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1 namibia UniVERSITY OF SCIEnCE AnD TECHnOLOGY FACULTY OF HEALTH AND APPLIED SCIENCES DEPARTMENT OF NATURAL AND APPLIED SCIENCES QUALIFICATION: BACHELOR OF SCIENCE QUALIFICATION CODE: 07BOSC LEVEL: 7 COURSE CODE: GNC501S COURSE NAME: GENERAL CHEMISTRY 1A SESSION: JUNE 2016 PAPER: THEORY DURATION: 3 HOURS MARKS: 100 FIRST OPPORTUNITY EXAMINATION QUESTION PAPER EXAMINER(S) Dr. Euodia H. Hess Prof. Habauka M. Kwaambwa MODERATOR: Dr. Marius K. Mutorwa INSTRUCTIONS 1. Answer ALL the questions. 2. Write clearly and neatly. 3. Number the answers clearly. PERMISSIBLE MATERIALS Non-programmable Calculators ATTACHMENT List of Useful Constants & Periodic Table THIS QUESTION PAPER CONSISTS OF 10 PAGES (Including this front page and attachment}

2 SECTION A: MUlTIPlE CHOICE QUESTIONS [60] There are 20 multiple choice questions in this section. Each question carries 3 marks. Answer All questions by selecting the letter of the correct answer. Choose the best possible answer for each question, even if you think there is another possible answer that is not given. 1. The number of significant figures in A. is 4 B. is 3 c. is 2 D. is 1 E. cannot be specified. 2. A distance is determined to be 1000 mm. This distance can also be reported as A m B em C dm D. 1mm E. A, B, C and D 3. What is the total number of orbitals in the shell n = 4 of the H atom? A. 4 B. 8 c. 12 D. 16 E The number of unpaired electrons in 28 Ni and 24 Cr 3 + are, respectively: A. 2, 3 B. 8, 5 c. 2,4 D. 8,3 E. 3, 2 2

3 5. From the following list, select the elements that are metals: i. Fe, ii. s, iii. Si, iv. Na, v. U, vi. Hg A. ii, iii B. i, iv, v c. i, iv, v, vi D. iii, iv, v E. i, vi 6. Which one of the following Name-Formula combinations is NOT correct (is FALSE)? A. Mercury (I) nitrate, HgN03 B. Calcium phosphate, Ca3(P04h C. Copper (II) sulfate pentahydrate, CuS04"SH20 D. Tetraphosphorus decoxide, P40 10 E. Hydrofluoric acid, HF(aq) 7. What is the percentage composition of calcium in calcium hydroxide, Ca(OH)z? A. 40% B. 43% c. 54% D. 69% E. 74% 8. Analysis of a gas C = 85.7% and H = 14.3%. If the molecular formula molar mass of this gas is 42 amu, what are the empirical formula and the true formula? A. CH; C4H4 B. CH2; C3HG c. CH3; C3H9 D. C2H2; C3HG E. C2H4; C3HG 3

4 9. When g of CaS0 4 (Molar mass= g/mol) are dissolved in enough water to yield a volume of 725 ml of solution. The molarity of this solution will be... A M B M C M D M E. Insufficient information 10. What are the simplest coefficients that balance this equation? A. 1, 6, 4, 2 B. 2, 13, 8, 10 c. 1, 6, 1, 5 D. 3, 10, 16,20 E. 4, 26, 16, Under conditions of fixed temperature and amount of gas, Boyle's law requires that: PN1 = PzVz PV = constant PJPz = Vz/V1 I II Ill A. I only B. II only c. Ill only D. I and II only E. I, II and Ill 12. If mol of He(g), mol of Ne(g) and mol of Ar(g) are transferred to a previously empty 5.00 L container at 25 C, what is the final pressure in the container? A atm B atm C atm D atm E atm 4

5 13. A solution is prepared by dissolving mole of HCI in 75.0 g of water. Calculate the mass percent HCI in this solution. A % B. 4.64% c. 4.87% D. 4.01% E. 4.50% 14. To what volume, ml, must 50.0 ml of 3.50 M H 2 S04 be diluted in order to make 2M HzS04? A. 25 B c D E An aqueous solution contains 64.0 g of ethanol (C 2 H 5 0H) in g of total solution. The mole fraction of ethanol is: A B c D E. None of the above 16. What is the boiling point in C of a solution of a 2.15 m aqueous solution of glycerol? (Kb = C/m) A B c. 100 D. 1.1 E

