CHEM 100 Sample Test 3
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1 CHEM 100 Sample Test 3 1. What ion is likely to be formed by Calcium(Ca) in chemical reactions? a) Ca 2+ b) Ca 4+ c) Ca 1+ d) Ca 3+ e) Ca 2-2. An atom is in the VIA group of the periodic table. This atom is most likely to a) form a 3+ ion. b) not conduct heat or electricity. c) form a 3- ion. d) have an oxide of formula RO. e) be a nonmetal. 3. In order to form positive ions from neutral atoms the following usually happens a) electrons must be gained. b) electrons must be lost. c) protons must be gained. d) protons must be lost. e) neutrons must change. 4. The correct formula for aluminum phosphate is a) Al 2 SO 3 b) AlPO 4 c) Al 2 (PO 4 ) 3 d) Al 3 (PO 4 ) 2 e) Al 2 SO Molecular Compounds 5. The formula CH 3 CH 2 CH 2 OH is an example of a(n): a. inorganic formula b. ball and stick model c. condensed formula d. structural formula e. functional group formula 6. The chemical compound C 6 H 4 (COOH) 2 can also be represented as: a. C 7 H 6 O 2 b. C 7 H 5 O 2 c. C 7 H 5 O 4 d. C 8 H 6 O 2 e. C 8 H 6 O 4 7. Which compound is not organic? a. C 2 H 6 O b. C 6 H 12 O 6 c. C 4 H 10 d. NH 4 NO 3 e. C 6 H 5 OH SAMPLE TEST CHAPTER Select the molecular formula for a compound that contains 10 carbon atoms, 17 hydrogen atoms, 3 nitrogen atoms, 6 oxygen atoms and 1 sulfur atom. a. C 10 H 17 N 3 O 6 S b. Ca 10 H 17 N 3 O 6 Se c. Cl 10 He 17 Ni 3 O 6 S d. C 10 H 17 N 3 O 6 Sn e. Cu 10 H 17 N 3 O 6 S 3.2 Naming Binary Molecular Compounds 9. Which of the following number and prefix combinations is incorrect? b. 3 tri c. 5 penta d. 6 hepta e. 2 di f. 8 octa 10. Which of the following is not a binary compound? a. H 2 O b. CH 4 c. HCl d. LiF e. CH 3 OH 11. Which formula name combination is incorrect? a. SeCl 4 selenium trifluoride b. N 2 O 3 dinitrogen trioxide c. P 4 O 10 tetraphosphorus decaoxide d. AsF 5 arsenic pentafluoride e. SF 6 sulfur hexafluoride 12. Which formula name combination is incorrect? a. CS 2 carbon disulfide b. SO 2 sulfur dioxide c. P 2 O 3 diphosphorus trioxide d. CCl 4 carbon butachloride e. SCl 2 sulfur dichloride 3.3 Hydrocarbons and Alcohols 13. Which compound is not a hydrocarbon? a. CH 4 b. CH 3 OH c. C 2 H 6 d. C 2 H 2
2 e. C 6 H Which compound is an alcohol? a. CH 4 b. CH 3 NH 2 c. C 2 H 6 d. CH 3 OCH 3 e. C 6 H 5 OH 15. Which compound is incorrectly named? a. C 2 H 6 ethane b. C 6 H 14 hexane c. C 5 H 12 pentane d. C 8 H 18 octane e. C 3 H 8 butane 16. What is the correct general formula for an alkane? a. C n H 2n b. C n H 2n+2 c. C n H 2n-2 d. C n H n+2 e. C n H n 17. Which alkane will have the highest boiling point? a. butane b. ethane c. decane d. hexane e. octane 18. Which compound will have the highest boiling point? a. ethane b. ethanol c. propanol d. pentanol e. pentane 3.4 Alkanes and Their Isomers 19. Which of the following are constitutional isomers? a. C 2 H 5 OH and CH 3 OCH 3 b. C 2 H 4 and C 2 H 6 c. C 6 H 5 OH and C 6 H 4 (OH) 2 d. CH 2 O and C 6 H 12 O 6 e. C 3 H 8 and CH 3 CH 2 CH Which statement about constitutional isomers is true? a. Constitutional isomers have the same chemical properties. b. Constitutional isomers only occur among straight chain compounds. 27 c. Constitutional isomers have different physical properties. d. Constitutional isomers always contain identical functional groups. e. Constitutional isomers have different molecular formulas. 