LaboratoryM–1
SECTION M: LABORATORY
INDEX: M001LEVEL: (U)ANSWER: (B)KEYWORDS: introductory concepts
ALTERNATIVE FORMAT: (SA)
Omit responses. / What is the correctly reported mass of water based on this data?
Mass of beaker and water 29.62 g
Mass of beaker only 28.3220 g
(A)1.3 g(B)1.30 g(C)1.298 g(D)1.2980 g
INDEX: M002LEVEL: (U)ANSWER: (C)
KEYWORDS: introductory concepts
ALTERNATIVE FORMAT: (SA)
Omit responses. / What is the correct reading for the buret?
(A)32 mL(C)32.26 mL
(B)32.2 mL(D)33.74 mL
INDEX: M003LEVEL: (U)ANSWER: (C)
KEYWORDS: introductory concepts
ALTERNATIVE FORMAT: (TF)
A(n) will deliver a 25.00 mL liquid sample more precisely than a(n) . Use pairs of responses in separate questions. / To deliver a 25.00 mL liquid sample most precisely, which piece of glassware would you use?
(A)volumetric flask(C)volumetric pipet
(B)graduated cylinder(D)eye dropper
INDEX: M004LEVEL: (U)ANSWER: (A)
KEYWORDS: introductory concepts
ALTERNATIVE FORMAT: (SA)
Omit responses. / A student determined the percent water in a sample. In four trials values of 16.145, 16.160, 16.156, and 17.279 were obtained for the percent water in a sample. What value should be used for the reported percent water?
(A)16.154(B)16.435(C)16.145(D)17.279
INDEX: M005LEVEL: (U)ANSWER: (C)
KEYWORDS: introductory concepts
ALTERNATIVE FORMAT: (TF)
The melting point of an impure compound is generally . Use pairs of responses in separate questions. / The melting point of an impure compound is generally
(A)higher than that of the pure solid.
(B)the same as that of the pure solid.
(C)lower than that of the pure solid.
(D)a function of the vapor pressure of the impurity.
INDEX: M006LEVEL: (A)ANSWER: (C)
KEYWORDS: introductory concepts
ALTERNATIVE FORMAT: (FR)
Devise a procedure that can be used to demonstrate experimentally that the reaction
2Mg + O2 2MgO
obeys the Law of Conservation of Matter. / Which procedure can be used to demonstrate experimentally that the reaction
2Mg + O2 2MgO
obeys the Law of Conservation of Matter?
(A)Take a mass of 1.0000 g of Mg ribbon, burn it in pure O2, and compare the mass of the product with the original mass of the Mg.
(B)Show that the sum of 2 atomic molar masses of Mg plus 1 molar mass of O2 is equal to 2 molar masses of MgO.
(C)Determine the mass of a sealed flash-bulb containing magnesium and oxygen, ignite the mixture, cool, and compare the final mass of bulb plus contents with the original mass of the bulb plus contents.
(D)Burn 1.0000 g of Mg ribbon in a tall beaker filled with air, scrape out all of the MgO formed, and compare with the original mass of the Mg.
INDEX: M007LEVEL: (A)ANSWER: (D)
KEYWORDS: introductory concepts, solutions and colloids
ALTERNATIVE FORMAT: (SA)
Some sodium chlorate, NaClO3, is decomposed by heating and all its oxygen is driven out. What is a suitable solvent for removing the residue in the test tube? / Some sodium chlorate, NaClO3, is decomposed by heating and all its oxygen is driven out. What is the best solvent for removing the residue in the test tube?
(A)alcohol(D)hot water
(B)aqua regia(E)nitric acid
(C)carbon disulfide
INDEX: M008LEVEL: (U)ANSWER: (D)
KEYWORDS: introductory concepts
ALTERNATIVE FORMAT: (FR)
Describe a suitable method of transferring a coarsely powdered solid to a six–inch test tube. / The best method of transferring a coarsely-powdered solid to a six–inch test tube is to
(A)pour it through a glass funnel.
(B)pour it from the lip of an evaporating dish.
(C)use the tip end of a flat spatula.
(D)pour it from a creased square of paper.
(E)pour it from the bottle originally containing the solid.
INDEX: M009LEVEL: (U)ANSWER: (B)
KEYWORDS: gases
ALTERNATIVE FORMAT: (SA)
Omit responses. / Some nitrogen is collected in the laboratory by displacing mercury in a graduated test tube, as indicated by the apparatus. If the room temperature is 25 °C and the barometric pressure is 760 mmHg, what additional information is most essential in order to calculate the volume of nitrogen under standard conditions?
