Physical Sciences Grade 12 Paper 2 KZN March 2017 Memo

Downloaded from hlayiso.com Education KwaZulu-Natal Department of Education REPUBLIC OF SOUTH AFRICA PHYSICAL SCIENCES P2 (CHEMISTRY) COMMON TEST MARCH 2017 NATIONAL SENIOR CERTIFICATE TIME: 1 hour 50 This question paper consists of 6 pages. MS

Physical Sciences P2 Downloaded from hlayiso.com a) March 2017 Common Test NSC : INSTRUCTIONS AND INFORMATION 1. Answer ALL the questions. 2. You may use a hon-programmable calculator. 3. . You may use appropriate mathematical instruments. ° 4, Number the answers correctly according to the numbering system used in this question paper. . ; 5. Give brief motivations, discussions, et cetera where required. 6. Round off your final numerical answers to a minimum of TWO decimal places. Copyright reserved Please turn over

Physical Sciences P2 3 Downloaded from hlayiso.com NSC QUESTION 1: MULTIPLE CHOICE Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Write only the letter (A - D) next to the question number (1.1 — 1.3) in the ANSWER BOOK, for example 1.1 D. 4.1 Which one of the following statements best describes why butane is March 2017 Common Test non-polar? A Butane contains oniy single bonds between atoms. B Butane has an even number of carbon atoms. Cc Butane is a linear molecule hence is symmetrical. D The electronegativity difference between C and H atoms is so small as to be considered non-polar. 1.2. Which ONE of the following statements is CORRECT? Alkynes ... A have the general formula C,H... B are unsaturated hydrocarbons. Cc readily undergo substitution reactions. D have one double bond between two carbon atoms. 1.3. Which one of the following reaction types describes the conversion of ETHANE to ETHENE? A Hydrogenation B Substitution Cc Dehydrogenation D Addition Copyright reserved MS (2) (2) [6] Please turn over

Physical Sciences P2 QUESTION 2 Downloaded from hlayiso.com 4 NSC March 2017 Common Test The letters A to H in the table below represent eight organic compounds. ° ° ae! CH,C(CH,), CH,CH(CH,) CH, HEE EEE H H H HH CH,CH, CH, C(CH,)CH, E F H Br Cl [. H—C—O—H H,C-—- CH-—CH,— CH 2 2 2 4 4 Cl | | TP H H oH HEC EH CH,CH,CO,H H H | 2.1 Write down the: 2.1.1 Letter that represents a tertiary alcohol. (1) 2.1.2 Name of the homologous series to which compound G belongs. (1) 2.1.3 Letter of the compound that represents a saturated hydrocarbon. (1) - 2.1.4 IUPAC name of compound B. (2) 2.1.5 IUPAC name of compound E. (2) 2.2 Compound H has two (2) isomers. 2.2.1. Write down the structural formula of one of the isomers of (2) compound H. 2.2.2 Write down the [\UPAC name of the other isomer of compound H. (NOT the compound identified in 2.2.1) (2) 2.2.3 What type of isomers are these in relation to compound H? (1) Copyright reserved M5 [12] Please turn over

Downloaded from hlayiso.com 5 Physical Sciences P2 March 2017 Common Test Nsc QUESTION 3 3.1 Study the flow diagram below, which represents various organic reactions, and answer the questions that follow. H NaOH (aq)/Heat | | Compound C —ct— p (im) Cc 1 H H Conc. NaOH in Ethanol/ Conc. NaOH in Ethanol/ leat Major Product Minor Product Compound A Compound B H,SO, (conc) (I) H, oO Compound D 3.1.1. Give the IUPAC name of compound B. (2) 3.1.2 What type of elimination reaction is represented by (I). (1) 3.1.3. Use condensed formulae to write down a balanced equation for | reaction (II). (3) { 3.1.4. Using structural formulae, write down a balanced equation for reaction (IIT). (3) | 3.2 Learners are required to prepare butyl propanoate in the laboratory. The following procedure is followed: | (i) 2 ml of reactant A (organic acid) and 2 ml of the reactant B (alcohol) are placed in a test tube. (ii) | The test tube is then heated in a water bath. 3.2.1. Give the IUPAC name of the alcohol use in this preparation. (2) 3.2.2 Draw the structural formula for the organic acid used in this preparation. (2) 3.2.3 Will the learners be able to smell the product immediately? Give a reason. (2) | 3.2.4 Why is the test tube heated in a water bath and not over an open : flame. (1) | [16] Copyright reserved Please turn over MS

