# PHYSICAL SCIENCES SCHOOL-BASED ASSESSMENT EXEMPLARS CAPS GRADE 12 TEACHER GUIDE

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1 PHYSICAL SCIENCES SCHOOL-BASED ASSESSMENT EXEMPLARS CAPS GRADE 12 TEACHER GUIDE i

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3 PHYSICAL SCIENCES SCHOOL-BASED ASSESSMENT EXEMPLARS FOR PRACTICAL WORK ALLIGNED TO CAPS GRADE 12 TEACHER GUIDE 1

4 CONTENTS 1. Introduction 3 2. Objectives 3 3. Assessment Tasks for Grade 12 Practical Work 5 4. Quality Assurance Process 5 5. Exemplars of Practical Work as Formal Assessment Tasks Term 1 Preparation of esters and smell identification Term 2 Conservation of linear momentum Term 3 Electricity and magnetism Part 1 15 Determine the internal resistance of a battery. Part 2 17 Set up a series-parallel network with known resistor. Determine the equivalent resistance using an ammeter and a voltmeter and compare with the theoretical value. 6. Memorandum Esters and smell identification Conservation of linear momentum Electricity and magnetism Part 1 22 Internal resistance of a battery Part 2 24 Equivalent resistance of a series-parallel network 2

7 3. ASSESSMENT TASKS FOR GRADE 12 PRACTICAL WORK The table below lists the prescribed formal assessment activities for practical work and the weighting for the annual SBA. TERM 1 PRESCRIBED PRACTICAL ACTIVITIES FOR FORMAL ASSESSMENT EXPERIMENT (CHEMISTRY) The preparation of esters and smell identification WEIGHTING 15% of annual SBA 2 EXPERIMENT (CHEMISTRY) How do you use the titration of oxalic acid against sodium hydroxide to determine the concentration of the sodium hydroxide? OR EXPERIMENT (PHYSICS) The conservation of linear momentum 15% of annual SBA 3 EXPERIMENT (PHYSICS) Part 1 Determine the internal resistance of a battery. Part 2 Set up a series-parallel network with a known resistor. Determine the equivalent resistance using an ammeter and a voltmeter and compare it with the theoretical value. 15% of annual SBA NOTE: REFER TO THE PROGRAMME OF ASSESSMENT FOR GRADE 12 IN THE CAPS DOCUMENT [Page 148] 4. QUALITY ASSURANCE PROCESS A team of experts comprising teachers and subject advisors from the provinces was appointed by DBE to develop and compile assessment tasks. This panel of experts spent a period of four days at the DBE developing tasks based on guidelines and policies. Moderation and quality assurance of the tasks were undertaken by national and provincial examiners and moderators. The assessment tasks were further refined by the national internal moderators to ensure that they are in line with the CAPS document. The purpose of this document is to provide both educators and learners with a set of standardised school-based assessment (SBA) tasks. It contains useful information and guidelines in the form of exemplars. 5

8 5. EXEMPLARS OF PRACTICAL WORK AS FORMAL ASSESSMENT TASKS TERM 1: PRACTICAL WORK KNOWLEDGE AREA: MATTER AND MATERIALS 5.1 PREPARATION OF ESTERS AND SMELL IDENTIFICATION Introduction Esters have a very fruity smell. Naturally occurring esters are found in fruits. Esters can be synthesised by the reaction of a carboxylic acid and an alcohol. This reaction is known as esterification. This reaction can be catalysed by concentrated sulphuric acid. Aim Produce different esters by using a range of carboxylic acids and alcohols. Identify the esters formed by their smell. Apparatus Safety goggles Test tubes Dropping pipettes 250 ml beaker Test tube rack Bunsen burner Heat resistant mat/tile Tripod Wire gauze Retort stand Chemicals: methanol, ethanol, propanol, ethanoic acid, salicylic acid, sulphuric acid and 0,5 mol.dm -3 sodium carbonate 6

9 Method 1. Place 1 drop of concentrated sulphuric acid in a test tube. 2. Add 10 drops of ethanoic acid in the same test tube. 3. Add 10 drops of ethanol to the mixture. PREPARE A WATER BATH 1. Pour about 100 cm 3 of water into the 250 cm 3 beaker. 2. Carefully lower the tube into the beaker so that it stands upright. 3. Heat the beaker gently on a tripod and gauze until the water begins to boil, and then stop the heating. 4. Stand for 1 minute in the hot water. If the mixture in the tube boils, use the tongs to lift it out of the water until the boiling stops, and then return it to the hot water. 5. After 1 minute, carefully remove the test tube and allow it to cool. 6. When cool, pour the mixture into a test tube half-full of 0,5 mol.dm -3 sodium carbonate solution. There will be some effervescence. Mix well. A layer of ester will separate and float on top of the aqueous layer. CAUTION! DO NOT PUT YOUR NOSE NEAR THE TOP OF THE TEST TUBE!!! Wafting is a technique of using your hand to draw air over the opening of a container in the direction of your nose. Air mixed with the substance is drawn into your nose so that the smell from the original substance is diluted. 7. Smell the product by gently wafting the odour towards your nose with your hand. 8. Repeat steps 1 to 10 but use METHANOL and PROPANOL as the alcohol. 9 Repeat steps 1 to 10 but use SALICYLIC ACID and METHANOL. 7