(A)the height AC
(B)the height AB
(C)the vapor pressure of mercury
(D)the density of nitrogen in S
(E)the density of mercury
INDEX: M010LEVEL: (U)ANSWER: (E)
KEYWORDS: introductory concepts
ALTERNATIVE FORMAT: (TF)
The indicator on a furnace thermostat in use is an example of . Use each response in a separate question. / The indicator on a furnace thermostat in use is an example of
(A)a barometer.
(B)a graduated cylinder.
(C)a hydrometer.
(D)a gas–measuring tube.
(E)a thermometer.
INDEX: M011LEVEL: (A)ANSWER: (D)
KEYWORDS: gases
ALTERNATIVE FORMAT: (TF)
The flask, A, is immersed in a cold–water bath, B, at room temperature. Flask A and connecting tube to point C are filled with pure carbon monoxide. The “U” tube from C to D contains mercury and the sealed tube above D is filled with air. After bath B is heated to 80 °C, the mercury levels are most probably at . Use each response in a separate question. / The flask, A, is immersed in a cold–water bath, B, at room temperature. Flask A and connecting tube to point C are filled with pure carbon monoxide. The “U” tube from C to D contains mercury and the sealed tube above D is filled with air. After bath B is heated to 80 °C, the mercury levels are most probably at
(A)C and D(D)F and G
(B)E and G(E)F and H
(C)E and H.
INDEX: M012LEVEL: (A)ANSWER: (B)
KEYWORDS: gases, solutions and colloids
ALTERNATIVE FORMAT: (FR)
What properties must a substance have if it is to be collected in space S by the displacement of water?
/ Which substance may be most practically collected in space S by the displacement of water?
(A)CuCl, solid; solubility = 0.0062 g/100 g H2O,
density = 3.5 g·mL–1
(B)NO, gas; solubility = 7.3 mL/100 g H2O;
density = 1.3 g·L–1
(C)P2H4, liquid; insoluble; density = 1.01 g·mL–1
(D)Si3H8, liquid, decomposed by water;
density = 0.74 g·mL–1
(E)CO2, gas; solubility = 179.7 mL/100 g H2O;
density = 1.96 g·L–1
INDEX: M013LEVEL: (A)ANSWER: (B)
KEYWORDS: gases
ALTERNATIVE FORMAT: (SA)
Omit responses. / A gas–measuring tube, T, graduated in milliliters, contains hydrogen, G, collected over water, W, This gas occupies the space above the meniscus, M. What is the observed volume, in milliliters, for G?
(A)3.4(B)3.6(C)4.1(D)4.6
(E)5.2
INDEX: M014LEVEL: (A)ANSWER: (E)
KEYWORDS: gases, acids and bases
ALTERNATIVE FORMAT: (SA)
Gas A enters the tube, passes through the contents of B, and emerges as gas C. When the gas A is carbon monoxide and carbon dioxide and the gas C is carbon monoxide, what could be used in B? / Gas A enters the tube, passes through the contents of B, and emerges as gas C. When the gas A is a mixture of carbon monoxide and carbon dioxide and the gas C is carbon monoxide, the best substance in B would be
(A)concentrated HCl.
(B)water.
(C)phosphorous pentoxide.
(D)gasoline.
(E)sodium hydroxide solution.
INDEX: M015LEVEL: (A)ANSWER: (C)
KEYWORDS: gases
ALTERNATIVE FORMAT: (SA)
Gas A enters the tube, passes through the contents of B, and emerges as gas C. When gas A is air and water vapor and gas C is air, what should be used for the substance in B? / Gas A enters the tube, passes through the contents of B, and emerges as gas C. When gas A is a mixture of air and water vapor and gas C is air, the substance in B should be
(A)concentrated HCl.
(B)water.
(C)phosphorous pentoxide.
(D)gasoline.
(E)sodium hydroxide solution.
INDEX: M016LEVEL: (U)ANSWER: (C)
KEYWORDS: introductory concepts, gases, liquids and solids
ALTERNATIVE FORMAT: (TF)
When the atmospheric pressure in the laboratory is
752 mmHg, distilled water in an open vessel will boil . Use each response in a separate question. / When the atmospheric pressure in the laboratory is
752 mmHg, distilled water in an open vessel will boil
(A)above 100 °C.
