Technical Sciences Grade 11 P2 Eastern Cape November 2023 QP

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE GRADE 11 NOVEMBER 2023 TECHNICAL SCIENCES P2 MARKS: 75 TIME: 1½ hours This question paper consists of 10 pages, including 2 data sheets.

Downloaded from hlayiso.com 2 TECHNICAL SCIENCES P2 (EC/NOVEMBER 2023) INSTRUCTIONS AND INFORMATION 1. This question paper consists of FIVE questions. Answer ALL the questions in the ANSWER BOOK. 2. Start EACH question on a NEW page in the ANSWER BOOK. 3. You may use a non-programmable calculator. 4. You may use appropriate mathematical instruments. 5. You are advised to use the attached PERIODIC TABLE. 6. Number the answers according to the numbering system used in this question paper. 7. Show ALL formulae and substitutions in ALL calculations. 8. Round off your FINAL numerical answers to a minimum of TWO decimal places. 9. Give brief motivations, discussions etc. where required. 10. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/NOVEMBER 2023) TECHNICAL SCIENCES P2 3 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.5) in the ANSWER BOOK, for example 1.6 D. 1.1 The SI unit for specific heat capacity is the … A Kelvin. B Joules per Kilogram Kelvin. C Joules. D Joules per Kilogram. (2) 1.2 The formula that gives the relationship between heat capacity and specific heat capacity correctly, is … A Q = 𝑚𝑐𝛥𝑡. 𝑚 B C= 𝑐 . C 𝑄 C = ∆𝑡. D C = 𝑚𝑐. (2) 1.3 A learner left a solution of copper sulphate in a zinc container overnight. The next morning a brown insoluble substance coated the sides and bottom of the zinc container. The container was corroded and some of the solution had leaked to the floor. Which ONE of the following reactions took place inside the zinc container? A Cu(s) + ZnSO4(aq) → CuSO4(aq) + Zn(s) B Cu2+(aq) + ZnSO4(aq) → CuSO4(aq) + Zn(s) C Zn2+(aq) + CuSO4(aq) → ZnSO4(aq) + Cu2+(aq) D Zn(s) + CuSO4(aq) → ZnSO4(aq) +Cu(s) (2) Copyright reserved Please turn over

Downloaded from hlayiso.com 4 TECHNICAL SCIENCES P2 (EC/NOVEMBER 2023) 1.4 In the reaction: Zn + Pb2+ → Zn2+ + Pb A The zinc ion is the reducing agent B The lead ion is the reducing agent C The lead ion is the oxidising agent D The zinc ion is the oxidising agent (2) 1.5 An oxidising agent is a substance that undergoes … A oxidation and loses electrons in the process. B oxidation and gains electrons in the process. C reduction and loses electrons in the process. D reduction and gains electrons in the process. (2) [10] Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/NOVEMBER 2023) TECHNICAL SCIENCES P2 5 QUESTION 2 (Start on a new page.) Thermodynamics is the branch of science that is built upon the fundamental laws that Heat and Work obey when acting on different objects. 2.1 State the law of conservation of heat. (2) 2.2 520 kJ of heat energy is supplied to a certain machine. 310 kJ of this energy is converted to mechanical work. Calculate the change in internal energy of this machine. (3) 2.3 Define a working substance in Technical Sciences in words. (2) 2.4 Give TWO examples of a working substance. (2) [9] Copyright reserved Please turn over

Downloaded from hlayiso.com 6 TECHNICAL SCIENCES P2 (EC/NOVEMBER 2023) QUESTION 3 (Start on a new page.) 3.1 Define specific heat capacity. (2) 3.2 Distinguish between a surrounding and thermodynamic system. 3.3 Suppose you are given 1 ℓ of water in one container and in another container 1 ℓ of ethyl alcohol. (4) 3.3.1 Which ONE of the 1 ℓ liquids can be used as an excellent coolant? (1) 3.3.2 Explain your answer in QUESTION 3.3.1 using the specific heat capacities of the two liquids. (2) 3.4 220 g of water at 90 °C is added to a certain unknown mass of water at 10 °C. The final temperature of the mixture is 33 °C. Calculate the unknown mass of water. (4) 3.5 The state of the system in thermodynamics is the physical condition of the system as described by values for physical parameters, such as volume, pressure and temperature. 3.5.1 Distinguish between a closed system and an isolated system. (4) 3.5.2 Pieces of warm copper, with a mass of 100 g at a temperature of 81 °C is added to 200 g of water at a temperature of 15 °C. The highest final temperature is 18 °C. Calculate the specific heat capacity of copper. (7) [24] Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/NOVEMBER 2023) TECHNICAL SCIENCES P2 7 QUESTION 4 (Start on a new page.) Chemical change deals with a variety of chemical reactions including Electrochemistry which is the branch that deals with energy conversions due to chemical reactions. 4.1 Differentiate between oxidation and reduction reactions. (4) 4.2 Determine the oxidation numbers of each of the underlined elements. Write down every step to show how you arrived at the answer. 4.2.1 MnO2 (2) 4.2.2 K2Cr2O7 (2) 4.2.3 NH4+ (2) 4.3 Define the term electrolysis in words. (2) 4.4 Consider the following balanced chemical reaction: 2K2O → 4K + O2 Identify the substance which is: 4.4.1 Oxidised (2) 4.4.2 Reduced (2) [16] Copyright reserved Please turn over

