Klastoets 2.pdf - VAN Voorletters SURNAME Initials US Nr...

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1 VAN, Voorletters: MEMO US Nr.: M E M O M E M O SURNAME, Initials : CHEMIE 124: Grondbeginsels in CHEMISTRY 124: Fundamental Principles Chemie I of Chemistry I Klastoets / Class test 29 April 2014 Instruksies: Instructions : 90 minute, toeboek, drie vrae met onderaf- 90 minutes, closed book, three questions delings. with sub sections. 50 punte lei tot volpunte vir die vraestel. 50 marks lead to full marks. By vrae van die uitskryf tipe moet alle For questions of the written type all berekeninge en/of stappe getoon word. calculations and/or steps must be shown. Korrekte antwoorde verdien nie noodwendig Correct answers but without any explanation volpunte sonder die nodige verduidelikings will not earn full marks. nie. Beantwoord alle vrae van die vraestel. Answer all the questions in this paper. Use Formuleer jou antwoord in die oop ruimtes the empty places after each question for onder elke vraag. your answer. Hierdie vraestel bestaan uit 8 bladsye. This question paper consists of 8 pages. Nie-programmeerbare sakrekenaars word Non-programmable calculators are allowed. toegelaat. Deur my handtekening hieronder te plaas, By placing my signature in the space below, bevestig ek dat die gegewens wat ek op hierdie I confirm that the particulars furnished by blad verstrek het, waar en korrek is. me on this front cover are true and correct. Dosente / Lecturers : Handtekening Vraag Punte Dr K de Villiers MEMO 1 40 Prof C Esterhuysen 2 5 Dr T le Roex 3 5 Dr P Verhoeven Signature Totaal 50
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2 Meerkeuse vrae Multiple choice Questions Vraag 1 (40 punte) Question 1 (40 marks) Let wel: Elke vraag tel 2 punte Note : Each question is worth 2 marks 1. Bereken die entalpie vir die sintese van kalsium karbonaat uit kalsium oksied en koolstofdioksied Calculate the enthalpy for the synthesis of calcium carbonate from calcium oxide and carbon dioxide CaO(s) + CO 2 (g) CaCO 3 (s) gegewe die entalpieë van die reaksies hieronder. given the enthalpies of the reactions below. 2 Ca(s) + O 2 (g) 2 CaO(s) Δ H = -1270.2 kJ C(s) + O 2 (g) CO 2 (g) Δ H = -393.5 kJ 2 Ca(s) + 2 C(s) + 3 O 2 (g) 2 CaCO 3 (s) Δ H = -2413.8 kJ a. -4077.3 kJ b. -2235.5 kJ c. -750.1 kJ d. -350.2 kJ e. -178.3 kJ 2. Watter van die volgende chemiese vergelykings stem ooreen met die standard vormingsentalpie van N 2 O 5 ? / Which of the following chemical equations corresponds to the standard enthalpy of formation of N 2 O 5 ? a. N 2 O 3 (s) + O 2 (g) N 2 O 5 (s) b. NO 2 (g) + NO(g) + O 2 (g) N 2 O 5 (g) c. 2 N 2 (g) + 5 O 2 (g) 2 N 2 O 5 (s) d. 2 N(g) + 5 O(g) N 2 O 5 (s) e. N 2 (g) + 5/2 O 2 (g) N 2 O 5 (s) 3. Bo watter temperatuur sou u verwag dat 'n reaksie spontaan sou word indien Δ H = +322 kJ en Δ S = +531 J/K? / Above what temperature would you expect a reaction to become spontaneous if Δ H = +322 kJ and Δ S = +531 J/K .
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