(B)at 100 °C.
(C)at the temperature at which the vapor pressure becomes 752 mmHg.
(D)at the temperature at which the vapor pressure becomes 760 mmHg.
(E)at the temperature at which water boils in a closed vessel.
INDEX: M017LEVEL: (U)ANSWER: (C)
KEYWORDS: metals & nonmetals, oxidation and reduction
ALTERNATIVE FORMAT: (FR)
Describe a method for preparing chlorine on a small scale in the laboratory. / Chlorine is easily prepared on a small scale in the laboratory by
(A)electrolysis of fused sodium chloride.
(B)heating hydrochloric acid.
(C)treating a chloride with H2SO4 and an oxidizing agent.
(D)treating a chloride with sulfuric acid.
(E)electrolysis of hydrochloric acid.
INDEX: M018LEVEL: (A)ANSWER: (C)
KEYWORDS: gases
ALTERNATIVE FORMAT: (SA)
A 100–L sample of air is passed successively through a bottle containing concentrated sodium hydroxide solution, a tube of anhydrous calcium chloride, and a tube filled with copper wire gauze to which heat is applied. What will still be present in the residual gas? / A 100–L sample of air is passed successively through a bottle containing concentrated sodium hydroxide solution, a tube of anhydrous calcium chloride, and a tube filled with copper wire gauze to which heat is applied. Which substances will still be present in the residual gas?
(A)O2 and N2(D)CO2 and N2
(B)O2 and H2O vapor(E)N2 and Ar
(C)O3 and N2
INDEX: M019LEVEL: (A)ANSWER: (A)
KEYWORDS: gases, acids and bases
ALTERNATIVE FORMAT: (FR)
Sketch a suitable apparatus for producing a steady flow of NH3 from solid NH4Cl and solid moist Ca(OH)2. / Select the most suitable apparatus for producing a steady flow of NH3 from solid NH4Cl and solid moist Ca(OH)2.
(A)
(B)
(C)
(D)
(E)
INDEX: M020LEVEL: (A)ANSWER: (D)
KEYWORDS: gases, oxidation and reduction
ALTERNATIVE FORMAT: (FR)
Sketch a suitable apparatus for producing a steady flow of O2 from Na2O2 and water. / Select the most suitable apparatus for producing a steady flow of O2 from Na2O2 and water.
(A)
(B)
(C)
(D)
(E)
INDEX: M021LEVEL: (U)ANSWER: (C)
KEYWORDS: introductory concepts
ALTERNATIVE FORMAT: (SA)
Omit responses. / A student determines the mass of an object using a triple beam balance which is sensitive to 0.01 g. When the beam balances, the rider on one beam is in the notch marked
60 g, the rider on another beam in the notch marked 7 g, and the rider on the third beam, which is graduated by hundredths of a gram, is at zero. Considering significant figures, what mass should be recorded?
(A)67.0 g(B)76.0 g(C)67.00 g (D)76.000 g
(E)67.000 g
INDEX: M022LEVEL: (A)ANSWER: (E)
KEYWORDS: gases, electrochemistry
ALTERNATIVE FORMAT: (FR)
Sketch a suitable apparatus for producing a steady flow of O2 and H2 from dilute KOH. / Select the most suitable apparatus for producing a steady flow of O2 and H2 from dilute KOH.
(A)
(B)
(C)
(D)
(E)
INDEX: M023LEVEL: (U)ANSWER: (C)
KEYWORDS: introductory concepts
ALTERNATIVE FORMAT: (SA)
What instrument is used to measure the gain or loss of heat? / Which instrument is used to measure the gain or loss of heat?
(A)manometer(D)barometer
(B)hydrometer(E)voltmeter
(C)calorimeter
INDEX: M024LEVEL: (A)ANSWER: (B)
KEYWORDS: gases, oxidation and reduction
ALTERNATIVE FORMAT: (FR)
Sketch a suitable apparatus for producing a steady flow of CO2 from carbon and air. / Select the most suitable apparatus for producing a steady flow of CO2 from carbon and air.
(A)
(B)
(C)
(D)
(E)
INDEX: M025LEVEL: (A)ANSWER: (D)
KEYWORDS: gases, oxidation and reduction, metals & nonmetals
ALTERNATIVE FORMAT: (FR)
Sketch a suitable apparatus for producing a steady flow of H2 from dilute HCl and Fe. / Select the most suitable apparatus for producing a steady flow of H2 from dilute HCl and Fe.