10 10. Results AND INTERPRETATION of results Complete the tables below. Choose ONE of the following to identify the ester formed by smell: Paint Pear Pineapple Strawberry Ice cream Nail polish remover Wintergreen EXPERIMENT 1: ETHANOL + ETHANOIC ACID SMELL WORD EQUATION STRUCTURAL FORMULA CHEMICAL EQUATION BALANCED CHEMICAL EQUATION (16) EXPERIMENT 2: METHANOL + ETHANOIC ACID SMELL WORD EQUATION STRUCTURAL FORMULA CHEMICAL EQUATION BALANCED CHEMICAL EQUATION (16) 8

11 EXPERIMENT 3: PROPANOL + ETHANOIC ACID SMELL WORD EQUATION STRUCTURAL FORMULA CHEMICAL EQUATION BALANCED CHEMICAL EQUATION (16) EXPERIMENT 4: METHANOL + SALICYLIC ACID SMELL (2) discussion of results 1. Which property of sulphuric acid makes it suitable to use as a catalyst for the preparation of esters? (2) 2. Why do we heat the test tube in a water bath and not directly over a flame? (2) 3. With reference to the characteristic smells of esters, name TWO examples where esters are used in different industries. (4) 9

12 4. Why do esters with higher molecular weight not have strong fragrances? (2) TOTAL: 60 TERM 2: PRACTICAL WORK KNOWLEDGE AREA: MECHANICS 5.2 CONSERVATION OF LINEAR MOMENTUM INTRODUCTION The momentum of an object is determined by two variables, namely mass and velocity. Linear momentum (momentum in a straight line) can be defined as the product of mass and velocity. The verification of the conservation of momentum can be determined experimentally during an explosion and a collision. aim To verify the conservation of linear momentum during a simulated explosion. Apparatus Trolley track Trolleys Meter ruler Buffers/barrier (wooden plank or brick or metal) METHOD 1. Place two trolleys, one of which contains a compressed spring, against each other on a smooth, horizontal floor. 2. Place another trolley on top of one of the trolleys in Step 1. These two trolleys now represent a mass of 2 m, while the single trolley represents a mass of m. 3. Place two sturdy wooden planks as barriers on either side of the track (not further than1-1.5 m from the centre of the track) as shown in the diagram below. 4. Release the spring of one trolley so that the two trolleys move apart. Listen to the sound of the collisions against the barrier/buffer. The trolleys hit the wooden planks at different times, because one trolley moves more slowly than the other one (different velocities). 10

13 5. By means of trial and error, find a position from which the trolleys move so that both trolleys will hit the wooden planks on both sides at the same time. Only a single collision should be heard. 6. Measure the distances x 1 and x 2 that each trolley moved from the starting point to the wooden plank. These distances are used as a measure of the velocities of the two trolleys in this experiment. 7. Repeat the above procedure to obtain two more sets of values. RESULTS Complete the following table. Mass (Trolley unit) Trolley system 1 Trolley system 2 [Velocity v 1 ] Momentum Mass [Velocity v 2 ] Distance (trolley Distance ( unit ) x 1 (cm) unit) x 2 (cm) Momentum ( unit ) Total momentum after explosion ( unit ) (10) interpretation and discussion of results 1. Formulate an investigative question for this practical activity. (3) 2. State the law of the conservation of linear momentum. (2) 11

14 3. Explain why the distances travelled by the trolleys can be used as a measure of their velocities. (2) 4. Give a reason why this experiment must be performed more than once. (2) CONCLUSION 5. Draw a conclusion from the results you obtained. (3) EVALUATION 6. What recommendations can you make to improve the results of your experiment? (4) APPLICATION 7. A boy with a mass of 50 kg and a girl with a mass of 40 kg are standing on skateboards. They press their hands together and push each other apart as shown in the sketch. The girl moves to the right at 1 m.s What is the total momentum of the boy and girl before they move apart? (2) 12

