Physical Sciences Grade 10 P2 September Test 2019 QP & Memo

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Downloaded from hlayiso.com Physical Sciences P2 2 September 2019 Common Test Grade 10 INSTRUCTIONS AND INFORMATION 10. This question paper consists of ELEVEN questions. Answer ALL the questions in The ANSWER BOOK. Number the answers correctly according to the numbering system used in this question paper. Leave ONE line between two sub questions, for example between QUESTION 2.1 and QUESTION 2.2. You may use a non-programmable calculator. You may use appropriate mathematical instruments. YOU ARE ADVISED TO USE THE ATTACHED DATA SHEET. Show ALL formulae and substitutions in ALL calculations. Round off your FINAL numerical answers to a minimum of TWO decimal places. Give brief motivations, discussions, et cetera where required. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 3 September 2018 Common Test Grade 10 QUESTION 1: MULTIPLE- CHOICE Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Write down only the fetter (A - D) next to the question number (1.1 — 1.10) in the answer book, for example: 1.11. D. 1.1. Which one of the following DOES NOT define the properties of a metal? (2) A Brittle B Ductile C Malleable D Good conductor 1.2 Liquids which dissolve in ail proportions are said to be ... (2) A Mixture B Miscible C Immiscible D Suspension 1.3 The formula NO* represents a... A_ nitride ion B_ nitrite ion C_ nitrate ion D_ nitrogen oxide 1.4. The process whereby a substance changes from a gas to a liquid, by removal (2) of heat energy is called... A Boiling B_ Evaporation C Sublimation D Condensation 1.5 The bond whereby there is a complete transfer of electron to form cation (2) and anion that attract each other to form a formula-unit is called... lonic Dative Metallic Covalent o00O0> Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 4 September 2019 Common Test Grade 10 1.6 Which one of the following correctly describes the trend in the electronegativity and first ionization energy going down the group 2 elements? ____| Electronegativity First ionization energy _A__| Increase Increase B_| Decrease ___.__| Increase C | Decrease __.__| Decrease D_ilncrease Decrease (2) 1.7. Solid sodium hydroxide was added into a beaker with distilled water. After few seconds an observed rise in temperate was recorded. Which of the following describes this process? Change _| Type of reaction [A | Physical _[Exothermic __ |B | Chemical =| Endothermic _ C |Chemical Exothermic _ D | Physical Endothermic (2) 1.8 A-specific name given to an atom or molecules with additional electron(s) is (2) called a/an ... A lon B Atom Cc Anion D Cation 4.9 | Which of the following has the same electronic configuration as that of neon (2) atom. A si* B Mg?" cc D Si 1.10 Which one of the following reactions can be classified as redox reaction? A Mg** (aq) + O*( (aq) — 2MgO (s) B Cu** (aq) + O* (aq) > CuO (s) ” C Zn(s) + 2HCl(aq) > ZnCle(aq) + He(g) D 2Z2nCle (aq) + CaSO, (aq) - ZnSOg (aq) + CaCla(aq) (2) [20] Copyright reserved Please turn over

Physical Sciences P2 5 Downloaded from hlayiso.com Grade 10 QUESTION 2 It is sometimes necessary to separate a mixture into its components. Four separation methods are summarized in the table below. 2.1 2.2 2.3 2.4 Copyright reserved A Filtering of a muddy-water mixture. B Distillation of water-ethanol to remove water. Ethanol boils at 78°C and water boils at 100°C at sea level. Cc Separation of salt and iron fillings by using a magnet. D Separation of water - sunflower oil mixture by using separating funnel. Classify the following as HETEROGENEOUS OR HOMOGENEOUS 2.1.1 Muddy-water mixture. 2.1.2 Ethanol and water. Name the physical properly used in each of the following separation methods: 2.2.4 C 22.2 D Now consider method B 2.3.1 Which phase change takes place when water boils? 2.3.2 Which one of water and ethanol has weaker forces of attraction between their molecules? Give a reason for the answer. Now, consider method D. 2.4.1. Which liquid forms the top layer in the water-sunflower oil mixture? Give a reason for the answer. 2.4.2 Equal volume of water and sunflower oil have been placed in two separate beakers. Which liquid will have the greater mass? Give a reason for the answer. September 2019 Common Test (2) (2) (3) [15] Please turn over