(A)
(B)
(C)
(D)
(E)
INDEX: M026LEVEL: (A)ANSWER: (D)
KEYWORDS: acids and bases, solutions and colloids
ALTERNATIVE FORMAT: (FR)
Describe a method for rapidly preparing a saturated aqueous solution of KNO3 if the solubility is known. / What would be the most rapid method of preparing a saturated aqueous solution of KNO3 if the solubility is known?
(A)Add the calculated amount of solute to the proper amount of water at 20 °C and wait until all is dissolved.
(B)Add to water at 20 °C a slight excess over the calculated amount of solute and water and wait until no more solute dissolves.
(C)Dissolve less than the calculated amount of solute and let some of the water evaporate at 20 °C.
(D)Add an excess over the calculated amount of solute to hot water and cool to 20 °C, with stirring.
(E)Neutralize a dilute solution of KOH with dilute HNO3 and evaporate to the desired volume.
INDEX: M027LEVEL: (U)ANSWER: (A)
KEYWORDS: oxidation and reduction, metals & nonmetals, introductory concepts
ALTERNATIVE FORMAT: (SA)
Incandescent carbon particles cause a gas flame to be yellow. How can you obatin a hotter blue flame? / Incandescent carbon particles cause a gas flame to be yellow. To obtain a hotter blue flame you should
(A)open the air holes.
(B)close the air holes.
(C)open the needle valve at the base of the burner to increase the gas supply.
(D)partly close the supply valve at the gas jet.
(E)place a beaker of cold water over the flame to cool the flame.
INDEX: M028LEVEL: (A)ANSWER: (D)
KEYWORDS: acids and bases
ALTERNATIVE FORMAT: (FR)
The electrical conductance of a solution of Ba(OH)2 slowly decreases upon the addition of H2SO4 to a minimum, and then slowly increases. Devise an experiment to verify this. / The electrical conductance of a solution of Ba(OH)2 slowly decreases upon the addition of H2SO4 to a minimum, and then slowly increases. The best experimental evidence for this is
(A)The Ba(OH)2 solution becomes more dilute since its volume is increased by adding the H2SO4 solution.
(B)Ions are removed from the solution by the formation of water and insoluble BaSO4.
(C)The inter-ionic attraction effect is increased by adding the H2SO4.
(D)An electric lamp placed in a circuit in series with the solution becomes dim as the H2SO4 is added and then becomes bright again.
(E)An indicator placed in the solution changes color.
INDEX: M029LEVEL: (A)ANSWER: (C)
KEYWORDS: electrochemistry
ALTERNATIVE FORMAT: (FR)
The anode product in the electrolysis of solutions of hydrogen chloride depends on the concentration of the solution. What products are expected from dilute and concentrated solutions of HCl? Why? / The anode product in the electrolysis of solutions of hydrogen chloride depends on the concentration of the solution. The best experimental evidence for this is:
(A)The electrolysis of 1 M HCl between inert electrodes requires a potential of 1.3 V, while the electrolysis of
0.01 M HCl requires 1.7 V.
(B)Hydrochloric acid is completely dissociated in dilute solution.
(C)The anode product from the 1 M solution is a greenish yellow gas while that from the 0.01 M solution is a colorless, odorless gas.
(D)Two gases are formed in the electrolysis of both solutions but the greenish–yellow gas dissolves in the more dilute solution so that only the colorless gas is observed.
(E)When either of two ions may be oxidized at an anode, the one requiring the lowest potential will be oxidized and this potential depends on the concentration as well as on the relative ease of oxidation.
INDEX: M030LEVEL: (A)ANSWER: (B)
KEYWORDS: solutions and colloids
ALTERNATIVE FORMAT: (TF)
Anhydrous calcium chloride, frequently used as a drying agent for gases and liquids in the laboratory, readily deliquesces in the air. From this, you can conclude that . Use each response in a separate question. / Anhydrous calcium chloride, frequently used as a drying agent for gases and liquids in the laboratory, readily deliquesces in the air. Which conclusion can be drawn from this fact?
(A)A concentrated calcium chloride solution has a vapor pressure that is greater than the actual pressure of the water vapor in the air.
(B)A concentrated calcium chloride solution has a vapor pressure that is less than the actual pressure of the water vapor in the air.