15 7.2 Determine the velocity of the boy directly after they moved apart. (5) 13

16 ALTERNATIVE METHOD LINEAR AIR TRACK A collision instead of an explosion can be used to investigate the conservation of momentum. The diagram below illustrates the collision of trolleys on an air track. Trolley A with a mass of 2 kg and velocity of 1,5 m.s -1 to the right collides with a stationary trolley B with a mass of 1,5 kg. After the collision trolley A moves at 0,75 m.s -1 to the left and trolley B moves at 3 m.s -1 to the right. INTERPRETATION OF RESULTS 8.1 In the verification of the conservation of momentum, why is it better to make use an air track rather than a trolley system? (2) 8.2 Prove with a calculation that the momentum was conserved during this collision. (5) TOTAL: 40 14

17 TERM 3: PRACTICAL WORK KNOWLEDGE AREA: ELECTRICITY AND MAGNETISM 5.3 DETERMINE THE INTERNAL RESISTANCE AND THE EQUIVALENT RESISTANCE OF A SERIES-PARALLEL NETWORK Introduction The term lost volts refers to the difference between the emf and the terminal voltage. The voltage is not lost. It is the voltage across the internal resistance of the battery, but lost for use in the external circuit. The internal resistance of the battery can be treated just like another resistor in series in the circuit. The sum of the voltages across the external circuit plus the voltage across the internal resistance is equal to the emf: ε = V load + V internal resistance or ε = IR external + Ir rearrange to get: v = -ri + ε in the form y = mx + c where m = -r PART 1 Determine the internal resistance of a battery. aim To determine the internal resistance of a battery APPARATUS Voltmeter (or multimeter) Ammeter (or multimeter) Any size carbon-zinc battery (Choose voltage in relation to the values of the resistors) Battery holder Rheostat Connecting wires Switch 15

18 METHOD Set up the apparatus as shown in the diagram below and determine the ammeter and voltmeter readings for FIVE different rheostat settings. PRECAUTION: Do not keep the switch on too long. It will heat the battery and cause it to run down. 1. RESULTS 1. Set the rheostat to any resistance 2. Take the reading on the voltmeter and ammeter. 3. Repeat step two 5 times (or more) after changing the resistance provided by the rheostat each time. 4. Tabulate the terminal potential difference (volts)- and electric current (amperes) readings obtained from the experiment. (10) interpretation and discussion of results 2. Identify the: 2.1 Independent variable 2.2 Dependent variable 2.3 Control variable (3 x 2) (6) 3. Why do we include a rheostat in the circuit? (2) 4. Draw a graph of the voltmeter readings versus ammeter readings. (8) 5. Is the gradient of the graph positive or negative? Explain. (3) 6. Use the graph to determine the internal resistance of the battery. (4) 7. Which point on your graph represents the emf of the battery? Explain. (4) CONCLUSION 8. Draw a conclusion from the results obtained. (2) 16

19 PART 2 Set up a series-parallel network with known resistors. Determine the equivalent resistance using an ammeter and a voltmeter and compare with the theoretical value. aim To determine the equivalent resistance of a series-parallel network and compare it with the calculated theoretical value Apparatus Three fixed resistors with known values (not too high values) Voltmeter (or multimeter) Ammeter (or multimeter) Battery (choose voltage in relation to the values of the resistors) Battery holder Connecting wires Switch METHOD Set up the circuit as shown in the diagram below. Record the voltmeter and ammeter readings obtained. interpretation and discussion of results 1. From the readings obtained in your experiment, determine the equivalent resistance of the circuit. (4) 2. By using the values of R 1, R 2, R 3, calculate the theoretical value of the equivalent resistance. (5) CONCLUSION 3. Compare the values obtained in 1 and 2 above and draw a suitable conclusion. (2) TOTAL: 50 17

20 6. MEMORANDUM 6.1 PREPARATION OF ESTERS AND SMELL IDENTIFICATION Results AND INTERPRETATION of results EXPERIMENT 1: ETHANOL + ETHANOIC ACID SMELL WORD EQUATION nail polish or (pear) ethanol + ethanoic acid ethyl ethanoate + water STRUCTURAL FORMULA CHEMICAL EQUATION BALANCED CHEMICAL EQUATION C 2 H 5 OH+ CH 3 COOH CH 3 COOC 2 H 5 + H 2 O reactants products balancing (16) EXPERIMENT 2: METHANOL + ETHANOIC ACID SMELL WORD EQUATION paint methanol + ethanoic acid methyl ethanoate + water STRUCTURAL FORMULA CHEMICAL EQUATION BALANCED CHEMICAL EQUATION CH 3 OH + CH 3 COOH CH 3 COOCH 3 + H 2 O reactants products balancing (16) 18