Downloaded from hlayiso.com Physical Sciences P2 September 2019 Common Test Grade 10 QUESTION 3 3.1 Define sublimation. (2) 3.2 When you take a block of margarine out of the fridge, itis hard. However, after (2) 30 minutes at room temperature it is soft enough to spread. Use kinetic molecular theory to explain this observation? The diagram below, not drawn to scale, shows the physical changes of a substance at atmospheric pressure. - 120 Y xX 85 -----9 2 i g 0 Y E 2 Pl Z Time (s) 3.3 Is the diagram above showing a COOLING or HEATING curve? (1) 3.4 Name phase(s) of the substance at: 3.4.1 Point X (1) 3.4.2 -20°C. (2) 3.5 Write down the stage of this substance at 85 °C. (1) 3.6 Write down the particle arrangement of this substance at: 3.6.1 Point Z (2) 3.6.2 Point Y (2) 3.7 The above substance is not water. By referring to the diagram, explain why this (2) curve does not represent water? 3.8 What happens to the temperature of the substance during a PHASE CHANGE? Write down only INCREASES, DECREASES or REMAINS THE SAME. Give a REASON for the answer. (2) [17] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 7 September 2019 Common Test Grade 10 QUESTION 4 Study the following diagrams and then answer the questions set. Oxygen Nitrogen Hydrogen Carbon A OQ B =) c@ 0 ie CO. | BS Fb .8| OO ogg, co?) eg ook) SS 4.1. Name the substance in B. 4.2 What type of bond exists between atoms in substance A? Explain the answer. 4.3 Name a giant molecule that has carbon atoms ONLY. 4.4 Draw a Lewis dot diagram for: 4.4.1. Substance C 4.4.2 Substance D 4.5 Write down the balanced equation for the formation of substance in D. QUESTION 5 5.1 Name the following compounds. 5.1.1 Ca(NOsz)z 5.1.2 MgBre 5.2 Write down the chemical formulae for each of the following substances. 5.2.1 Perchlorate ion 5.2.2. Ammonium Sulphate Copyright reserved Please turn over (2) (3) (1) (2) (2) (3) [13]

Downloaded from hlayiso.com Physical Sciences P2 September 2019 Common Test Grave 10 5.3 Balance the following equations: 5.3.1 Al(s) + O2(g) —» AlpOs3(s) (2) 9.3.2 CaHe (g) + O2 (g) + COz (g) + H20 (g) (2) [12] QUESTION 6 6.1 Define isotopes. (2) 6.2 Study the unknown elements A to E: A B Cc D E 19 19 20 21 19 xX X x Xx xX 9 10 9 rf 8 6.2.1 Write down the letter(s) that represent(s) isotopes. q) 6.2.2 Identify the element represented by this isotope. (2) 6.3 Complete the following table: Write down the question number in your answer book, next to it, your answer. Substance | Atomic | Atomic Number of | Number of | Number of number _| mass protons | neutrons | electrons Potassium |19 [6.3.1 [6.3.2 | 20 19 ‘Sulphide ion [16 32 16 633 | 6.3.4_ (4) 6.4 Consider the chlorine element. 6.4.1. Write down the valency of chlorine element. (1) 6.4.2 Draw an Aufbau diagram for chlorine element. (2) 6.4.3 Write down the name of the group where chlorine is found. (2) [14] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 September 2019 Common Test Grado 10 QUESTION 7 The graph below shows the atomic radii for the first 20 elements. 240 220 200 tan | 120 180 —f 160 | Sf 140 s i i 100 ] 80 60 “Sy 40: Atomic radius (pico meter) 20 oO 12 3 4 6§ 6 7 8 H He Li Be 8 C N O F Ne Na Mg Al Si P |«—_——— Period 2» «—_-— Period 3 Graph of atomic radius to atom number 7.1 Define atomic radius. 7.2 By referring to the atomic radii from lithium to neon. 7.2.1 State the general trend 7.2.2 Explain the trend 7.3 Whatis the relationship between atomic radius and electronegativity moving across the period? Copyright reserved @ 10 11 12 13 14 15 16 17 18 19 2 S cl Ar K Ca Please turn over (1) (2) [7]

Downloaded from hlayiso.com September 2019 Gommon Test Physical Sciences P2 QUESTION 8 @rade 10 8.1 Define electrical conductivity. 8.2 Concentrated NaOH was added dropwise into distilled water and conductivity was recorded. Drops of NaOH Ammeter reading (mA) 0 0,00 1 7,50 2 15,00 3 22,25 4 30,00 8.2.1 Why does the ammeter read zero when 0 drops were added? Write down the following for the above investigation 8.2.2 Investigative question. 8.2.3 Dependent variable. 8.2.4 Draw conclusion about the relationship between number of drops and electrical conductivity. 8.3. Which other physical property of solution would be dependent upon the number of drops? Copyright reserved Please turn over (2) (1) Q) (2) [9]

