Physical Sciences Grade 10 P2 2022 Memo

Downloaded from hlayiso.com [Downloaded from Stanmorephysics.com accra] Province of the EASTERN CAPE EDUCATION GRADE 10 MARKS: 100 TIME: 2 HOURS This question paper consists of 13 pages, including 2 data sheets

Downloaded from hlayiso.com Downleaded2 from Stanmoaephyasios.com October 2022 INSTRUCTIONS AND INFORMATION 1. 2. 10. 11. 12. Write your FULL NAME and SURNAME on the ANSWER SCRIPT. The question paper consists of 8 questions. Answer ALL the questions in the ANSWER SCRIPT. Start EACH question on a new page in the ANSWER SCRIPT. Number the answers correctly according to the numbering system used in this question paper. Leave ONE-line open between two sub-questions for example ween QUESTION 2.1 and QUESTION 2.2. oS: You may use a non-programmable calculator. 9) You may use appropriate mathematical instrume ) You are advised to use the attached DATA steers Show ALL formulae and substitutions iat calculations. Round off your final numerical ans\lers to a minimum of TWO decimal places. Give brief explanations, motivations, et cetera where required. Write neatly and eo Ke or & ee

Downloaded from hlayiso.com Downleaded2 from Stanmoaephyasios.com October 2022 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 to 1.7) in the ANSWER BOOK, e.g. 1.11 E. Each question has only ONE correct answer. 1.1 1.2 Which one of the following is a mixture? A Diamond B Distilled water Cc Vinegar @ D. Sodium chloride ew (2) The heating curve (not drawn to scale) of a compound ishdwn below. wv Temperature (°C) 300 RS Time(s) What would be the Xda state of the substance at 100°C ? A. Solid @ B. Liqui > Cc. Ga: w one to liquid (2)

Downloaded from hlayiso.com Downleaded2 from Stanmoaephyasios.com October 2022 1.3 When atom X of an element in Group17 (VII) ionises to become X° the... A mass number of X increases. B atomic number of X decreases C number of electrons decreases D number of electrons increases (2) 1.4 The molecular formula of a certain carbon compound is Ca Hio O2. Which one of the following can be the empirical formula of this compound? A C2HeO B C2HaO2 C C2HsO D C2HeOz (2) 1.5 Which one of the following elements has the highest ionisation energy? A Potassium B Lithium C Caesium D Sodium (2) 1.6 Which one of the following statements is correct? 1 mole is equal to... i) 44g of COz ii) 32g of O2 iii) 14g of N2 A. i andiii B. iandii C iii D_ i,ii and iii (2)

1.7 Consider the Aufbau diagram of an element below. Downloaded from hlayiso.com Dewnleaded2 from Stanmosmepbyaias.com NM 3s MN IM 2p NY) 2s NY) 1s The element is a/an... A. halogen B. noble gas C. alkali metal D. alkaline-earth metal. October 2022 (2) [14]

Downloaded from hlayiso.com Downleaded2 from Stanmoaephyasios.com October 2022 QUESTION 2 The graph below shows the heating curve of a pure substance under standard pressure. 80 60 Temperature (°C) 40 30 20 t (min) -20 -40 2.1 Define the term temperature. (2) 2.2 What is the boiling point of this substance? (1) 2.3. During which time interval/s will the ... 2.3.1 forces of attraction between the particles be at their weakest? (1) 2.3.2 particles vibrate at their fixed positions (1) 2.3.3 average kinetic energy of the particles remains the same (2) 2.3.4 Give a reason for your answer ion 2.3.3 (2) [9]

Downloaded from hlayiso.com Dewnleaded2 from Stanmosmepbyaias.com QUESTION 3 3.1 3.2 3.3 An element X has two isotopes. The percentage abundance and atomic masses are given below. Percentage abundance | Atomic mass Isotope -1| 60.4% 69.5252 Isotope -2 | 39.6 % 70.9249 3.1.1, 3.1.2 3.1.3 Define the term isotope. October 2022 Calculate the relative atomic mass of element X. Write down the symbol for element X The number of protons and electrons, the mass number and the atomic number of Aluminium (Al) and its ion Al?* are shown in the table below. Some of these values in the table have been omitted. Write down the letters (a-e) on the ANSWER BOOK and next to each letter the number omitted. NUMBER OF NUMBER OF MASS ATOMIC PROTONS ELECTRONS NUMBER NUMBER Al 13 (a) 27 (b) Al (c) (d) (e) 13 The sp notation of an unknown element X is shown below. 1s72s?2p°3s73p® For element X, write down the: 3.3.1 3.3.2 3.3.3 3.3.4 Number of valence electrons. Period where this element is found on the periodic table. Highest energy level in which electrons occur. Symbol (2) (3) (1) (6) (1) (1) (1) (1)

Downloaded from hlayiso.com Downleaded2 from Stanmoaephyasios.com October 2022 3.4 Write down the type of bond that forms between Chlorine and Aluminium (1) 3.5 Draw the Aufbau diagram for Chloride ion (CI). (3) 3.6 Draw Lewis dot diagram to show the bond formation between Aluminium and Chlorine (4) [23]

