# Notes

Topics: Atom, Chemistry, Pressure Pages: 19 (5379 words) Published: November 2, 2012
Practice Final Exam Version 2 Name___________________________________

Chemistry 201 (Eikey)

Part 1: MULTIPLE CHOICE (48 points). Choose the one alternative that best completes the statement or answers the question. Record your answer on the scantron. Each question is worth 3 points. 1) A student weighed 30.00 µg of sulfur in the lab. This is the same mass as A) 3.000 × 10 4 ng. B) 3.000 × 10 -5 mg. C) 3.000 × 10 -8 g. D) 3.000 × 10 -5 kg. 2) 1)

2) A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.79 g/mL, 1.81 g/mL, 1.80 g/mL, 1.81 g/mL. If the actual value for the density of the sugar solution is 1.80 g/mL, which statement below best describes her results? A) Her results are neither precise nor accurate. B) Her results are precise, but not accurate. C) Her results are accurate, but not precise. D) Her results are both precise and accurate E) It isn't possible to determine with the information given. 3) A person weighs 77.1 kg. What is his weight in pounds? A) 35.0 pounds B) 154 pounds C) 170 pounds

3) D) 162 pounds 4)

4) The density of air under ordinary conditions at 25°C is 1.19 g/L. How many kilograms of air are in a room that measures 11.0 ft × 11.0 ft and has an 10.0 ft ceiling? 1 in. = 2.54 cm (exactly); 1 L = 103 cm3 A) 0.152 B) 0.0962 C) 40.8 D) 4.08 × 104 E) 3.66

5) Which of the following are examples of intensive properties? A) volume B) density C) mass D) None of the above are examples of intensive properties. E) All of the above are examples of intensive properties. 6) Write the formula for strontium nitride. A) Sr(NO2)2 B) Sr(NO3)2 C) Sr3N2 D) SrN E) Sr2N3

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7) What species is represented by the following information? p+ = 17 A) Cl n° = 18 e- = 18 B) Kr C) Ar+ D) ClE) Ar

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8) Write the name for Sn(SO4)2. A) tin (II) sulﬁte B) tin (IV) sulfate C) tin (I) sulﬁte D) tin sulﬁde E) tin (I) sulfate 9) Write the name for Ca3(PO4)2. A) tricalcium phosphorustetraoxide B) calcium (II) phosphite C) calcium (III) phosphite D) calcium phosphite E) calcium phosphate 10) Give the formula for sulfurous acid. A) H2SO4 B) HSO 4 11) The ion, IO2-, is named A) iodate ion. C) iodine(II) oxide ion. B) iodite ion. D) iodine dioxide ion.

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10) C) H2SO3 D) HSO 3 11)

12) What mass of phosphorus pentaﬂuoride, PF 5, has the same number of ﬂuorine atoms as 25.0 g of oxygen diﬂuoride, OF 2? A) 0.933 g B) 146 g C) 23.3 g D) 10.0 g 13) How many millimoles of Ca(NO 3)2 contain 4.78 × 10 22 formula units of Ca(NO3)2? The molar mass of Ca(NO3)2 is 164.10 g/mol. A) 79.4 mmol Ca(NO3)2 B) 12.6 mmol Ca(NO3)2 C) 57.0 mmol Ca(NO3)2 D) 13.0 mmol Ca(NO3)2 E) 20.7 mmol Ca(NO3)2 14) Determine the molecular formula of a compound that is 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen. The molecular weight is 194.19 g/mol. A) C8H10N4O2 B) C4H5N2O C) C8H10N2O D) C8H12N4O2

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15) Combustion analysis of 63.8 mg of a C, H and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound? A) C5H2O B) C3H6O C) C3H7O D) CHO E) C6HO3

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16) In an acid-base neutralization reaction 38.74 mL of 0.500 M potassium hydroxide reacts with 50.00 mL of sulfuric acid solution. What is the concentration of the H2SO4 solution? A) 0.194 M B) 0.775 M C) 0.387 M D) 1.29 M

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17) When 31.2 mL of 0.500 M AgNO3 is added to 25.0 mL of 0.300 M NH4Cl, how many grams of AgCl are formed? AgNO 3(aq) + NH4Cl(aq) → AgCl(s) + NH4NO3(aq) A) 2.24 g B) 1.07 g C) 3.31 g D) 6.44 g 18) A 12.39 g sample of phosphorus reacts with 42.54 g of chlorine to form only phosphorus trichloride (PCl3). If it is the only product, what mass of PCl3 is formed? A) 30.15 g B) 54.93 g C) 79.71 g D) 91.86 g E) 140.01 g

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19) How many molecules of sucrose (C12H22O11, molar mass = 342.30 g/mol) are contained in 14.3 mL of 0.140 M sucrose solution? A) 8.29 × 10 22...

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