21. The compound 2,2,3,4-tetramethylpentane is an isomer of: a. hexane b. heptane c. octane d. nonane e. decane 3.5 Ions and Ionic Compounds 22. Find the correct combination of protons and electrons below for the magnesium ion. a. 12 protons and 10 electrons b. 12 protons and 12 electrons c. 12 protons and 14 electrons d. 24 protons and 24 electrons e. 24 protons and 22 electrons 23. Find the correct combination of protons and electrons below for the oxide ion. a. 8 protons and 8 electrons b. 16 protons and 18 electrons c. 8 protons and 10 electrons d. 8 protons and 6 electrons e. 16 protons and 16 electrons 24. Which combination below corresponds to a cation with a +2 charge? a. 7 protons and 8 electrons b. 11 protons and 10 electrons c. 18 protons and 18 electrons d. 17 protons and 18 electrons e. 20 protons and 18 electrons 25. Which combination below corresponds to the hydrogen ion? a. 1 proton and 0 electrons b. 2 protons and 1 electron c. 1 proton and 2 electrons d. 2 protons and 3 electrons e. 1 proton and 1 electron 26. Which of the following is not an ionic compound? a. MgCl 2 b. H 2 S c. NaF d. AlCl 3 e. CaO 27. Which of the following is not an ionic
3 compound? a. CuCl 2 b. CuO c. KBr d. NH 3 e. BaCl Give the formula for the ionic compound that forms between calcium and oxygen. a. CaO b. Ca 2 O c. CaO 2 d. Ca 2 O 3 e. Ca 3 O Give the formula for the ionic compound that forms between strontium and fluorine. a. SrF b. SrF 2 c. Sr 2 F d. Sr 2 F 3 e. Sr 2 F Give the formula for the ionic compound that forms between magnesium and nitrogen. a. MgN b. Mg 2 N c. Mg 3 N d. MgN 2 e. Mg 3 N Give the formula for the ionic compound that forms between aluminum and chlorine. a. AlCl b. AlCl 2 c. AlCl 3 d. Al 2 Cl e. Al 3 Cl 3.6 Naming Ions and Ionic Compounds 32. Which ion is incorrectly named? 33. a. K + potassium ion b. Cr 4+ chromium(iv) ion c. Ba 2+ barium ion d. Al 3+ aluminum(iii) ion e. Ni 2+ nickel(ii) ion 33. Which compound is incorrectly named? a. NaF sodium fluoride b. MgBr 2 magnesium bromide c. CaO calcium oxide d. CuO copper monoxide 28 e. TiCl 4 titanium(iv) chloride 34. Which compound is incorrectly named? a. MgO magnesium(ii) oxide b. Fe 2 O 3 iron(iii) oxide c. CsCl 2 cesium chloride d. K 2 S potassium sulfide e. NaN 3 sodium nitride 35. Which compound is incorrectly named? a. Ba(OH) 2 barium hydroxide b. Na 2 SO 4 sodium sulfite c. Fe(OH) 3 iron(iii) hydroxide d. NH 4 NO 3 ammonium nitrate e. K 2 Cr 2 O 7 potassium dichromate 36. Which compound is incorrectly named? a. CaHPO 4 calcium hydrogen phosphate b. Cr(NO 3 ) 3 chromium nitrite c. MgCO 3 magnesium carbonate d. NaH sodium hydride e. CuOH copper(i) hydroxide 3.7 Properties of Ionic Compounds 37. Which of the following is not a typical property of ionic compounds? a. high melting point b. high boiling point c. solid d. conducts electricity as a solid e. consists of anions and cations in a crystal lattice 38. Which statement concerning ionic compounds is incorrect? a. Ionic solids are crystalline. b. Cations are immediately surrounded by positively charged particles. c. Ionic compounds cleave along planes rather than shatter like glass. d. Ionic compounds are good conductors when dissolved in water. e. Ionic compounds produce aqueous ions when dissolved in water. 39. Which ionic compound is expected to have the highest melting point? a. NaCl b. BaO c. MgCl 2 d. AlN e. K 2 S 3.8 Moles of Compounds
4 40. A combustion reaction produces 24.7 g of CO 2. Determine the number of moles of carbon dioxide present. a moles b moles c moles d moles e moles 41. How many grams of sugar, C 12 H 22 O 11, are present in moles of sugar? a X 10 3 g b g c X 10-3 g d g e. 171 g 42. A sample contains 52.0 g of elemental phosphorus, P 4. Determine the number of moles and the number of atoms of phosphorus present in the sample. a moles, 4.04 X atoms b moles, 2.79 X atoms c moles, 1.01 X atoms d moles, 1.01 X atoms e moles, 2.52 X atoms 43. Determine the number of molecules in a drop of water that has a mass of g. a X molecules b X molecules c X molecules d X molecules e X molecules 44. Determine the number of molecules in 125 mg of caffeine, C 8 H 10 N 4 O 2. a X b X c X d X e X Percent Composition 45. Determine