Physical Sciences Grade 11 North West June 2017 QP

NATIONAL SENIOR CERTFICATE GRADE 11 PHYSICAL SCIENCES JUNE 2017 MARKS: 150 TIME: 3 hours This question paper consists of 14 pages and 3 data sheets

Physical Sciences 2 NW/June 2017 NSC – Grade 11 INSTRUCTIONS AND INFORMATION 1. Write your name on the ANSWER SHEET. 2. This question paper consists of TWELVE questions. Answer ALL the questions on the ANSWER BOOK. 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 QUESTION 2.1 and QUESTION 2.2 6. You may use a non-programmable calculator. 7. You may use appropriate mathematical instruments. 8. You are advised to use the attached DATA SHEETS. 9. Show ALL formulae and substitutions in ALL calculations. 10. Round off your final numerical answers to a minimum of TWO decimal places. 11. Give brief motivations, discussions, et cetera where required 12. Write neatly and legibly.

Physical Sciences 3 NW/June 2017 NSC – Grade 11 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the letter (A-D) next to the question number (1.1-1.10) in the ANSWER BOOK, for example 1.11 D 1.1 A brick slides on a rough horizontal surface. Which one of the following actions will increase the frictional force acting on the brick? A Decreasing the surface area of contact B Increasing the surface area of contact C Putting a second brick on it D Decreasing the mass of the brick (2) 1.2 The graphs below show the relationship between the net force and the Acceleration for two masses P and Q. Which one of the following statements is true? A The bodies have equal masses B Body P has a smaller mass C Body Q has a smaller mass D The mass does not affect the gradient of the graph (2)

Physical Sciences 4 NW/June 2017 NSC – Grade 11 1.3 Consider a man pressing a book against a wall with a force K as shown in the sketch below: The reaction force to force K will be: A the force with which the wall presses on the book B the force with which the book presses on the wall C the force with which the wall presses on the man D the frictional force between the book and the wall (2) 1.4 The gravitational force exerted by two identical metal spheres P and Q on each other can be represented as shown in the sketch below: Which one of the following diagrams represent the force correctly if the mass of P is doubled? (2)

Physical Sciences 5 NW/June 2017 NSC – Grade 11 1.5 The bond which involves the donation of electrons into an empty orbital is a/an- A Ionic bond B Dative covalent bond C Covalent bond D Metallic bond (2) 1.6 Adhesive forces are found in ……… A surface tension B viscosity C hydrogen bonding D capillary action (2) 1.7 The liquid that exhibit the highest vapour pressure at 25 ºC is: A water, boiling point 100 ºC B ether, boiling point 34,6 ºC C ethyl alcohol, boiling point 78,3 ºC D glycerin, boiling point 290 ºC (2) 1.8 A clear plastic bead has a critical angle of 40º. Light inside the bead strikes the surface with angle of incidence of 42º. At the surface… A all the light is reflected B all the light is transmitted to the air C the light travels along the boundary D some light is reflected and some light is refracted (2)

Physical Sciences 6 NW/June 2017 NSC – Grade 11 1.9 Which one of the following graphs does not represent a gas relationship? (2) 1.10 Which statement regarding the Kinetic Molecular theory of ideal gases is incorrect? A Gas molecules are in random motion B Gas molecules collide inelastically C The gas molecules occupy zero volume D Attractive and repulsive forces can be neglected (2) [20]

Physical Sciences 7 NW/June 2017 NSC – Grade 11 QUESTION 2 2.1 Daniel and Thato are pulling a cement block as shown in the sketch below. Daniel pulls with a force of 100N at a bearing of 50º and Thato pulls with a force of 120 N at a bearing of 130º. 2.1 Explain what is meant by resultant force? (2) 2.2 Calculate the magnitude of the sum of the vertical and horizontal components of the force applied by Daniel and Thato ? (6) 2.3 Calculate the magnitude and direction of the combined pulling force by adding the vector components. (4) [12]

Physical Sciences 8 NW/June 2017 NSC – Grade 11 QUESTION 3 Vusi was pushing a truck with a force of 100 N. The mass of the truck is 1500 kg and the truck is at rest. 3.1 What is the magnitude of the weight of the truck? (2) 3.2 Explain the difference between static and kinetic frictional force (4) [6] QUESTION 4 A supermarket built a ramp for their customers to push their fully laden trolleys to their parked cars in the roof parking area above the supermarket. They completed a survey and found that the average loaded trolley has a mass of 20 kg. The material they used for the ramp resulted in a coefficient of static friction of 0,7. The ramp is inclined at 20º as shown in the figure below. 4.1 Draw a labelled force diagram of all the forces acting on the trolley? (3) 4.2 Calculate the minimum force a person must apply to push the trolley up the ramp (9) [12]

