NW 12 TECH SCI P2 QP ENG JUNE 2025

PROVINCIAL ASSESSMENT GRADE 12 TECHNICAL SCIENCES P2 JUNE 2025 MARKS: 75 TIME: 1½ hours This question paper consists of 10 pages and 2 data sheets. Copyright reserved Please turn over

Technical Sciences/P2 2 NW/June 2025 Grade 12 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. Number the answers correctly according to the numbering system used in this question paper. 4. Leave ONE line between two subquestions, e.g. 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

Technical Sciences/P2 3 NW/June 2025 Grade 12 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 number (1.1 to 1.5) in the ANSWER BOOK, e.g. 1.6 D. 1.1 Butane is an example of the organic group … A alkene. B esters. C alkanes. D ketones. (2) 1.2 Which ONE of the following is the CORRECT homologous series with the name of the functional group? NAME OF FUNCTIONAL HOMOLOGOUS SERIES GROUP A Alcohol Hydroxyl group B Ketone Carboxyl group C Carboxylic acid Formyl group D Aldehyde Carboxyl group (2) 1.3 Consider the structural formula of the compound below. Identify the CORRECT IUPAC name and the type of hydrocarbon: IUPAC NAME TYPE OF HYDROCARBON A Pent-2-ene Saturated B 2-Pentane Unsaturated C Pent-2-ene Unsaturated D Pent-3-ene Saturated (2) Copyright reserved Please turn over

Technical Sciences/P2 4 NW/June 2025 Grade 12 1.4 Consider the organic reaction below. X+Y CO2 + H2O What is represented by X and Y? A Haloalkane and oxygen B Hydrocarbon and oxygen C Oxygen and esters D Hydrocarbon and haloalkane (2) 1.5 Which of the following are examples of intrinsic and extrinsic semiconductor? INTRINSIC EXTRINSIC SEMICONDUCTOR SEMICONDUCTOR A Silicon Arsenic B Phosphorous Arsenic C Silicon Germanium D Phosphorous Germanium (2) [10] Copyright reserved Please turn over

Technical Sciences/P2 5 NW/June 2025 Grade 12 QUESTION 2 (Start on a new page.) Consider the following organic molecules represented by letters A to F. A B Pent-3-ene [ C CH3CH(OH)CH2CH3 D 2-methylpropan-2-ol E F 2.1 Define the following terms: 2.1.1 Hydrocarbon (2) 2.1.2 Functional group (2) 2.2 Write down the letter (s) that represent (s) the following: 2.2.1 Hydrocarbon (2) 2.2.2 An ester (1) 2.2.3 A carbonyl group (1) 2.2.4 Chain isomers (2) 2.3 Give the IUPAC name of the following compounds: 2.3.1 C (2) 2.3.2 E (2) 2.3.3 F (2) Copyright reserved Please turn over

Technical Sciences/P2 6 NW/June 2025 Grade 12 2.4 Write down the GENERAL FORMULA for the following compounds: 2.4.1 E (1) 2.4.2 F (1) 2.5 Give the STRUCTURAL FORMULA of: 2.5.1 B (2) 2.5.2 the positional isomer of C (2) 2.6 Define the term polymer. (2) 2.7 Write down the NAME of the polymer that is formed by the monomers of compound B. (1) [25] Copyright reserved Please turn over

Technical Sciences/P2 7 NW/June 2025 Grade 12 QUESTION 3 (Start on a new page.) Three compounds are used to investigate ONE of the factors that influences boiling point. The table below shows the results obtained. COMPOUND MOLECULAR MASS BOILING POINT (°C) A Propane 56 -0,5 B Butan-1-ol 58 98 C Ethanoic acid 58 116 3.1 Define the term vapour pressure. (2) 3.2 Is compound B a PRIMARY, SECONDARY or TERITARY alcohol? (2) Explain the answer. 3.3 Write the TYPE OF INTERMOLECULAR FORCE present in the following compounds: 3.3.1 A (1) 3.3.2 B (1) 3.4 Which ONE of compounds A, B or C will be a gas at room temperature? (1) 3.5 Give the NAME of the compound with the LOWEST vapour pressure. (1) 3.6 Explain the answer to QUESTION 3.5 by referring to the ` INTERMOLECULAR FORCES. (2) 3.7 Define the term chain isomer. (2) 3.8 Give the STRUCTURAL formula of the chain isomer of compound B. (2) [14] Copyright reserved Please turn over

Technical Sciences/P2 8 NW/June 2025 Grade 12 QUESTION 4 (Start on a new page.) The flow diagram below illustrates different organic reactions using But-2-ene as the starting reactants. Study the flow diagram and then answer the questions that follow. 4.1 Write the TYPE of addition reaction represented by: 4.1.1 Reaction 2 (1) 4.1.2 Reaction 3 (1) 4.2 What type of reaction is hydrolysis? (1) 4.3 Give the IUPAC name of the following compounds: 4.3.1 A (1) 4.3.2 B (1) 4.3.3 Secondary alcohol D (1) 4.4 Write down the reaction conditions of the following reactions: 4.4.1 Reaction 1 (1) 4.4.2 Reaction 2 (1) 4.5 Give the STRUCTURAL formula of compound C. (2) 4.6 Use STRUCTURAL FORMULAE to write down a balanced chemical (3) equation for Reaction 1. Copyright reserved Please turn over

Technical Sciences/P2 9 NW/June 2025 Grade 12 4.7 Prop-2-ene (C3H6) reacts with excess oxygen. Write the: 4.7.1 Type of reaction taking place (1) 4.7.2 Balanced chemical equation for this reaction (3) 4.8 Name ONE application in the technical industry where this type of reaction in QUESTION 4.7 can be found. (1) [18] Copyright reserved Please turn over

Technical Sciences/P2 10 NW/June 2025 Grade 12 QUESTION 5 (Start on a new page.) Doping is the process of adding impurities to intrinsic semiconductors. Study the diagram below and answer the questions that follow. 5.1 Define the following terms: 5.1.1 Semiconductor (2) 5.1.2 Intrinsic semiconductor (2) 5.2 Explain the connection of a FORWARD biased p-n junction diode. (2) 5.3 Give TWO examples of semiconductors. (2) [8] TOTAL: 75 Copyright reserved

Technical Sciences/P2 1 NW/June 2025 Grade 12 DATA FOR TECHNICAL SCIENCES GRADE 12 PAPER 2 GEGEWENS VIR TEGNIESE WETENSKAPPE GRAAD 12 VRAESTEL 2 TABLE 1/TABEL 1: PHYSICAL CONSTANTS/FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Standard pressure 5 Standaarddruk pƟ 1,01 x 10 Pa Standard temperature Standaardtemperatuur TƟ 273 K/0 °C TABLE 2/TABEL 2: FORMULAE/FORMULES Emf/Emk Ecell = E athode − Eanode / E el = E atode − Eanode c s k or/of Ecell = Ereduction − Eoxidation / Esel = Ereduksie − Eoksidasie or/of Ecell = Eoxidising agent − Ereducing agent / Esel = Eoksideermiddel − Ereduseermiddel Copyright reserved Please turn over

Technical Sciences/P2 2 NW/June 2025 Grade 12 Copyright reserved