Downloaded from hlayiso.com 6 Physical Sciences P2 NSC QUESTION 4 A group of learners investigated the boiling points of four (4) alcohols. Their results are given in the table below. Name of compound | Boiling points (c) propan—1-ol 97 butan—1--ol 17 pentan—1-—ol 137 hexan—1--ol 157 41 Write down an investigative question for this investigation. 4.2 State one variable, besides atmospheric pressure, that must be kept constant for this investigation. 4.3. Define boiling point. 44 Explain the trend in boiling points in this investigation. 4.5 Which of these alcohols will have the lowest vapour pressure? Give a reason. QUESTION 5 Polymerisation is the formation of macromolecules by the joining together of a large number of monomers. One such process results in the formation of polyethene. 5.1 Define a monomer. 5.2 Name the type of polymerisation that takes place here. 5.3. Draw the structural formula of the monomer of polyethene. 5.4 — Give one use of polyethene. TOTAL MARKS: Relative Atomic Masses C-12 O-16 H-1 Copyright reserved MS March 2017 Common Test (2) (1) (2) (3) (2) [10] (2) (1) (2) (1) [6] [50]

Downloaded from hlayiso.com Physical Sciences P2 2 March 2017 Common Test NSC - Memorandum QUESTION 1: MULTIPLE CHOICE 1.1 C ✓✓ (2) Education 1.2 B ✓✓ (2) KwaZulu-Natal Department of Education 1.3 C✓✓ (2) REPUBLIC OF SOUTH AFRICA [61 ·� ··:·•, ,�.- :: :�· ·'. - · �· .- �. � .�,.-:. -�-:�r::·�tr:-,T:·-�-:-,.,:::7.::�/7:{f:·r:"0,::�·t:;::",:, r_: �,�" QUESTION 2 :��-� . PHYSIC Al::,S(;JE . . NCES p2•·c' "' :.•, .... cHEl\ll�� . IBX){. " .. . . . · • · ·· :: 2.1 2.1.1 C✓ (1) II " · . :: . CbMMON TEST 2.1.2 Ketone ✓ 1 ,.. ( ) ,�,,. M�QRANbUrvl:) J . 2.1.3 A✓ 2.1.4 Pentanal ✓✓ 1( ) (2) ·���. x .•. _ .: :·.·I���f� �?��-_ :. �:" �- J .Ju�·•J•:e�:· 2.1.5 2-bromo-1,4-dichlorobutane ✓✓ (2) 2.2.1 H O H H H 0 I I I I II (2) H-C-o-c-C-H✓✓ II OR H-C-C-o-c-H ✓✓ NATIONAL SENIOR CERTIFICATE H I I H I I H H 2.2.2 Ethyl methanoate ✓✓ methyl ethanoate✓ ✓ (2) 2.2.3 Functional group isomers ✓ (1) [121 QUESTION 3 3.1 3.1.1 But-1-ene ✓✓ 2 ( ) TIME: 1 hour 3.1.2 Dehydrohalogenation ✓ 1( ) 3.1.3 H2S04 ✓ MARKS: 50 ✓ CH3CH = CHCH3 + H20 � CH3 CH2 CH(OH) CH (3) Jsalancing 3.1.4 I H H Br H H H O H This memorandum consists of 3 pages. I ! I I I I I ! ✓ H-C-C-C-C-H + NaOH --- H-C-C-C-C-H + Nasr✓ 1 I I I H i I H I H I C3) H H H H H ✓ Balancing Copyright reserved Please tum over

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