DO NOT OPEN THE EXAMINATION PAPER UNTIL YOU ARE TOLD BY THE SUPERVISOR TO BEGIN CHEMISTRY 2202 SAMPLE FINAL EXAMINATION.

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1 Name: Teacher: DO NOT OPEN TE EXAMINATION PAPER UNTIL YOU ARE TOLD BY TE SUPERVISOR TO BEGIN EMISTRY 2202 SAMPLE FINAL EXAMINATION Value: 100% General Instructions This examination consists of two parts. Both parts are contained in this booklet and further general instructions are provided on appropriate pages. Part I - Multiple hoice (40%) Select the letter of the correct response from those provided. EITER shade the letter on your computer scorable card OR place the letter in the blank provided on your Multiple hoice Answer Sheet, whichever format is being used by your school for this exam. Do ALL questions in this section. Part II - onstructed Response (60%) Answer ALL questions fully and concisely in the space provided. Show all work, and use correct units and significant digits in all final answers. A Periodic Table and a hemistry Data Sheet are provided. Student hecklist The items below are your responsibility. Please ensure that they are completed. Write your name and teacher's name on the top of this page. Write your name, teacher s name, course name and number on the Part I answer sheet. heck the exam to see that there are no missing pages. ALL MATERIALS MUST BE PASSED IN WIT TIS EXAM. Use your time wisely. Good luck!

2 Part 1 Total Value: 40% 1. ow many neutrons are in an atom of magnesium-25? (A) 12 (B) 13 () 25 (D) ow many moles are in a sample that contains atoms of aluminum? (A) mol (B) 4.50 mol () mol (D) mol 3. What is the molar mass of lead(ii) sulfate, PbSO? (A) g/mol (B) g/mol () g/mol (D) g/mol 4. ow many moles are in g of N Br (molar mass = g/mol)? (A) mol (B) mol () mol (D) mol 5. The molar mass of a compound with the empirical formula of O is g/mol. What is the molecular formula of the compound? (A) O (B) O () O (D) O hemistry 2202 Sample Final Exam June 2009 Page 2

3 6. Which unit expresses molar concentration? (A) g/mol (B) L/mol () mol/g (D) mol/l 7. Which is the correct dissociation equation for Na SO? (A) Na SO ( ) 2Na ( ) (B) Na SO ( ) Na ( ) () Na SO ( ) 2Na ( ) (D) Na SO ( ) 2Na ( ) SO ( ) SO ( ) S ( ) 4 O ( ) 4SO ( ) 8. A salt solution has a concentration of mol/l. ow many moles of salt are present in a 2.63 L sample of the solution? (A) mol (B) mol () 1.84 mol (D) 3.76 mol 9. What is the mass of formula units of Al O (Molar mass = g/mol)? (A) g (B) 12.9 g () 806 g (D) g 10. Given the balanced equation 3Mg(NO ) Al (SO ) 3MgSO 2Al(NO ) what mass of MgSO (molar mass = g/mol) should be produced in a reaction of 4.50 mol of Al (SO ) with sufficient Mg(NO )? (A) g (B) 181 g () 542 g (D) 1630 g hemistry 2202 Sample Final Exam June 2009 Page 3

4 11. What volume of a 6.00 mol/l l ( ) solution is required to prepare ml of a 2.00 mol/l l ( ) solution? (A) ml (B) L () 167 ml (D) 1.50 L 12. Sulfur dioxide, SO, which is produced as a result of burning coal, contributes to acid rain. Sulfur dioxide can be removed from smokestacks by reacting it with calcium carbonate, ao. 2SO ( ) 2aO ( ) O 4 O ( ) 2aSO 2 O ( ) 2O ( ) ow many moles of oxygen are needed to react with 50 moles of SO ( )? (A) 1 mol (B) 25 mol () 52 mol (D) 100 mol 13. What is the concentration of a L solution that has 7.90 g of Nal (Molar mass = g/mol) dissolved? (A) mol/l (B) mol/l () mol/l (D) 2.77 mol/l 14. What is the average atomic mass of the newly found element Nonamium (No) given the following percent abundances: Isotope Nonamium-280 Nonamium-281 Nonamium-282 amu % Abundance % 13.55% 60.20% (A) amu (B) amu () amu (D) amu hemistry 2202 Sample Final Exam June 2009 Page 4

