Technical Sciences Grade 12 P2 EC June Exemplar 2021 QP

NATIONAL SENIOR CERTIFICATE GRADE 12 JUNE 2021 TECHNICAL SCIENCES P2 (EXEMPLAR) MARKS: 75 TIME: 1 ½ hours This question paper consists of 14 pages, including 2 data sheets.

2 TECHNICAL SCIENCES P2 (EC/JUNE 2021) INSTRUCTIONS AND INFORMATION 1. This question paper consists of SEVEN questions. Answer ALL the questions in the ANSWER BOOK. 2. Start EACH question on a NEW page in the ANSWER BOOK. 3. Number the answers correctly according to the numbering system used in this question paper. 4 Leave ONE line between two sub-questions, for example, between QUESTION 2.1 and QUESTION 2.2. 5. You may use a non-programmable calculator. 6. You are advised to use the attached DATA SHEETS. 7. Round off your FINAL numerical answers to a minimum of TWO decimal places. 8. Give brief motivations, discussions etc. where required. 9. Write neatly and legibly. Copyright reserved Please turn over

(EC/JUNE 2021) 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 (1.1–1.10) in the ANSWER BOOK, for example 1.11 D. 1.1 The positional isomer of the molecule below is … H H H H C C C H H Cl H A B C D H H H H C C C Cl H H H (2) Copyright reserved Please turn over

4 TECHNICAL SCIENCES P2 (EC/JUNE 2021) 1.2 H H O H H C C C C H H H H The IUPAC name for the compound above is … A butanal. B butanol. C butanone. D butanoic acid. (2) 1.3 The structure above represents a/an … A ketone. B aldehyde. C ester. D carboxylic acid. (2) 1.4 Which of the following groups of elements can be used for doping? A Group 3 and Group 5 elements B Alkali metals (Group 1) and alkali earth metals (Group 2) C All transition metals since they can conduct electricity D Halogens (Group 7) and inert gases (Group 8) (2) Copyright reserved Please turn over

(EC/JUNE 2021) TECHNICAL SCIENCES P2 5 1.5 The correct labels for V and W are respectively: V W A Intramolecular forces Intermolecular forces B Intermolecular forces Intramolecular forces C Inter atomic forces Chemical bonds D Chemical bonds Inter-atomic forces (2) [10] Copyright reserved Please turn over

6 TECHNICAL SCIENCES P2 (EC/JUNE 2021) QUESTION 2 (Start on a new page.) Give ONE word for each of the following statements. 2.1 When a hydrocarbon burns in oxygen. (1) 2.2 Organic molecules with the same molecular formula, but different structural formulae. (1) 2.3 A large molecule composed of smaller monomer units covalently bonded to each other in a repeating pattern. (1) 2.4 A semiconductor doped with phosphorus (P), arsenic (As) or antimony (Sb) as an impurity. (1) [4] Copyright reserved Please turn over

(EC/JUNE 2021) TECHNICAL SCIENCES P2 7 QUESTION 3 (Start on a new page.) The diagram below represents the model of propene. Propene is one of the most important organic compounds that is used in the industry to manufacture various products such as propanol and esters. 3.1 3.1.1 Define the term organic compound. (2) 3.1.2 Write down the general formula for alkenes. (1) 3.1.3 To which homologous series does propanol belong? (1) 3.1.4 What is the NAME of the functional group which propanol belongs to? (1) 3.1.5 Draw the structural formula of propan-2-ol. (2) 3.2 Propyl methanoate is the ESTER that is a product of an industrial process mentioned in the statement above. Use this information and answer the following questions. 3.2.1 Name the type of intermolecular forces found between esters and between alcohols. (2) 3.2.2 Write down the NAME of the carboxylic acid used to form the propyl methanoate. (1) 3.2.3 Draw the structural formula of the functional isomer of propyl methanoate. (2) 3.2.4 Draw the structural formula for the FUNCTIONAL GROUP of the isomer mentioned in QUESTION 3.2.3 above. (1) Copyright reserved Please turn over

8 TECHNICAL SCIENCES P2 (EC/JUNE 2021) 3.3 Consider the organic compounds given below and answer the questions that follow. A. H H H H H B. H І І І І І І H–C–C–C–C–C–H H–C–H І І І І І H H H H H H H H І І І H–C–C–C–C–H І І І І H H H H C. H І H–C–H H H H І І І H–C–C–C–C–H І І І І H H H H Write down: 3.3.1 ONE similarity between compounds A, B and C (1) 3.3.2 ONE observable difference between A and B (1) 3.3.3 The homologous series to which these compounds belong (1) 3.4 Write down the IUPAC names of the compounds represented by the following letters: 3.4.1 A (1) 3.4.2 B (2) 3.4.3 C (1) 3.4.4 Which of these compounds has the smallest surface area? Write only A, B or C. (1) 3.4.5 Explain your answer to QUESTION 3.4.4 above. (2) Copyright reserved Please turn over

(EC/JUNE 2021) TECHNICAL SCIENCES P2 9 3.5 3.5.1 Define the term plastic in words. (2) 3.5.2 Choose TWO industrial uses of polyethene from the list given in the table below. USES A Electroplating B Food packaging plastics C Squeezable bottles D Electrorefining E Flexible water pipes F Aluminium extraction (2 x 1) (2) [27] Copyright reserved Please turn over

