Final Review 2 PDF

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Practice Problems with answers for class final. ...

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Final Exam Review chem 1405 1.. How many liters are in 14.7 fluid ounces of a soft drink? (1 fl oz = 28.35 mL) A) 5.19 10–4 L B) 5.19 102 L C) 4.17 105 L D) 4.17 102 L E) 0.417 L 2. Convert: 38.6 L = _____________ mL. a. mL b. mL c. mL d. mL e. 3.86 mL 3. Convert: 6.0 mm = _____________ km. a. km b. km c. km d. km e. km 4. The melting point of a solid is 39°F. This corresponds to A) 295 K. B) 312 K. C) 286 K. D) 277 K. E) 312 K. 5. The boiling point of chlorine is 172 K. This temperature corresponds to A) –82°C. B) 101°C. C) 172°C. D) –172°C. E) –101°C. 6. The melting point of a certain solid is –25°C. This corresponds to A) 13°F. B) –32°F. C) –13°F. D) –103°F. E) 18°F. 7. Express 1840000 in scientific notation A.18.4×10-8 B.1.84×10-6 C.184×106 D.184×104 E.5.84×107

8. Using the rules of significant figures calculate the following 12.67+13.005 A. 25.675 B. 25 C.20 D. 25.68 E.26 9

9.

The figure below represents the bull’s eye target for an archer. The black dots represent where the archer’s arrows hit:

How can this archer be described? A) B) C) D) E)

precise but not accurate accurate and precise neither accurate nor precise accurate but not precise cannot be described from the data presented

11. A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.71 g/mL, 1.73 g/mL, 1.67 g/mL, 1.69 g/mL. If the actual value for the density of the sugar solution is 1.40 g/mL, which statement below best describes her results? A) Her results are precise, but not accurate. B) Her results are accurate, but not precise. C) Her results are both precise and accurate D) Her results are neither precise nor accurate. E) It isn't possible to determine with the information given. 10. The number of protons in is a. 80 b. 120 c. 200 d. dependent on ionic charge e. unknown 11. How many protons are there in an atom of a. b. c. d. e.

92 237 145 329 Cannot tell from information given

?

12. An atom with 45 protons has a mass number of 100. It must contain how many neutrons? a. 145 b. 45 c. 100 d. 55 e. none of these 13. Which of the following is a nonmetal? a. cerium b. cesium c. carbon d. calcium e. copper 2+ 14. The name for is a. mercury(I) ion b. mercury ion c. mercury(II) ion d. hydrogen ion e. hydrogen(II) ion 15. a. b. c. d. e. 16.

The correct name for FeO is iron oxide iron(II) oxide iron(III) oxide iron monoxide iron(I) oxide Choose the correct Lewis structure for the OH- ion.

a. b. c. d.

17. A) B) C) D) E)

Which of the following molecules has a nonlinear structure? XeF2 BeCl2 O3 CO2 N2O (central atom is N)

ANS: C

18.

The Lewis structure for H3BO3 is A)

B)

C)

D)

E)

ANS: D 19. a. b. c. d. e.

Arrange the following elements in order of increasing electronegativity (from smallest to largest). Li < C < N < F C < N < F < Li N < C < Li < F C < F < Li < N F < N < C < Li

ANS: A 20. 1s22s22p63s23p6 is the electron configuration for which one of the following ions? 2a. S b. Ca+ c. Na+ d. Fe. none of these ANS: A 21. Refer to the following unbalanced equation: What mass of oxygen (O2) is required to react completely with 11.7 g of C6H14? a. g b. 20.6 g c. 4.34 g d. 41.3 g e. 0.136 g ANS: D

22. Refer to the following equation: How many moles of ammonia will be required to produce 11.9 mol of water? a. 4.76 mol b. 11.9 mol c. 7.93 mol d. 5.95 mol e. none of these ANS: C 23.

Refer to the following equation:

How many molecules of NO2 are produced when 5.38 mol of ammonia is completely reacted? a. 21.52 b. c. d. 247 e. none of these ANS: C 24.