Physical Sciences 9 NW/June 2017 NSC – Grade 11 QUESTION 5 A 10 N force is used to pull a toy train, which has an engine and another cart attached to it, as shown in figure below. The train engine has a mass of 1 kg and the cart has a mass of 500 g. The track is smooth, therefore there is no friction. 5.1 Calculate the acceleration of the train? (4) 5.2 Calculate the tension in the link between the train and the cart. (2) [6] QUESTION 6 An astronaut measures his weight on the Earth. As his spaceship travels away from the Earth, he measures the Earth’s force of attraction on him at various stages. The table below indicates the forces of attraction acting on the man, though not in the same order as they were measured. Study the table below and answer the following questions: Point Earth’s attraction on astronaut(N) P 392 Q 98 R 588 S 784 T 196 6.1 At which point was he on the Earth’s surface? Explain (2) 6.2 At which point was he furthest away from the Earth? (1) 6.3 At which point was he approximately double the Earth’s radius from the centre of the Earth? Explain (2) 6.4 What is the astronaut’s mass in kilograms? (2) [7]

Physical Sciences 10 NW/June 2017 NSC – Grade 11 QUESTION 7 The graph below shows the energy involved in the formation of the carbon-carbon Bond. Use the graph to answer the questions that follow. 7.1 What is the bond energy for the formation of the C-C bond? (1) 7.2 What is the C-C bond length? (1) 7.3 What is the relationship between bond length and bond energy? (1) 7.4 Describe the shape of the graph in sections 1 to 4 on the formation of the C-C bond (4) 7.5 The molecules of both carbon dioxide and water have three atoms each, but they have different molecular shapes. Name the shapes of both and explain the difference by referring to the polarity of the bonds and the molecules. (4) 7.6 Use Lewis structures to show the formation of the following molecules and write the name of each molecular shape. 7.6.1 BeCl2 (2) 7.6.2 PCl5 (2) [15]

Physical Sciences 11 NW/June 2017 NSC – Grade 11 QUESTION 8 8.1 Copy the table given below on your answer book and complete the table Substanc Type of Type of Type of Polar, e particles intramolecular intermolecular nonpolar or force force none NH4Cl CCl4 NH3 (12) 8.2 The table below shows the boiling points and molar masses of the hydrides of group sixteen elements Compound Molar mass(g∙mol-1) Boiling point in(ºC) H2O 18,0 100 H2S 33,06 -61 H2Se 79,96 -41 H2Te 128,60 -2 8.2.1 Draw a graph of boiling point versus molar mass (3) 8.2.2 Explain the trend in boiling points of H2S, H2Se and H2Te (4) 8.2.3 Explain why water has a higher boiling point than all the hydrides of group sixteen elements. (2) [21]

Physical Sciences 12 NW/June 2017 NSC – Grade 11 QUESTION 9 9.1 Define the term Refraction (2) 9.2 The speed of a beam of yellow light travelling through a glass block is found to be 1,97 X 108 m∙s-1 9.2.1 What is the speed of the yellow light when it travels through air? (1) 9.2.2 Determine the refractive index of the glass block? (3) 9.3 A light ray is incident on the face of a triangular glass prism in air, as shown in the diagram below. Copy the diagram on your answer book and draw the path of the ray through the prism and as it emerges from the prism. Include the following labels in your diagram. (Normal, angle of incidence, angle of refraction and refracted ray) (4) 9.4 FOR QUESTION 9.4 USE THE INFORMATION GIVEN IN THE TABLE BELOW. Substance Refractive index Air 1,0 Water 1,33 Perspex 1,5 Glass 1,5 Diamond 2,4 A transparent block lies under water. A diver shines his flash light onto it so that the ray of light makes an angle of 59º on the block. The resulting angle of refraction is 27º. Identify the material that the block is made of. (4) [14]