21 EXPERIMENT 3: PROPANOL + ETHANOIC ACID SMELL WORD EQUATION pear propanol + ethanoic acid propyl ethanoate + water STRUCTURAL FORMULA CHEMICAL EQUATION BALANCED CHEMICAL EQUATION EXPERIMENT 4: C 3 H 7 OH + CH 3 COOH CH 3 COOC 3 H 7 + H 2 O reactants products balancing METHANOL + SALICYLIC ACID (16) SMELL wintergreen (2) discussion of results 1. Dehydrating characteristic (2) 2. Many organic compounds are flammable and should not be left near an open flame. (2) 3. Food industry: flavouring of food/sweet/also margarine and preservatives Cosmetics industry: perfumes/lotions Alcohol industry: smell/rum Medicine industry: taste of children s medicine (max 2 x 2) (4) 4. Stronger IMF, higher boiling point, lower vapour pressure (2) TOTAL: 60 19

22 6.2 CONSERVATION OF LINEAR MOMENTUM Results Mass (trolley units) Trolley system 1 Trolley system 2 [Velocity v 1 ] Distance (cm) Momentum ( units ) Mass (trolley units) [Velocity v 2 ] Distance (cm) Momentum ( units ) Total momentum after explosion ( units ) interpretation and discussion of results (10) 1. Is total momentum before explosion equal to total momentum after explosion? (2) 2. The total linear momentum in a closed system remains constant in magnitude and direction. (2) 3. The distance travelled by each trolley can be calculated with the formula x = v t. The times for each trolley to travel their respective distances are the same (they hit the buffers at the same time); therefore the distances can be a measurement of the velocities. (3) 4. To ensure validity of the results. (2) CONCLUSION 5. The total linear momentum before the explosion equal/does not equal the total linear momentum after the explosion. (Depending on the results of the learner) (3) EVALUATION 6. Make sure that the masses of the trolleys are identical. Make sure that the trolleys are at rest before you start your timing. Try to reduce friction (by polishing the track or oiling the wheels of the trolley) Do not round off the measured distances ( + ANY TWO) (4) 20

23 APPLICATION kg.m.s -1 (2) 7.2 Take right as (+) p(before explosion) = p(after explosion) m 1 v i1 + m 2 v i2 = m 1 v f1 + m 2 v f2 0 = (50) v i1 + (40)(1) v i1 = 0,8 m s 1 v i1 = 0,8 m.s -1 in opposite direction from the girl (5) ALTERNATIVE METHOD - AIR TRACK 1.1 The air track has less friction (2) 1.2 p initial = m A v Ai + m B v Bi = (2)(1,5) + 0 = 3 kg.m.s -1 p final = m A v Af + m B v Bf = (2)(-0,75) + (1,5)(3) = 3 kg.m.s -1 Momentum before the collision is equal to the momentum after the collision. (5) TOTAL: 40 21

24 6.3 ELECTRICITY AND MAGNETISM PART 1: DETERMINE THE INTERNAL RESISTANCE OF A BATTERY. results 1. Table for results obtained during experiment 1 TERMINAL POTENTIAL DIFFERENCE (VOLTS) ELECTRIC CURRENT (AMPERES) CRITERIA FOR MARKING THE TABLE Suitable number of columns and rows as dictated by variables Suitable heading on the columns Correct units for items/quantities recorded in columns Correct sets of values of quantities under investigation (10) interpretation and discussion of results 2. Variables 2.1 Independent: Terminal potential difference 2.2 Dependent: Electric current 2.3 Controlled: Temperature (6) 3. By changing the resistance the flowing current will be changed and the voltage as well. (2) 22

25 4. Graph CRITERIA FOR MARKING THE GRAPH Heading of the graph Acceptable scale on the two axes Correct label of the y-axis Correct unit for the label on the y-axis Correct label on the x-axis Correct unit of the label on the x-axis Correct plotting of points based on captured data Best fitting line (8) 5. Negative. There is decrease in terminal potential difference when electric current increases. (3) 6. Gradient = V Formula I =... Substitution = Answer (4) 7. The y-intercept on the y-axis When the current is zero the terminal potential difference equals the emf, because there is no internal resistance. (4) 23

26 CONCLUSION 8. The stronger the current the greater the drop in terminal potential difference, therefore the higher the internal resistance of the battery. OR The internal resistance can be obtained from the gradient of a potential difference versus current graph. (2) Part 2: DETERMINE THE EQUIVALENT RESISTANCE OF A SERIES-PARALLEL NETWORK interpretation and discussion of results 1. R = V/I Formula =. Substitution = Answer (4) 2. 1 /R // = 1/R 2 + 1/R 3 Formula =... Substitution R // = R T = R 1 + R // Formula = +. Substitution = Answer (5) CONCLUSION 3. There is a difference in the values of question 1 and 2 because of the internal resistance of the battery. OR The theoretical value will always differ from the calculated values. The theoretical value does not take cognisance of internal and external factors. (2) TOTAL: 50 24

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