ductility?
27.
Which of the following statements about polyvinyl chloride is not correct?
28.
Which of the following is a natural polymer?
29.
Which of the following does not affect the solubility of a gas dissolved in a liquid?
30.
When a small amount of crystal solute is added to the super saturated solution, the solute crystals will
31.
Which of the following electrons, identified only by their n and l quantum numbers have the highest energy?
32.
What is the maximum number of unpaired electron in a d subshell?
33.
The following energy level diagram represents the out most shell of what ground state element?
34.
Which of the following represents a tentative explanation of a certain scientific law?
35.
In order to advance the level of a theory, a hypothesis should:
36.
Which of the following types of rays combine to form atoms of Helium?
37.
What is the relationship between frequency (V), wavelength ( λ) and the speed of light (c)?
38.
What is the magnitude of quantum energy and the frequency for an object whose wave length is 0.6 x 10-6m?
39.
What new concept did Bohr adapt and use to formulate his made of the atom?
40.
What values of l are permitted for an electron with n = 4?
41.
What would happen to the oxygen molecule upon ionization to O2+?
42.
For a first order reaction, a plot of _____ versus _____ is linear.
43.
The rate law of the overall reaction A + B → C is rate = K [A]2 which of the following will not increase the rate of the reaction?
44.
How many bonding pairs and lone pairs, respectively does the ion ICl4- have?
45.
Which of the following molecule does not have a tetrahedral central atom?
46.
Acrylonitrile has the following Lewis structure with the designation of x, y and z for each carbon atom. What will be the value of the bond angle and geometry of
47.
Antimony (Sb) is a group v element, what will be the molecular geometry and number of lone pair electrons, respectively that exists in the ion [SbCl5]2-?
48.
Which of the following molecules does not have a trigonal bipyramidal electron-pair geometry?
49.
How many atomic orbitals are required for an sp3 hybridization?
50.
Formic acid, which is released by ants, has a molecular formula of HCOOH. What are the possible hybridizations that exist in the molecule?
51.
Consider the following reaction: What will be the main product of the reaction above
52.
Which of the following statements concerning the carbonyl group in aldehydes and ketones is not true?
53.
Which of the following statements concerning fats and oils is incorrect?
54.
Which of the following statement(s) is (are) applicable to a balanced chemical equation of an elementary reaction?
55.
At high pressure, the following reaction is zero order, Which of the following options is (are) correct for this reaction?
56.
Which of the following expressions is correct for the rate of reaction given below?
57.
Rate law for the reaction A + 2B → C is found to be
58.
The following equilibrium constants were determined at 3000C.
59.
When 0.50 mol of N2O4 is placed in a 4.0 liter reaction vessel and heated to 400k, 80% of the N2O4 decomposes to NO2 gas as follows:
60.
Which of the following is not true about carbonyl compounds?
61.
Sodium acetate spontaneously crystallizes out of a supersaturated solution on standing Which of the following is true for the thermodynamic quantities of this system for such a process?
62.
In which of the following systems will the position of equilibrium shift to the left upon an increase in pressure, but to the right upon an increase in temperature?
63.
The hydrogen used in the Haber process is made by the following reaction
64.
Which of the following types of compounds are expected products from the saponification of a fat?
65.
Which one of the following statements best describes the standard enthalpy of formation of any element?
66.
Equal masses of He and Ne are placed in a sealed container. What is the partial pressure of Ne, if the total pressure is 6 atm?
67.
What is the molarity of a solution made by dissolving 10g of glucose (C2H12O6) in sufficient water to form 200ml solution?
68.
In which direction will the following equilibrium shift, if a solution of CH3CO2Na is added?
69.
A 1.0M solution a weak acid is found to dissociate by only 1.37%. Which of the following acid is it likely to be?
70.
Consider the following graph, which relates to the equilibrium system:
71.
A 1.0 x 10-4M solution has a PH of 10.00. The solution is a
72.
The four most abundant metals in the earth's crust decreasing order of abundance are:
73.
A polysaccharide is a polymer made up of which kind of monomers?
74.
What is the molar solubility of Fe(OH)3 in a solution that is buffered at PH = 3.50 at 250C? Ksp (Fe(OH)3 = 4 x 10-38)
75.
What is the purpose of a salt bridge in an electrochemical cell?
76.
What is galvanized iron?
77.
The standard cell potential (E0) for the reaction below is 1.10v. What is the cell potential for this reaction when [Cu2+] = 1 x 10-5M and [Zn2+] = 1M?
78.
Which of the following statements is true?
79.
Which of the following types of elements are good oxidizing agents?
80.
Which of the following statements concerning petroleum is Not correct?