(C)The deliquescence of calcium chloride is not related to the humidity.
(D)Calcium chloride forms a solution with evolution of heat.
(E)Calcium chloride is not very soluble in water.
INDEX: M031LEVEL: (U)ANSWER: (D)
KEYWORDS: acids and bases, gases
ALTERNATIVE FORMAT: (SA)
What drying agent would be effective for drying moist carbon dioxide gas? / Which would be most effective for drying moist carbon dioxide gas?
(A)solid calcium oxide
(B)activated charcoal
(C)a concentrated sodium hydroxide solution
(D)concentrated sulfuric acid
(E)a one-molar solution of calcium chloride
INDEX: M032LEVEL: (A)ANSWER: (C)
KEYWORDS: gases, metals & nonmetals
ALTERNATIVE FORMAT: (FR)
Devise a simple experiment to determine whether a given gas is hydrogen or oxygen. / How can you decide most easily whether a given gas is hydrogen or oxygen?
(A)Determine its solubility in water.
(B)Pass an electric spark through it.
(C)Place a piece of glowing charcoal in the gas.
(D)Determine its molar mass.
(E)Smell the gas.
INDEX: M033LEVEL: (U)ANSWER: (D)
KEYWORDS: solutions and colloids, gases
ALTERNATIVE FORMAT: (TF)
can be collected by the displacement of water from a container. Use each response in a separate question. / Which gas can be least readily collected by the displacement of water from the container?
(A)H2(B)N2(C)O2(D)NH3
(E)CO2
INDEX: M034LEVEL: (A)ANSWER: (B)
KEYWORDS: introductory concepts
ALTERNATIVE FORMAT: (SA)
Omit responses. / An object that had a mass of 5.65 g was dropped into an ordinary 10 mL graduated cylinder partially filled with water. The object was completely submerged, and the level of water present in the cylinder rose from 5.1 to 9.1 mL. Considering the precision with which the measurements were made, which value best expresses the density of the object?
(A)0.62 g·mL–1(D)4.0 g·mL–1
(B)1.4 g·mL–1(E)14.1 g·mL–1
(C)1.41 g·mL–1
INDEX: M035LEVEL: (A)ANSWER: (D)
KEYWORDS:
ALTERNATIVE FORMATS: (FR)
How might you determine experimentally whether the compound MCl3 is ionic or covalent? / To determine experimentally whether the compound MCl3 is ionic or covalent, one might
(A)test the solubility in water.
(B)determine the percentage composition.
(C)find the valence of M.
(D)test the electrical conductivity in the fused state.
(E)determine whether the compound has an electrical charge.
INDEX: M036LEVEL: (A)ANSWER: (E)
KEYWORDS: gases, solutions and colloids, equilibrium
ALTERNATIVE FORMATS: (TF)
A manometer (A) is attached to a cylinder (B) fitted with a movable piston (C). The manometer shows a pressure of 23.5 mmHg when 2.0 g of liquid water (D) are in equilibrium with water vapor at 25 °C. A permanent decrease in the pressure would result from . Use each response in a separate question. / A manometer (A) is attached to a cylinder (B) fitted with a movable piston (C). The manometer shows a pressure of 23.5 mmHg when 2.0 g of liquid water (D) are in equilibrium with water vapor at 25 °C. Which would cause a permanent decrease in the pressure?
(A)moving the piston upward a short distance
(B)moving the piston downward a short distance
(C)removing a small amount of the water vapor
(D)removing half of the liquid water
(E)dissolving salt in the water
INDEX: M037LEVEL: (A)ANSWER: (B)
KEYWORDS: acids and bases
ALTERNATIVE FORMAT: (FR)
The addition of dilute hydrochloric acid to a white powder that was known to be pure NaHSO3 or NaHSO4 or NaHCO3 produced a gas with a sharp, choking odor. Identify both the original solid and the gas produced. Write an equation for the observed reaction. / The addition of dilute hydrochloric acid to a white powder that was known to be pure NaHSO3 or NaHSO4 or NaHCO3 produced a gas with a sharp, choking odor. The original solid and the gas formed were, respectively,
(A)NaHCO3 and CO2(C)NaHSO4 and SO3
(B)NaHSO3 and SO2(D)NaHSO3 and SO3
INDEX: M038LEVEL: (U)ANSWER: (D)
KEYWORDS: acids and bases, coordination chemistry, solutions and colloids
ALTERNATIVE FORMAT: (TF)