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Instruction: Read each questions carefully. Encircle the letter of the correct answer. The reaction between solid white phosphorus (P 4 ) and oxygen produces solid tetraphosphorus decoxide (P 4 O 10 ). This compound is often called diphosphorus pentoxide because its empirical formula is P 2 O 5.
- How much P 4 O 10 , in g, if 25.0 g of P 4 and 50.0 g of oxygen are combined? A. 57.30 g P 4 O 10 B. 5.730 g P 4 O 10 C. 573.00 g P 4 O 10 D. 0.5730 g P 4 O 10
- Which of the following equations is the correct balanced equation of the problem? A. 4P + 10O โ P 4 O 10 B. 4P 2 + 5O 2 โ 2P 4 O 10 C. P 4 + 5O 2 โ P 4 O 10 D. P + O โ P 4 O 10
- What compound is the limiting reactant? A. P 4 B. O 2 C. P 4 O 10 D. P 2 O 5
- How much, in grams, is the excess of the excess reactant? A. 50.0 g B. 32.3 g C. 25.0 g D. 17.7 g
- How much, in moles, is the consumed amount of the excess reactant? A. 1.000 mole B. 1.010 moles C. 0.202 moles D. 1.560 moles
- Which diagram best represents the ions remaining in solution after stoichiometric amounts of aqueous barium hydroxide and hydrobromic acid are combined? A. I B. II C. III D. IV
- There is a definite correlation between orderliness and level of safety in the laboratory. In addition, a disorderly laboratory can hinder or endanger emergency response personnel. Which of the following housekeeping rules should not be adhered to? A. Never obstruct access to exits and emergency equipment B. Properly label and store all chemicals C. Secure all compressed gas cylinders to walls or benches D. Store chemical containers on the floor
- All containers or laboratory glassware having chemicals in them should be properly labeled. When should you place a label on a container? A. After adding the chemical B. Before adding the chemical C. During the adding of the chemical D. After the container is used.
- Flammable liquids burn only when their vapor is mixed with air in the appropriate concentration. When handling flammable liquids you should. A. Use adequately ventilated areas B. Avoid nearby sources of ignition C. Ground metal lines and vessels D. All of the above.
A. 6 moles B. 10 moles C. 3 moles D. 5 moles
- Determine the oxidation number of sulfur in each of the following species: H 2 S, HSO 3 - , SCl 2 , S 8. A. +2, +6, -2, + B. -2, +3, +2, 0 C. -2, +5, +2, -1/ D. -2, +4, +2, 0
- Which of the following correctly represents the balanced chemical reaction between aluminum and sulfur? A. 8 Al + S 8 โ 8AlS B. 4 Al + S 8 โ 4AlS 2
C. 12 Al + S 8 โ 4Al 3 S 2
D. 16 Al + 3 S 8 โ 8 Al 2 S 3
- Why is the number of protons used to determine the identity of the element. A. Because it is found in the nucleus B. Because it can neither be gained nor lost C. Because it decides the mass of the element D. Because it is the atomic number
- What volume of 12.0 M HCl must be used to prepare 250.0 mL of 0.125 M HCl? A. 2.50 mL B. 2.60 mL C. 2.70 mL D. 2.80 mL
- The diagram represents the concentrated stock solution and dilute solution. How many milliliters of the conentrated stock solution are needed to prepare solutions of the same concentration as the dilute solution of each of the following final volumes? (a) 80 ml, (b) 160 ml, (c) 300 ml
A. 640 ml, 1280 ml, 2400 ml B. 0.1 ml, 0.05 ml, 0.027 ml C. 10 ml, 12.5 ml, 37.5 ml D. 0.9 ml, 0.45 ml, 0.24 ml
- How many moles of Calcium are there in 402.96 g of Ca? A. 15.00 moles B. 10.17 moles C. 10.05 moles D. 5 moles
- How many Calcium atoms are there in 402.96 g of Ca? A. 6.0125 x 10^22 B. 6.0231 x 10^23 C. 6.0521 x 10^24 D. 6.0251 x 10^25
- Sulfur (S) is a nonmetallic element that is present in coal. When coal is burned, sulfur is converted to sulfur dioxide and eventually to sulfuric acid that gives rise to the acid rain phenomenon. How many atoms are in 52.100 g of S? A. 8.7931 x 10^22 B. 1.0040 x 10^27 C. 2.7685 x 10- D. 9.7832 x 10^23
- Calcium carbonate (CaCO 3 ) is naturally found in forms of chalk, limestones, and marble. It is also used as a dietary supplement. Calculate the percentage composition by mass of Ca, C, and O in this compound. A. Ca = 50%, C = 10%, O = 40% B. Ca = 40%, C = 12%, O = 48% C. Ca = 44%, C = 11%, O = 55% D. Ca = 48%, C = 22%, O = 30%
- Vitamin C, also known as ascorbic acid, helps protect cells and keeping them healthy. Lack of vitamin C can lead to scurvy. It is composed of 40.92% carbon, 4.58% hydrogen, and 54.50% oxygen by mass. Determine its empirical formula. A. C 3 H 4 O 3 B. CHO C. C 2 H 5 O D. C 3 H 3 O 3
2Al + Fe 2 O 3 โAl 2 O 3 + 2Fe In one process, 124 g of Al are reacted with 601 g of Fe 2 O 3.