Downloaded from hlayiso.com 8 TECHNICAL SCIENCES P2 (EC/NOVEMBER 2023) QUESTION 5 (Start on a new page.) The experimental set up below was used by Grade 11 learners of Technical Sciences to investigate the electrolysis of a copper chloride solution (CuCl2(aq)). battery A B CuCℓ2(aq) 5.1 Define the term electrolyte in words. (2) 5.2 Why is carbon preferred as an electrode? (2) 5.3 What observation will be made at electrodes A and B? (4) 5.4 Which electrode A or B, represents the: 5.4.1 Anode (1) 5.4.2 Cathode (1) 5.5 Write down the half reaction that will take place at the cathode. (2) 5.6 Write down the half-reaction that will take place at the anode. (2) 5.7 State TWO uses of electrolysis in technology. (2) [16] TOTAL: 75 Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/NOVEMBER 2023) TECHNICAL SCIENCES P2 9 DATA FOR TECHNICAL SCIENCES GRADE 11 PAPER 2 GEGEWENS VIR TEGNIESE WETENSKAPPE GRAAD 11 VRAESTEL 2 TABLE 1: SPECIFIC HEAT CAPACITIES/TABEL 1: SPESIFIEKE HITTEKAPASITEITE Name/Naam Values/Waardes (J.kg-1.K-1) Water 4 200 Copper / Koper 400 Aluminium 900 Glass / Glas 700 Ethyl alcohol / Etielalkohol 2 460 Iron / Yster 460 Zinc / Sink 380 Lead / Lood 130 Ice / Ys 2 100 Brass 380 Mercury / Kwik 140 Methylated spirits / Brandspiritus 2 400 TABLE 2: FORMULAE/TABEL 2: FORMULES HEAT AND THERMODYNAMICS/HITTE EN TERMODINAMIKA C=cm Q = c m ∆T ∆Q = ∆U + ∆W WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG 1 ∆x f= ∆v = T ∆t 1 v=fλ T= f Copyright reserved Please turn over

Downloaded from hlayiso.com 10 TECHNICAL SCIENCES P2 (EC/JUNE2022) TABLE 3: THE PERIODIC TABLE OF ELEMENTS/TABEL 3: DIE PERIODIEKE TABEL VAN ELEMENTE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 (I) (II) Atoomgetal (III) (IV) (V) (VI) (VII) (VIII) KEY/ SLEUTEL Atomic number 1 2 2,1 H He 1 29 4 3 4 Elektronegatiwiteit Simbool 5 6 7 8 9 10 1,0 Li 1,5 Be Electronegativity 1,9 Cu Symbol 2,0 B 2,5 C 3,0 N 3,5 O 4,0 F Ne 7 9 63,5 11 12 14 16 19 20 11 12 13 14 15 16 17 18 Benaderde relatiewe atoommassa 0,9 Na 1,2 Mg Approximate relative atomic mass 1,5 Aℓ 1,8 Si 2,1 P 2,5 S 3,0 Cℓ Ar 23 24 27 28 31 32 35,5 40 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 0,8 K 1,0 Ca 1,3 Sc 1,5Ti 1,6 V 1,6 Cr 1,5 Mn 1,8 Fe 1,8 Co 1,8Ni 1,9 Cu 1,6 Zn 1,6 Ga 1,8 Ge 2,0 As 2,4 Se 2,8 Br Kr 39 40 45 48 51 52 55 56 59 59 63,5 65 70 73 75 79 80 84 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 0,8 Rb 1,0 Sr 1,2 Y 1,4Zr Nb 1,8 Mo 1,9 Tc 2,2 Ru 2,2 Rh 2,2 Pd 1,9 Ag 1,7 Cd 1,7 In 1,8 Sn 1,9 Sb 2,1 Te 2,5 I Xe 86 88 89 91 92 96 101 103 106 108 112 115 119 122 128 127 131 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 0,7 Cs 0,9 Ba La 1,6Hf Ta W Re Os Ir Pt Au Hg 1,8 Tℓ 1,8 Pb 1,9 Bi 2,0 Po 2,5 At Rn 133 137 139 179 181 184 186 190 192 195 197 201 204 207 209 87 88 89 0,7 Fr 0,9 Ra Ac 226 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140 141 144 150 152 157 159 163 165 167 169 173 175 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232 238 Copyright reserved Please turn over