Physical Sciences 13 NW/June 2017 NSC – Grade 11 QUESTION 10 Monochromatic green light is shown through a very narrow slit A and the image is cast on a screen in a dark room as shown in the sketch below. 10.1 Define the term monochromatic. (1) 10.2 Describe the pattern that is observed on the screen. (2) 10.3 Give the name of this phenomenon and define this phenomenon. (3) 10.4 Name and state the principle that can be used to explain this phenomenon. (3) [9] QUESTION 11 In a class experiment, learners varied the pressure on an enclosed amount of gas, and obtained this set of results with respect to the pressure, volume and temperature. Pressure (kPa) Volume(cm3) Temperature (ºC) 198 25,4 23 158,6 31,71 23 120 X 23 11.1 In this experiment, what is/are the 11.1.1 Independent variable? (1) 11.1.2 Dependent variable? (1) 11.1.3 Controlled variables? (1) 11.2 State an investigation question for the experiment. (2) 11.3 These results illustrate a certain law. Name the law and state it in words (3) 11.4 Show clearly, by means of calculations that the first two sets of readings obey this law. (3) 11.5 Calculate the value of ‘X’ given in the table. (2)

Physical Sciences 14 NW/June 2017 NSC – Grade 11 [13] QUESTION 12 The results obtained during an experiment to investigate the relationship between volume and temperature of a given mass of gas at constant pressure is given below. Volume (cm3) Temperature(ºC) 0,0546 0 0,0746 100 12.1 Make use of a calculation to show that this gas is behaving as an ideal gas. (3) 12.2 State two main assumptions that are made about the particles of an ideal gas. (2) 12.3 Calculate the volume of the given gas at 200ºC. (2) 12.4 Ammonium nitrate decomposes according to the following equation: NH4NO3 (g) → N2O(g) + 2H2O(g) A 2,8 g sample of ammonium nitrate is sealed and then heated in a I dm 3 flask. The ammonium nitrate decomposed completely. 12.4.1 Calculate the total number of moles of gaseous products that form. (5) 12.4.2 If the temperature in the flask 71ºC, what is the pressure in the flask in kPa? (3) [15] TOTAL: 150

Physical Sciences 15 NW/June 2017 NSC – Grade 11 DATA FOR PHYSICAL SCIENCES GRADE 11 PAPER 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 11 VRAESTEL 1 (FISIKA) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Acceleration due to gravity g 9,8 m·s-2 Swaartekragversnelling Universal gravitational constant G 6,67 x 10-11 N·m2·kg-2 Universele gravitasiekonstant Speed of light in a vacuum c 3,0 x 108 m·s-1 Spoed van lig in 'n vakuum Planck's constant h 6,63 x 10-34 J·s Planck se konstante Coulomb's constant k 9,0 x 109 N·m2·C-2 Coulomb se konstante Charge on electron -e -1,6 x 10-19 C Lading op elektron Electron mass me 9,11 x 10-31 kg Elektronmassa Mass of Earth M 5,98 x 1024 kg Massa van Aarde Radius of Earth RE 6,38 x 106 m Radius van Aarde TABLE 2: FORMULAE MOTION v f vi  a t Δx v i Δt  21 at 2 Δy v i Δt  21 at 2 or/of 2 2 2 2  v vf   v vf  v f  v i  2ax or/of v f  v i  2ay Δx  i  Δt Δy  i  Δt  2  or/of  2  FORCE Fnet ma p mv f s max = μ sN fk = μk N w mg m1m 2 M M F =G g =G of g =G 2 d2 or/of d2 r or/

Physical Sciences 16 NW/June 2017 NSC – Grade 11

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) (Il) (ill) (IV) (Vv) (VI) (VII) (VIII) 1 Atomic number 2 - KEY/SLEUTEL SH Atoomgetal He 1 30 4 3 4 a 5 6 7 8 9 10 . Electronegativity Symbol 2 Li |2 Be Elektronegatiwiteit | 2 CU ke 'simbool is a C |S N [3 0 |g Ne 7 9 63,5 11 12 14 16 19 20 11 12 13 14 15 16 17 18 S Na|= M roximate relative atomic mass 2Ae\2 SiG P |G S |S Cce| Ar App 23 24 Benaderde relatiewe atoommassa 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 s K |2 Ca/2 Se |2 Ti 2 V |2 Cr|2Mn|{z Fe [2 Co/® Ni |2 Cu|2 Zn |2 Ga|2 Ge |S As |& Se |S 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 6 Rb\2 Sr|> Y |= Zr| Nb/2 Mo/2 Te|& Ru ja Rh | Pd|2 Ag |= Cd |= In [2 Sn|2 Sb |S Te |e | 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 S$ Cs/Z Ba) La|2 Hf] Ta] WJ Re| Os| Ir) Pt] Au| Hg|2 Te /2 Pb|2 Bi |S Po|Z At); Rn 133 137 139 179 181 184 186 190 192 195 197 201 204 207 209 87 88 89 nt o s Fr js Ra Ac 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