Technical Sciences Grade 12 P2 Eastern Cape June 2025 QP

NATIONAL SENIOR CERTIFICATE GRADE 12 JUNE 2025 TECHNICAL SCIENCES P2 MARKS: 75 TIME: 1½ hours *JTSCE2* This question paper consists of 10 pages, including 1 data sheet. This document was downloaded from www.ecexams.co.za.

2 TECHNICAL SCIENCES P2 (EC/JUNE 2025) INSTRUCTIONS AND INFORMATION 1. Write your FULL NAME and SURNAME in the appropriate spaces in the ANSWER BOOK. 2. This question paper consists of FIVE questions. Answer ALL the questions. 3. Start EACH question on a NEW page in the ANSWER BOOK. 4. Number the answers correctly according to the numbering system used in this question paper. 5. Leave ONE line between two subquestions, for example between QUESTION 2.1 and QUESTION 2.2. 6. You may use a non-programmable calculator. 7. You are advised to use the attached DATA SHEET. 8. Round off your FINAL numerical answers to a minimum of TWO decimal places. 9. You may use appropriate mathematical instruments. 10. Show ALL formulae and substitutions in ALL calculations. 11. Give brief motivations, discussions et cetera where required. 12. Write neatly and legibly. Copyright reserved Please turn over This document was downloaded from www.ecexams.co.za.

(EC/JUNE 2025) 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 Which of the following compounds represent a positional isomer of 1-chloropropane? A 1,2-dichloropropane B 2-chloropropane C 1-bromopropane D propan-2-ol (2) 1.2 Butane is burned in excess oxygen. What is the CORRECT balanced equation for the combustion of butane? A C4H10 + 2O₂ → 4CO₂ + 5H₂O B C4H10 + 6,5O₂ → 4CO₂ + 5H₂O C 2C4H10 + 13O₂ → 8CO2 + 10H₂O D 4C4H10 + 26O₂ → 16CO2 + 20H₂O (2) 1.3 The TYPE of intermolecular forces found in carboxylic acids. A London forces and hydrogen bonds B London forces and dipole-dipole forces C London forces and ion-dipole forces D Only London forces (2) Copyright reserved Please turn over This document was downloaded from www.ecexams.co.za.

4 TECHNICAL SCIENCES P2 (EC/JUNE 2025) 1.4 The TYPE of substitution reaction where a haloalkane is converted to an alcohol is known as … A hydrohalogenation. B hydrogenation. C hydrolysis of haloalkanes. D hydration. (2) 1.5 How many electrons does a pentavalent material have in its outermost energy level? A 2 B 3 C 4 D 5 (2) [10] Copyright reserved Please turn over This document was downloaded from www.ecexams.co.za.

(EC/JUNE 2025) TECHNICAL SCIENCES P2 5 QUESTION 2 (Start on a new page.) Consider the organic compounds represented by the letters A to H below and answer the questions that follow. A B C4H9Br C D O II CH3CH2CH2CCH3 E F 3,4-dimethylhex-1-yne G H 2.1 Define the term homologous series. (2) 2.2 Write the name of the HOMOLOGOUS SERIES to which each of the following compounds belong: 2.2.1 B (1) 2.2.2 D (1) Copyright reserved Please turn over This document was downloaded from www.ecexams.co.za.

6 TECHNICAL SCIENCES P2 (EC/JUNE 2025) 2.3 Write down the letter(s) that represents the following compounds: 2.3.1 An alkene (1) 2.3.2 A ketone (1) 2.3.3 Having the general formula CnH2n-2 (1) 2.3.4 A saturated hydrocarbon (1) 2.3.5 That has the same general formula as a carboxylic acid (1) 2.4 Compounds C and H are structural isomers. 2.4.1 Define the term structural isomer. (2) 2.4.2 What TYPE of structural isomers are compounds C and H? (1) 2.5 Is compound D a PRIMARY, SECONDARY or TERTIARY alcohol? Give a reason for the answer. (3) 2.6 Consider compound C, E, F and H. 2.6.1 Write down the IUPAC name of compound F (2) 2.6.2 Draw the structural formula of compound E (3) 2.6.3 Write down the name of the functional group of compound C (1) 2.6.4 Draw the structural formula for the functional group of compound H (1) 2.7 Compound G is a monomer. 2.7.1 Define the term polymerisation. (2) 2.7.2 Write down the name of a polymer that can be formed from monomer G. (2) [26] Copyright reserved Please turn over This document was downloaded from www.ecexams.co.za.