Downloaded from hlayiso.com Downleaded2 from Stanmoaephyasios.com October 2022 QUESTION 4 41 4.2 4.3 4.4 A section of the periodic table is shown below. H He Li | Be C IN O |} F |Ne Na| Mg Al Si cl | Ar K | Ca | Transition metals Write down the SYMBOL as shown above, of the element that .. 4.1.1. is an alkaline earth metal in period 3 (1) 4.1.2 will form a anion with a charge of -2 (1) 4.1.3 has the smallest atomic radius (1) 4.1.4 has the highest electro negativity (1) 4.1.5 is a metalloid (1) The electron affinity of chlorine (Cl) is 349 kJ-molt. 4.2.1 Define the term ‘electron affinity’. (2) 4.2.2 The electron affinity of element Cl can be represented by the following incomplete equation: Clg) +... > «+ 400 kJ-molt Copy the equation above into the ANSWER BOOK and complete it by filling in the blank spaces. (2) Atoms of Francium (Fr) have the lowest energy required to remove an electron from its atom to form positive ions. Write down ONE word or term for the underlined phrase. (1) Write down the formula of the compound formed when: 4.4.1 Li combines with O (2) 4.4.2 Ca combines with F (2) [14]

Downloaded from hlayiso.com Downleaded2 from Stanmoaephyasios.com October 2022 QUESTION 5 Consider the following reaction: 4Cus) + 02g) ———> 2Cu20¢) 5.1 Write down the chemical name of Cuz2O. (2) 5.2 Classify the above reaction as synthesis or decomposition reaction (1) 5.3. Using a calculation prove that the law of conservation of mass is valid for the above reaction. (3) 5.4 20g of Cu completely react with 250cm* of hydrochloric acid solution of unknown concentration according to the following balanced equation. Cu (s) + 2HCI (ag) ———— CuCle (aq) + Hag) 5.4.1 Define the term concentration. (2) 5.4.2 Calculate the concentration of the hydrochloric acid solution. (6) [14] QUESTION 6 During a demonstration to show the difference between physical and chemical change, the following experiments are carried out: Experiment 1: Iron filings are heated with sulphur Experiment 2: Iron filings are mixed with sulphur powder 6.1 Which one of the above experiments is an example for a chemical change? Experiment 1 or 2? 6.2 Give a reason for your answer in 6.1 6.3 6.4 Write down a balanced equation for the change in experiment 2. Name a method to reverse the change in experiment 2? 10 (1) (1) (3) (1) [6]

Downloaded from hlayiso.com Downleaded2 from Stanmoaephyasios.com October 2022 QUESTION 7 The formation of sulphur trioxide (SOs) is represented by the following balanced equation. 2 SO2(g) + O2(g) > 2SOs (g) 7.1 » Identify the element in the above equation (1) 7.2 Draw the Lewis dot diagram of the oxygen molecule (O2). (2) 7.3. During the above reaction 10 g O2 (oxygen) react completely with Sulphur dioxide (SOz). Calculate the: 7.3.1 Number of moles of O2 reacted (3) 7.3.2 Theoretical yield of SOs (g) (4) 7.3.3 Percentage yield if 40g of SOs is produced at the end of the reaction. (3) [13] QUESTION 8 An inorganic compound has the following percentage composition.43.39% Sodium (Na), 11.32% Carbon (C) and 45.28% Oxygen(O) 8.1 Define the term empirical formula. (2) 8.2 Determine the empirical formula of this compound. (5) [7] TOTAL:100 a1

Downloaded from hlayiso.com Dewnleaded2 from Stanmosmepbyaias.com October 2022 TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Avogadro’s constant Na 6,02 x 1023 mol Avogadro-konstante TABLE 2: FORMULAE/TABEL 2: FORMULES c= <|35/2/3 orlof c= im MV 12

Downloaded from hlayiso.com Downleaded2 from Stanmoaephyasios.com October 2022 () (ly ay (yy) Ot) 1 Atomic number f2.| KEY/SLEUTEL _H SLEU' Atoomgetal He “4 a 4 3 4 Ss 5 6 7 ca) 10 . Electronegativity Symbol oli |,Be Etektronegatiwiteit 7 CU }-Simboo! eB »C |.N .O QF | Ne v7 |-9 63,5 st 42 |g te 19 | 20 mW | 12 vatbe ao 13/14 | 15 | 16 | 17 *| 18 oNa ly Mg Approximate relative atomic mass wAe |.Si P |S Ce | Ar 323 \K24 Benaderde relatiewe atoommassa “27 |-28 534 132 935, 5) 40 19 | 20 | 24 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 34 | 32 | 33 | 34 | 35 | 36 aK |,Ca Sc |,Ti .V |_Cr |.,Mn|,Fe |,Co Ni |,Cu |.Zn |.Ga |,Ge |.As ,Se Br | Kr 239 |-40 (45 (mas i514 (“52 |-55 |rs6 |s9 [59 |-63,5\-65 (“70 (“73 |N75 [N79 N80 | 84 37 | 38 | 39 | 40 | 44 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49: «| 50 | 541 | 52 | 53 | 54 e@Rb |,Sr ,Y (Zr Nb |,Mo |,Tc |,Ru |yRh Pd |,Ag |.Cd j.In |.Sn |,Sb _Te | Xe ese |-ss a9 91 | 92 [96 [F101 |N103 S406 |-408 [112 [4145 [149 [122 S128 127 | 134 55 | 66 | 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 |,T@ |.Pb |,Bi Po |,At | Rn 2133 |9137_| 139 |179 | 181 | 184 | 186 | 190 | 192 | 195 | 197 | 201 [204 “207 |r209 [NN 87 | 88 89 5 Fr je. Ra Ac 58 [59 «[60 «[61 [62 [63 [64 [65 [66 |é7 [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 61 62 83 64 95 6 7 98 99 00 401 102 [103 Th Pa UU Np |Pu Am (Cm Bk (Cf Es Fm Md No Lr 232 238 13