5 15. Which compound has high solubility in water? (A) Ag SO (B) a( OO) () MgSO (D) Zn(O) 16. What is the volume of 1.25 g of sulfur dioxide, SO ( ) (Molar mass = g/mol), at STP? (A) L (B) L () L (D) L 17. A 20.0 g sample of al 2 O (Molar mass = g/mol) is heated to remove the water. What mass of al will be present after all the water is removed? (A) g (B) g () 4.35 g (D) 15.1 g 18. A piece of copper metal is immersed in a beaker containing silver nitrate solution. After 2 days the beaker contained copper metal, silver metal, and copper (II) nitrate. Which is the limiting reagent? (A) copper metal (B) copper (II) nitrate () silver metal (D) silver nitrate 19. What is an ionic bond? (A) The attraction of oppositely charged ions (B) The attraction of positive ions for mobile valence electrons () The attraction of positive nuclei for shared pairs of electrons (D) The attraction of opposite dipoles of neighbouring molecules hemistry 2202 Sample Final Exam June 2009 Page 5

6 20. Which bond is non-polar? (A) -F (B) -N () -O (D) -S 21. ow many lone pairs of electrons are in a molecule of l? l (A) 1 (B) 3 () 6 (D) Which substance, in its liquid state, has hydrogen bonding intermolecular forces? (A) (B) Br () Mg (D) N 23. Which molecular compound has a tetrahedral shape? (A) (B) l () O (D) N 24. An unknown substance has a melting point of 675. It is a good conductor of heat and electricity in the liquid and solid states. ow should this substance be classified? (A) ionic (B) metallic () molecular (D) network solid hemistry 2202 Sample Final Exam June 2009 Page 6

7 25. Which is the strongest force found in a crystal of sodium chloride, Nal? (A) Dipole-Dipole (B) ydrogen Bonding () Ionic Bonding (D) London Dispersion 26. Which substance has Dipole-Dipole Forces? (A) F (B) () S (D) Sil 27. Which molecule contains a double bond? (A) AsI (B) O () F (D) N 28. Which bond is most polar? (A) -F (B) N-O () P-I (D) S-Br 29. Which substance is miscible with water? (A) l (B) () Br (D) O hemistry 2202 Sample Final Exam June 2009 Page 7

8 30. Which Lewis diagram is drawn correctly? (A) N N (B) As () Na l (D) O O 31. A student has 3 colourless aqueous solutions (X, Y and Z). The student does a conductivity test on the solutions and finds that only solution Z conducts electricity. Which list identifies the solutes? X Y Z (A) O ( ) Nal ( ) O ( ) (B) O ( ) O ( ) Nal ( ) () l ( ) O ( ) Nal ( ) (D) l ( ) Nal ( ) O ( ) 32. Which is an organic compound? (A) Na O (B) O () MgSO (D) Be(lO) 33. Which compound is classified as an aromatic hydrocarbon? (A) (B) () (D) hemistry 2202 Sample Final Exam June 2009 Page 8

9 34. Which is cis -2-pentene? (A) (B) () (D) Which has a double bond? (A) butene (B) cyclohexane () ethyne (D) propane 36. Which is a hydrocarbon derivative? (A) (B) () O (D) 37. Which is an isomer of cyclononane? (A) 2,4 dimethylheptane (B) 2 nonene () cyclononene (D) nonyne hemistry 2202 Sample Final Exam June 2009 Page 9