6 17. Smoke is an example of a colloid termed A. a foam B. an aerosol c. a gel D. sol E. an emulsion 18. Which of these would be least soluble in water? A. ethanol {CH3CHrOH) B. butanol {CH3CH2CH2CH2-0H) C. pentanol {CH3CH2CH2CH2CH2-0H) D. hexanol (CH3CH2CH2CH 2CH2CH2-0H) E. octanol (CH3CH2CH2CH2CH2CH 2CH2CH2-0H) 19. The alcohol shown below is a: A. Primary alcohol B. Secondary alcohol c. Tertiary alcohol D. Allylic alcohol E. Benzylic alcohol 20. A hydrocarbon with the general formula CnH 2 n. 2 can be: A. an alkyne B. an alkyne or a cyclolkane c. a cycloalkane or an alkene D. a cycloalkene E. an alkyne or a cycloalkene 6

7 SECTION B [40] There are SEVEN questions in this section. Answer all Questions. Show clearly, where necessary, how you arrive at the answer as the working will carry marks too. Question 1 For each of the following, give the corresponding name or formula (a) Mecury(l) nitrite (b) Cesium sulfide (c) NH4CI03 (d) P40w [4] Question 2 [7] a) Ascorbic acid (vitamin C) cures scurvy. It is composed of 40.92% (C), 4.58% (H), and 54.50% (O) by mass. Determine its empirical formula. (5) b) Mesitylene, a hydrocarbon that occurs in small amounts in crude oil, has empirical formula of C3H4. The experimentally determined molecular weight of this substance is 121 amu. What is the molecular formula of mesitylene? Question 3 [9] A student synthesised 1.50 g aspirin (C 9 H 8 0 4) in a laboratory by reacting 1.50 g salicylic acid (C 7 H 6 0 3) with 2.00 g acetic anhydride (C4H 6 0 3). The balanced equation is (a) Which compound is the limiting reactant? (b) What is the theoretical yield of aspirin? (c) How much of excess reactant in grams remains after the reaction is completed? (d) What is the percentage yield? (3) Molar masses (g/mol): C 7 H = ; C4H = ; C 9 Ha04 = Question 4 [3] A sample of gas occupies a volume of 20 dm 3, has a temperature of 280 K and has a pressure of 105 Pa. Calculate the number of moles of gas that are present in the sample. 7

8 Question 5 [6] An aqueous solution that contains g sulphuric acid (H 2 S0 4 ) in one liter of solution has a density of gcm- 3. Calculate the following for the H 2 S0 4 : (a) Molarity (b) Mass percent (c) Molality (d) Mole fraction Question 6 [6] a) The temperature of a piece of copper with a mass of 95.4 g changes from 25.0 octo 48.0 oc when the metal absorbs 849 J of heat. What is the specific heat of copper? b) What factors determine the heat capacity of an object? c) What is the relationship between a calorie and Calorie? Question 7 (a) Write the IUPAC names of the following compounds: [5] (i) (ii) (b) State the functional group in each of the following compounds: (3) (i) CH3 --O--CH 3 (ii) 0 II CH 3 --c --OH 8

9 (iii) 0 II CH 3 --c --OCH 3 (iv) CH 3-NH-CH2-CH3 (v) (vi) CH 3 --OH 0 II CH 3 --c --CH 3 END OF EXAM QUESTIONS USEFUL CONSTANTS: Gas constant, R = J marl K- 1 = dm 3. ba r marl K- 1 = L atm mor 1 K- 1 1 Pa m 3 = 1 kpa.l = 1 N m = 1 J 1 atm = Pa = 760 mmhg = 760 torr Avogadro's Number, NA = X mor 1 Planck's constant, h = x Js Speed of light, c = x 10 8 ms- 1 9

10 1 H Li Be Na Mg K Ca Sc Ti Rb Sr y Zr Cs Ba Lu Hf Fr Ra Lr Rf (223) (260) (261) PERIODIC TABLE OF THE ELEMENTS He B c N 0 F Ne AI Si p s Cl Ar v Cr Mn Fe Co. Ni Cu Zn Ga Ge As Se Br Kr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe (98) Ta w Re Os lr Pt Au Hg Tl Pb Bi Po At Rn (209) (210) (222) Ill Db Sg Bh Hs Mt Uun Uuu Uub Uuq Uuh Uuo (262) (263) (264) 1(265) 1 268) (269) (2722 (269) - Lanthanides: Actinides: セYRU@ QVNセST@ La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb (145) Ac Th Pa u Np Pu Am em Bk Cf Es Fm Md No (244) (243) (247) (247) (251) (252) (257) (258) (259)

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