(EC/JUNE 2025) TECHNICAL SCIENCES P2 7 QUESTION 3 (Start on a new page.) A group of grade 12 learners were observing the boiling points of five organic compounds from three different homologous series. The number of carbon atoms of these organic compounds ranges between 3 carbon atoms and 4 carbon atoms. Their results were tabulated as follows. Molecular Compound Name Boiling point Formula A Propane −42 °C C3H8 B Butane −1 °C C4H10 C 1-Bromopropane 64,7 °C C3H7Br D 1-Bromobutane 101,4 °C C4H9Br E Butan-1-ol 117,7 °C C4H9OH 3.1 Define the term boiling point. (2) 3.2 Which type of intermolecular forces occur in each of the following compounds? 3.2.1 D (1) 3.2.2 E (1) 3.3 Explain how the boiling points of compounds A and B compare to each other by referring to the INTERMOLECULAR FORCES, STRUCTURE, STRENGTH and THE ENERGY NEEDED. (4) 3.4 Define the term vapour pressure. (2) 3.5 Which compound from the table above, will have the highest vapour pressure? Give a reason for the answer. (2) 3.6 Which compound from the table above, will have the highest viscosity? (1) [13] Copyright reserved Please turn over This document was downloaded from www.ecexams.co.za.

8 TECHNICAL SCIENCES P2 (EC/JUNE 2025) QUESTION 4 (Start on a new page.) But-1-ene undergoes various reactions, and different products are formed from each reaction. Study the diagram below and answer the questions that follow. Reaction 2 Compound X + H2O Reaction 1 + NaOH Reaction 4 Butane Compound Y 4.1 Write down the type of reaction represented by the following reactions: 4.1.1 Reaction 1 (1) 4.1.2 Reaction 3 (1) 4.1.3 Reaction 4 (1) 4.2 For Reaction 1, write down: 4.2.1 The MOLECULAR formula of the inorganic reagent used (1) 4.2.2 ONE catalyst needed for this reaction to take place (1) 4.3 Compound Y is formed as a product in reaction 3. Write down the: 4.3.1 STRUCTURAL formula of compound Y (2) 4.3.2 IUPAC name of compound Y (2) 4.4 Compound X is formed when but-1-ene reacts with H2O in reaction 2. 4.4.1 Name the TYPE of addition reaction that takes place. (2) 4.4.2 Write down the IUPAC name of compound X. (2) 4.4.3 Write down TWO reaction conditions needed for reaction 2 to take place. (2) [15] Copyright reserved Please turn over This document was downloaded from www.ecexams.co.za.

(EC/JUNE 2025) TECHNICAL SCIENCES P2 9 QUESTION 5 (Start on a new page.) Semiconductors are used in the manufacture of electronic devices such as diodes, transistors, and integrated circuits. Consider the diagram below and answer the questions that follow. p-type n-type 5.1 Define the term intrinsic semiconductor. (2) 5.2 Give ONE example of intrinsic semiconductors. (1) 5.3 Is the diagram of the diode above FORWARD BIAS or REVERSE BIAS? Give a reason for the answer. (3) 5.4 Define the term doping. (2) 5.5 Explain why doping is done in a semiconductor. (2) 5.6 Which type of semiconductor forms when boron is added to silicon? (1) [11] TOTAL: 75 Copyright reserved Please turn over This document was downloaded from www.ecexams.co.za.

10 TECHNICAL SCIENCES P2 (EC/JUNE 2025) 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 Atoomgetal (I) (II) KEY/ SLEUTEL (III) (IV) (V) (VI) (VII) (VIII) Atomic number 1 2 2,1 H 29 He 1 Cu Simbool 4 3 4 Elektronegatiwiteit Symbol 5 6 7 8 9 10 Electronegativity 1,9 1,0 Li 1,5 Be 63,5 2,0 B 2,5 C 3,0 N 3,5 O 4,0 F Ne 7 9 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 Co 1,8 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 Rh 2,2 Pd 2,2 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 This document was downloaded from www.ecexams.co.za. Copyright reserved Please turn over

This document was downloaded from www.ecexams.co.za.

This document was downloaded from www.ecexams.co.za.

This document was downloaded from www.ecexams.co.za.

This document was downloaded from www.ecexams.co.za.

This document was downloaded from www.ecexams.co.za.

This document was downloaded from www.ecexams.co.za.