10 38. What is the name of this compound? (A) 4,5-dimethyl-2-heptene (B) 3,4-dimethyl-5-heptene () 3,4-dimethyl-3-heptene (D) 3,4-dimethyl-2-heptene 39. A student picks up a bottle containing four hydrocarbons. If the cover is left off the bottle, which hydrocarbon will vapourize last? (A) 2-methyl-3-ethylpentane (B) 2,3 dimethylhexane () 2-methyl-3-ethylheptane (D) 3-methyloctane 40. Which substance reacts with ethanol to produce the compound below? O O 2 3 (A) propanoic acid (B) pentanol () pentanoic acid (D) propanol End of Part 1 hemistry 2202 Sample Final Exam June 2009 Page 10

11 Part II- onstructed Response Total Value : 60% Answer ALL questions in the space provided. All necessary workings must be shown to receive full marks arks. Value a. A compound is found to have a percent composition of 72.71% oxygen and 27.29% carbon. Determine the empirical formula of the compound. 3 b. (i) alculate the mass of potassium sulfate, K SO, required to produce 2.50 L of 1.25 mol/l solution. 2 (ii) With reference to appropriate equipment, outline the steps you would use to make the potassium sulfate solution described above. hemistry 2202 Sample Final Exam June 2009 Page 11

12 41. (continued) Value 3. c. alculate the mass of 4.00 L of ammonia gas (N ( ) ) at STP. 4 d. Excess hydrogen chloride (l) is mixed with 80.0 g of tin (II) fluoride (SnF ) and excess hydrochloric acid. alculate the mass of tin (II) chloride that would be produced. SnF ( ) 2l ( ) Snl ( ) 2F ( ) 4 e. In the laboratory, a student reacts mol of solid iron with 50.0 ml of 1.50 mol/l copper (II) chloride solution, 2 Fe ( ) 3 ul ( ) 2 Fel ( ) 3 u ( ) Using appropriate calculations, identify the limiting reagent. hemistry 2202 Sample Final Exam June 2009 Page 12

13 41. (continued) Value 4 f. alcium ion,, is one of the ions in human blood. Using the solubility table, determine which substances below, if swallowed, would result in a significant decrease in calcium ion concentration in the blood. Give reasons for choices in the space provided. Substance Decrease in (Yes/No) Reason sodium acetate (Na OO) sodium chloride (Nal) sodium nitrate (NaNO ) sodium sulfate (Na SO ) 3 g. opper exists as two naturally occurring isotopes. One isotope has an atomic mass of amu and a relative abundance of 69.1%. The percent abundance of the other isotope is 30.9%. If the average atomic mass of copper is amu, calculate the atomic mass of the other isotope. hemistry 2202 Sample Final Exam June 2009 Page 13

14 Value 42. a. For the molecule Sl, 2 (i) Draw the Lewis dot diagram. 2 (ii) Draw and name the VSEPR shape diagram. 2 (iii) Explain why Sl is a polar molecule. 3 b. Explain why diamond has a higher melting point than graphite, yet both are made up of only carbon atoms. c. For the 2 compounds and, 3 (i) Identify the intermolecular forces present in each compound Bonding Forces LDF Dipole-Dipole ydrogen Bonding (Yes/No) (Yes/No) 1 (ii) Identify which compound has the higher boiling point based on the forces present. hemistry 2202 Sample Final Exam June 2009 Page 14

15 Value 4 d. onsider the data for four different substances: Substance Melting Boiling Electrical onductivity Point Point Solid In Water W Poor Good X 2730 Very igh Poor N/A Y Poor Poor Z Good Good Use the information provided in the table to identify and explain which substance has: (i) Network ovalent Bonding (ii) Ionic Bonding 43. A. Name each compound using the IUPA naming rules. 2 (i) Name: 2 (ii) Br Name: 2 (iii) 3 3 Name: hemistry 2202 Sample Final Exam June 2009 Page 15

16 Value B. Draw a structural diagram for each compound: 2 (i). 2-hexanol 2 (ii). 4-ethyl-4-methyl-2-heptyne 2 (iii). 3-pentanone 4. A reaction between ethene and water produces ompound A. ompound A is further reacted with ethanoic acid to produce ompound B. Use structural diagrams to show ompound A and ompound B. hemistry 2202 Sample Final Exam June 2009 Page 16