10 TECHNICAL SCIENCES P2 (EC/JUNE 2021) QUESTION 4 (Start on a new page.) In the table below FIVE substances, as well as their molecular formula and viscosity, are given. Use the table to answer the questions which follow. SUBSTANCE MOLECULAR FORMULA VISCOSITY (mPa.s) A Pentane C5H12 X B Chlorohexane C6H11Cl 0,695 C Pent-2-ene C5H10 0,210 D Ethanol C2Hn6O 1,074 E Propan-1-ol C3H8O 1,945 4.1 Define the term vapour pressure. (2) 4.2 Identify the TYPE of intermolecular force in: 4.2.1 Chlorohexane (1) 4.2.2 Pent-2-ene (1) 4.3 Use the table above to answer these questions. How does the viscosity of chloro-hexane compare with the viscosity of pentane? Write only HIGHER or LOWER. Explain your answer. (2) 4.4 Explain, by referring to intermolecular forces and energy, which of the organic compounds from the table above will have the highest vapour pressure. (3) 4.5 Which intermolecular forces are common between pent-2-ene and ethanol? (2) [11] Copyright reserved Please turn over

(EC/JUNE 2021) TECHNICAL SCIENCES P2 11 QUESTION 5 (Start on a new page.) Hydrocarbons are famous for being the primary constituents of fossil fuels. Energy is obtained from fossil fuels through combustion of the fuel. Hydrocarbon combustion is the primary process in the burning of fossil fuels. Regardless of the type of hydrocarbon, the combustion produces the same products and large amounts of thermal heat are released. 5.1 Define the term hydrocarbon. (1) 5.2 Write down: 5.2.1 A balanced chemical reaction for the complete combustion of methane using a molecular formula (3) 5.2.2 The reaction conditions for the complete combustion of methane (1) [5] Copyright reserved Please turn over

12 TECHNICAL SCIENCES P2 (EC/JUNE 2021) QUESTION 6 (Start on a new page.) 6.1 Consider the flow diagram below and answer the questions that follow. H H H H +H2O І І І І + H2 Compound Alcohol D H–C–C=C–C–C–H І І І І Reaction 1 A Reaction 4 H H H H HBr Reaction 2 + Ethanoic Reaction 5 Compound B acid H2O Reaction 3 Ester + Inorganic Compound E Compound C Write down the NAME/TYPE of the following: 6.1.1 Reaction 3 (1) 6.1.2 Reaction 4 (1) 6.1.3 Reaction 5 (1) 6.2 Write down the IUPAC name for the following compounds: 6.2.1 Secondary alcohol D (1) 6.2.2 Minor product compound B (1) 6.2.3 Inorganic compound E (1) 6.3 Write down the reaction conditions for the following reactions: 6.3.1 Reaction 1 (1) 6.3.2 Reaction 2 (1) 6.4 Draw the structural formula of compound C. (2) 6.5 Write down: 6.5.1 A balanced chemical reaction for Reaction 5 using structural formulae (4) 6.5.2 The NAME of the ester formed in Reaction 5 (1) 6.5.3 A balanced chemical reaction for Reaction 1 using structural formulae (3) [18] TOTAL: 75 Copyright reserved Please turn over

(EC/JUNE 2021) TECHNICAL SCIENCES P2 13 NATIONAL SENIOR CERTIFICATE NASIONALE SENIOR SERTIFIKAAT DATA FOR TECHNICAL SCIENCES GRADE 12 PAPER 2 GEGEWENS VIR TEGNIESE WETENSKAPPE GRAAD 12 VRAESTEL 2 TABLE/TABEL 1: PHYSICAL CONSTANTS / FISIESE KONSTANTES NAAM/NAME SIMBOOL/SYMBOL WAARDE/VALUE Standard pressure / p 1,01 x 105 Pa Standaarddruk Standard temperature / Standaardtemperatuur T 273 K Speed of light in a vacuum/ c 3,0 x 108 m·s-1 Spoed van lig in ʼn vakuum Planck’s constant / Planck se h 6,63 x 10-34 J·s konstante Copyright reserved Please turn over

14 TECHNICAL SCIENCES P2 (EC/JUNE 2020) 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 1 Atomic number 2 H He 2,1 29 1 4 Elektronegatiwiteit Simbool 3 4 1,9 5 6 7 8 9 10 Li Be Electronegativity Cu Symbol B C N O F Ne 1,0 1,5 2,0 2,5 3,0 3,5 4,0 7 9 63,5 11 12 14 16 19 20 11 12 13 14 15 16 17 18 Na Mg Benaderde relatiewe atoommassa Aℓ Si P S Cℓ Ar 0,9 1,2 Approximate relative atomic mass 1,5 1,8 2,1 2,5 3,0 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 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 0,8 1,0 1,3 1,5 1,6 1,6 1,5 1,8 1,8 1,8 1,9 1,6 1,6 1,8 2,0 2,4 2,8 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 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 0,8 1,0 1,2 1,4 1,8 1,9 2,2 2,2 2,2 1,9 1,7 1,7 1,8 1,9 2,1 2,5 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 Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tℓ Pb Bi Po At Rn 0,7 133 0,9137 139 1,6 179 181 184 186 190 192 195 197 201 1,8204 1,8 207 1,9 209 2,0 2,5 87 88 89 Fr Ra Ac 0,7 0,9226 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