A 3.1-mol sample of KClO3 was decomposed according to the equation

How many moles of O2 are formed assuming 100% yield? a. 2.1 mol b. 2.6 mol c. 3.1 mol d. 1.6 mol e. 4.7 mol ANS: E 25.

For the reaction

if 5.42 g of S is reacted with 10.0 g of O2, how many grams of SO3 will be produced? a. 27.1 g b. 6.77 g c. 16.7 g d. 13.5 g e. none of these ANS: D 26. Consider the following unbalanced equation: How many moles of water are needed to react with 206. g of Al4C3? a. 1.43 mol b. 0.119 mol c. 0.699 mol d. 309. mol e. 17.2 mol ANS: E

27. a. b. c. d. e.

Calculate the percentage composition (by mass) of Mg in Mg3(AsO4)2. 20.8 % 34.4 % 36.3 % 6.9 % 22.9 %

ANS: A 28. A gaseous compound containing carbon and hydrogen was analyzed and found to consist of 83.65% carbon by mass. What is the empirical formula of the compound? a. CH2 b. CH3 c. C7H16 d. CH e. C3H7 ANS: E 29. a. b. c. d. e.

Solid calcium hydroxide is dissolved in water until the pH of the solution is 10.39. The hydroxide ion concentration [OH–] of the solution is −11 4.1  10 M 3.61 M −4 2.5  10 M −16 9.6  10 M none of these

ANS: C 30. A solution has [H+] = 5.0 a. 6.70 b. 5.98 c. 7.30 d. 9.77 e. none of these

10–8 M. The pH of this solution is

ANS: C 31. Calculate the [H+] in a solution that has a pH of 9.16. a. 6.9  10−10 M b. 1.4  10−5 M c. 4.84 M d. 9.16 M e. none of these ANS: A 32. A solution has [H+] = 4.3 a. 7.37 b. 6.63 c. 9.37 d. 3.28 e. none of these ANS: B

10–8 M. The pOH of this solution is

33. a. b. c. d. e.

A solution has [OH–] = 3.0 1.0 M 7 3.0  10 M −7 1.0  10 M −8 3.3  10 M none of these

10–7 M. The [H+] in this solution is

ANS: D 34. a. b. c. d. e.

Calculate the [H+] in a solution that has a pH of 8.82. 8 6.6  10 M 5 1.5  10 M −7 1.0  10 M −9 1.5  10 M none of these

ANS: D 35. a. b. c. d. e.

Determine the pressure exerted by 2.26 mol of gas in a 2.92-L container at 32°C. 2.03 atm 56.6 atm 19.4 atm 5.93 atm 17.3 atm

ANS: C 36. A gas occupies 32.6 L at 2.00 atm pressure and 27°C. Calculate its volume if the pressure remains at 2.0 atm but the temperature is raised to 54°C. a. b. c. d. e.

29.9 L 65.2 L 0.0281 L 35.5 L 23.8 L

ANS: D 37. A sample of oxygen gas (O2) has a volume of 7.08 L at a temperature of 19oC and a pressure of 1.38 atm. Calculate the moles of O2 molecules present in this gas sample. a. b. c. d. e.

6.27 mol 0.408 mol 0.816 mol 0.204 mol none of these

ANS: B

38. A gas occupies 42.6 L at 2.00 atm pressure and 27°C. Calculate its volume if the pressure is decreased to 1.00 atm at constant temperature. a. 21.3 L b. 85.2 L c. 128 L d. 28.5 L e. 179 L ANS: B 39. A 12.0-g sample of helium gas occupies a volume of 14.4 L at a certain temperature and pressure. What volume does a 24.0-g sample of neon occupy at these conditions of temperature and pressure? a. 5.71 L b. 28.8 L c. 22.4 L d. 36.3 L e. 11.4 L ANS: A 40. Which of the following is not a conjugate acid-base pair? a. b. c. d. e.

H2SO4, SO42– HNO3, NO3– HC2H3O2, C2H3O2– H2PO4–, HPO42– HBr, Br–

ANS: A...