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com Province of the EASTERN CAPE EDUCATION OR TAMBO INLAND DISTRICT GRADE 10 MARKS: 100 These marking guidelines consists of 6 pages.

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com QUESTION 1 1.1 C¥v 1.2 BYY 1.3 D¥vv 1.4 Cv¥v 15 BYY 16 BYY 1.7 D¥vv [14] QUESTION 2 2.1 Measure of the average kinetic energy of the particles in a substancev ¥ (2) 2.2 30°CV (1) 2.3.1 30-40 minutes v (1) 2.3.2 0-5 minutes Vv (1) 2.3.3 5-10V and 20-30 minutes v (2) 2.3.4 During a phase change the heat energy supplied is used to overcome the intermolecular forces.“ Therefore the average kinetic energy of the particles remains the same. ¥ (2) [9] QUESTION 3 3.1.1 Atoms with the same atomic number ~ but different mass number.” (2) 3.1.2 Relative atomic mass = (69.5252 x 60.4) ¥+ (70.9249 x 39.6) v 100 = 70.08 (3) 3.1.3 Gav (1) 3.2 a) 13v (1) b) 13” (1) c) 13v (1)

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com d) 10v (1) e) 27¥ (1) 3.3.1 BY (1) 3.3.2 Period -3 ¥ (1) 3.3.3 3v (1) 3.3.4 Arv (1) 3.4 lonic bond ¥ (1) 3.5 tty ty) | v tytyty in | L (fy) (3) 1 3.6 Al» ¥ +3 “cl? ¥———> Al**v+ 3 | v (4) [23]

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com QUESTION 4 4.1.1 Mgv 41.2 Ov 4.1.3 Hv 4.1.4 FY 4.1.5 Siv (5) 4.2.1. Energyseleased when an electron is added to an atom in the gaseous State to form an anion. vv (2) 4.2.2 Chtev—s Cl +349kJ molt v (2) 4.3 lonisation energy “ (1) 4.4.1 LiO0 vv (2) 4.4.2 CaFovv (2) [14] QUESTION 5 5.1 Copper(!) oxide. VY” (2) 5.2 Synthesis reaction “ (1) 5.3 (4x 63.5) + (2x16) Y = (4 x 63.5) + (2 x16) ¥ 286 g.molt = 286g.mol! v (3) 5.4.1 Number of moles of the solute per litre of the solution. vw (2) 542 n= m = 20 ¥ = 0.3149 mole Mv 63.5 n (HCl) = 2 x 0.3149 = 0.6299 mole ¥ c= ne v v c= 06299 Y = 259moldm? v 0.25 (6) [14]

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com QUESTION 6 6.1 Experiment 1 ¥ 6.2 New substances are formed v/ Bonds are broken and new bonds are formed 6.3 Fe()+S ()“— ”_ FeS ¥ Balancing “ 6.4 Separate the iron filings using a magnet” QUESTION 7 7.1 OQov 7.2 02° 6 6 valence electrons ¥ 0° 00 . . Sharing 2 pairs ¥ 7.3.1 n = v=10 VY = 0.3125 moles v m — “ 32 7.3.2 n (SOs) produced = 2x 0.3125” = 0.625 moles m (SOs) produced nx MY = 0.625 X 80Y = 50g ¥ 7.3.3 % yield= Actual yield x 100 Y= 40 x 100 Y= 80%VY Theoretical yield 50 (1) (1) (3) (1) [6] (1) (2) (3) (4) (3) [13]

Downloaded from Stanmorephysics.com Downloaded from hlayiso.com QUESTION 8 8.1 The simplest whole number ratio of elements in a compound. Vv” (2) 8.2 Element | g/100g n=m/M Simplest ratio Na 43.39 43.39 | 23 = 1.8867” 2°74 c 11.32 11.32 /] 12 = 0.9433 v 1 > oO 45.28 45.28 | 16 = 2.83 v 3 JU Empirical formula is NazCOs ¥ [TOTAL 100 MARKS] (5) [7]