- Which of the substances is the limiting reactant? A. Al B. Fe 2 O 3 C. Al 2 O 3 D. Fe
- How many grams of Al 2 O 3 are produced? A. 938.4 g Al 2 O 3 B. 0.0901 g Al 2 O 3 C. 234.6 g Al 2 O 3 D. 11.08 g Al 2 O 3
- How much, in g and moles, of the excess reactant is left at the end of the reaction? A. 367.29 g, 2.3 moles B. 233.71 g, 1.46 moles C. 601 g, 3.76 moles D. There is no excess reactant
- How many grams of Fe are produced? A. 1027.55 g Fe B. 256.89 g Fe C. 128.44 g Fe D. 513.77 g Fe
- How many grams of Al and Fe 2 O 3 are used up? A. All the Al and Fe 2 O 3 are used up B. All Fe 2 O 3 and 85% of Al are used up C. 61% Fe 2 O 3 and 51% Al are used up D. All of Al and 61% Fe 2 O 3 are used up.
- The density of copper is 8.94 g/cm^3 at 20ยฐC and 8.91 g/cm^3 at 60ยฐC. This density decrease is the result of which of the following? A. The metal expands B. The metal contracts C. The mass of the metal increases D. The mass of the metal decreases
- How many significant figures are there in 1.310 x 10^22? A. 3 B. 2 C. 4 D. 5
- The surface area and average depth of the Pacific Ocean are 1.8 x 10^8 km^2 and 3.9 x 10^3 m, respectively. Calculate the volume of water in the ocean in liters. A. 7.02 x 10^11 L B. 7.02 x 10^14 L C. 7.02 x 10^17 L D. 7.02 x 10^20 L
- Who discovered the electron? A. Rutherford B. J.J. Thomson C. Chadwick D. Bohr
- Which of the following is a characteristic of an anion? A. Positive net charge B. Readily loses electrons C. Zero net charge D. Readily gains electrons
- The modern periodic table is arranged in order of increasing atomic ______. A. Mass B. Charge C. Number D. Radius
- To what category of elements does an element belong if it is a poor conductor of heat and electricity? A. Transition metals B. Metals C. Nonmetals D. Metalloids
- Which of the following elements has the largest ionization energy?
A. Chalcogen group B. Alkaline earth metal C. Noble gas D. Group V Titanium is a strong, lightweight, corrosion-resistant metal that is used in rockets, aircraft, jet engines, and bicycle frames. It is prepared by the reaction of titanium (IV) chloride with molten magnesium between 950 โ and 1150 โ: TiCl 4 (g) + 2Mg (l) โ Ti (s) + 2MgCl 2 (l) In a certain industrial operation 3.54 x 10^7 g of TiCl 4 are reacted with 1.13 x 10^7 g of Mg.
- How much is the theoretical yield, in g, of Ti? A. 7.91 x 10^6 g Ti B. 8.95 x 10^6 g Ti C. 9.25 x 10^6 g Ti D. 9.88 x 10^6 g Ti
- How much is the percent yield if 7.91 x 106 g of Ti are actually obtained? A. 88.4 % B. 85.51% C. 100% D. 80.06%
- How much of Ti, in g, should be obtained to have 94.97% yield? A. 8.30 x 10^6 g Ti B. 8.20 x 10^6 g Ti C. 8.50 x 10^6 g Ti D. 8.40 x 10^6 g Ti 51-70. Laboratory Exam (20 points):
Predict the precipitate that will be formed from the ions in the simulator. Write the molecular equation of the reaction, the ionic equation, and net ionic equation. Specify which precipitate will be formed, the spectator ions, and the color of the precipitate.