the percent platinum in cisplatin, PtCl 2 (NH 3 ) 2. a. 65.0% b. 23.6% c % d. 78.9% e. 58.5% 46. Determine the percent water present in epsom salt, MgSO 4 7H 2 O. a. 51.2% b. 7.31% c. 9.86% d. 13.0% e. 87.0% 47. Determine the percent chlorine in the polychlorinated biphenyl having the formula C 12 H 4 Cl 6. a. 19.3% b. 51.1% c. 39.9% d. 58.9% e. 48.9% 48. Determine the percent copper present in CuSO 4. a. 20.1% b. 39.8% c. 40.1% d. 57.0% e. 14.3% 3.10 Determining Empirical and Molecular Formulas 49. A carbon compound has an empirical formula of CH 2 O and had an approximate molecular weight of 117. What is its molecular formula? a. C 4 H 4 O 4 b. C 8 H 4 O 8 c. C 4 H 8 O 4 d. C 3.9 H 7.8 O 3.9 e. C 3.9 H 3.9 O A carbon compound has an empirical formula of C 2 H 3 O and had an approximate molecular weight of 172. What is its molecular formula? a. C 2 H 3 O b. C 4 H 6 O 2 c. C 6 H 8 O 3 d. C 8 H 12 O 4 e. C 10 H 14 O Xenon hexafluoride solid, XeF 6, is a polymeric species with the formula (XeF 6 ) x. Its molecular weight is 972. What 29
5 is the value of x? a. 2 b. 3 c. 4 d. 5 e A hydrocarbon contains 85.7% carbon and the remainder hydrogen. Determine the empirical formula of the compound. a. CH b. CH 2 c. CH 3 d. C 2 H e. C 2 H A hydrocarbon contains 82.7% carbon and the remainder hydrogen. Determine the empirical formula of the compound. a. C 2 H 5 b. C 2 H 6 c. C 3 H 8 d. C 4 H 10 e. C 4 H A hydrocarbon contains 49.3% carbon, 6.9% hydrogen and the remainder oxygen. Determine the empirical formula of the compound. a. CH 2 O b. C 3 H 2 O c. C 3 H 5 O 2 d. C 3 H 5 O e. C 6 H 10 O A hydrocarbon contains 40.0% carbon, 6.66% hydrogen and the remainder oxygen. It has a molecular weight of 180. Determine the molecular formula of the compound. a. C 3 H 6 O 3 b. C 4 H 8 O 2 c. C 6 H 12 O 6 d. C 5 H 12 O 5 e. C 2 H 6 O A compound is composed of 56.4% phosphorus and the remainder oxygen. Determine the empirical formula of the 30 compound. a. P 2 O b. P 2 O 5 c. P 2 O 3 d. PO 5 e. P 3 O The hydrate of copper sulfate, CuSO 4 H 2 O loses 36.1% of its mass upon heating. The mass loss can be considered to be only water. What is the value of n? a. 2 b. 3 c. 4 d. 5 e When 2.34 g of pure iron is allowed to react with an excess of chlorine, 6.78 g of the final compound is produced. Determine the formula of the compound. a. Fe 2 Cl 3 b. FeCl c. FeCl 2 d. FeCl 3 e. FeCl The Biological Periodic Table 59. Which element is least abundant in the human body? a. iron b. oxygen c. carbon d. hydrogen e. nitrogen 3.12 Biomolecules: Carbohydrates and Fats 60. Which of the following statements about carbohydrates is false? a. Monosaccharides important to human blood chemistry contain six carbons. b. A disaccharide is two monsaccharides linked together. c. Simple sugars are either mono- or disaccharides. d. Artificial sweetners are always some form of a saccharide. e. Up to several thousand monosaccharides can link together to form a polysaccharide. 61. Which statement about fats is false? a. Fats are a form of stored energy. b. Fats contain approximately twice as much energy per gram as carbohydrates.
6 c. Fatty acids contain the carboxylic acid functional group. d. Nutritionists recommend that fat in the diet be limited to no more than 30% of a person's daily caloric intake. e. Fats contain five long hydrocarbon chains. Answers: 1. a. Ca e. be a nonmetal. 3. b. electrons must be lost 4. b. AlPO 4 5. c 6. e 7. d 8. a 9. c 10. e 11. a 12. d 13. b 14. e 15. e 16. b 17. c 18. d 19. a 20. c 21. d 22. a 23. c 24. e 25. a 26. b 27. d 28. a 29. b 30. e 31. c 32. d 33. d 34. a 35. b 36. b 37. d 38. b 39. d 40. c 41. e 42. d 43. b 44. e 45. a 46. e 47. d 48. b 49. c 50. d 51. c 52. b 53. a 54. c 55. c 56. c 57. d 58. d 59. a 60. d 61. e 31
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