Downloaded from hlayiso.com Physical Sciences P2 ca September 2019 Common Test Grade 10 QUESTION 9 Each of the test tubes X and Y contains unknown precipitate of barium salts. One of the salts has carbonate ions and the other one has sulphate fons. Ba salt Ba salt ® (Y) The following observations were made during a practical investigation to identify solutions in the test tubes When nitric acid was added to each of the test tubes, the following observations were made. The precipitate in test tube X dissolved and effervescence was seen in the test tube. The precipitate in test tube Y did not dissolve. 9.1 Using the above information identify salt in test tube: 9.1.1 X (1) 9.1.2 ¥ (1) 9.2 Name the type of reaction that took place in test tubes X and Y before the addition — (1) of nitric acid. 9.3 Now, consider test tube X 9.3.1 Name the substance responsible for effervescence in test tube X. (1) 9.3.2 Write down a balanced equation for the reaction taking place after the (3) addition of nitric acid. [7] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 September 2019 Common Test Grade 10 QUESTION 10 10.1. Anxg of Zinc granules was allowed to react with 25 cm? of 0,12 moledm® hydrochloric acid solution as shown in the equation below: 2HCI (aq) + Zn (s) --» ZnCle (aq) + He (g) 10.1.1 Define concentration. (2) 10.1.2 Name the type of the above reaction. (1) 10.1.3 Calculate number of moles of hydrochloric acid. (3) 10.1.4 5 dm* of hydrogen gas was collected after the reaction was complete. Calculate the mass of zinc used in the reaction. (5) 10.2 Study the following reaction, and answer the questions that follow. 2502(g) + O2lg) -» 280s (g) 10.2.1 Define the Law of Conservation of mass. (2) 10.2.2 Is the above reaction a synthesis or decomposition reaction? (2) Give a reason, 10.2.3 By means of calculation, show that the above reaction as written obeys the law as stated in question 10.2.1 above. (3) [18] QUESTION 11 11.1 Define a Compound (2) 11.2 Calculate the percentage of chromium in KeCr2Qz. (3) 11.3 An inorganic substance was analysed and found to be containing 65,31% of oxygen, 32,65% of Sulphur and x amount of hydrogen. 11.3.1 Define an empirical formula. (1) 11.3.2 Calculate the percentage of hydrogen element in the substance. (2) 11.3.3 Determine the empirical formula for the compound. (4) 11.4 6,257 g of hydrated copper sulphate was heated, and during heating the mass was recorded. The mass of the content was decreasing and after a while the mass remained unchanged at 4 g. 11.4.1. Give a reason why the mass decreased. (2) 11.4.2 Calculate the number moles of water in the original hydrated salt. (4) [18] TOTAL MARKS: [150] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 13 Grade 10 FOR PHYSICAL SCIENCES PAPER 2 (CHEMISTRY) DATA SHEET TABLE 1: PHYSICAL CONSTANTS September 2019 Common Test NAME SYMBOL VALUE Avogadro's constant Na 6,02 x 107 mot" Charge on electron e -1,6x 10°C Electron mass Me 9,11 x 10°" kg Molar gas volume at STP Vin 22,4 dm?-mol' Standard temperature T 273 K Standard pressure po 1,013 x 10° Pa TABLE 2: FORMULAE —— C=-- Vv n-™ ne M or Vin m c= MV F(z Copyright reserved Please turn over

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Downloaded from hlayiso.com Physical Sciences P2 3 Common Test Sepiember 2019 Physical Sciences P2 4 Common Test September 2019 Grade 10- Marking Guideline Grade 10- Marking Guideline QUESTION 4 QUESTION 3 4.4 Nitrogen dioxide Vv {2) 3.4 Sublimation is the change during which a solid changes directly into a gas (2} without passing through an intermediate liquid phase.” ~ 4.2 Covalent bonds ”, oxygen atoms have the same electronegativi (3) share bonding electron Z 3.2 Margarine absorbs (heat) energy”, and forces of attraction within margarine will {2) weakerybreak. 4.3. Diamond ~ or graphite (1) 3.3 Cooling curve ¥ (1) 4.41 (2) 3.4.1 - Gaseous phase (1) vv 3.4.2 Liquid ¥ (2) Solid ¥ 3.5 Condensation ¥ (1) 3.6.1 - Closely packed ¥ (2) + Regular shaped ¥ . 4.4.2 (2) 3.6.2 - irregular shaped” (2) H - closely packed but able to flow vv 3.7 Boiling point and freezing point values are different to those of water vv (2) xe . HS . 3.8 Remains the same ¥ (2) N *H Energy absorbed is used to overcome forces of attraction ¥ Or No energy is available to increase kinetic energy Dod [17] 4.5 3H2+N2¥—2NHs ~ Bal: ~ (3) {13] QUESTION 5 §.1.1 Calcium nitrate ¥~ (2) 5.1.2. Magnesium bromide ¥“ (2) 5.21 Cle v¥ (2) 5.2.2 (NHs)2SOu ~ (2) 5.3.1 4Al+ 302 + 2AL0s YY (2) 5.3.2 Cale + 502 + 3CO2+ 4H20 VY (2) 12] Copyright Reserved Please Tum Over Copyright Reserved Please Tum Over

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Physical Sciences P2 a Common Test Sentember 2019 Grade 10- Marking Guideline 5 QUESTION 10 40.1.1 Concentration is the number of moles of solute per cubic decimeter of solution. ¥¥ (2) = 10.1.2 Gas forming reaction { Metal-Acid reaction” (1) {o) 10.1.3 (S) cas v v ° ° 012 = 5595 ” n domi? mol“ —_ n =3,00x107 mol > 8) qv] 10.1.4 — Vv n=— = Va 5 £ °" 2a % [o) n =0,2232mol | amotH, :tmolZn v y BOTH i m a n= So M, m ® 0,2232 = ne) on S m=14,519 / (6) —_ 40.2.4 Law of conservation of mass states that in an isolated system mass cannot be jon created or destroyed, but changes from one form to another. YY (2) s 10.2.2 Synthesis’, two reactants combined to form one products¥ (2) fo) 40.2.3 Mass of reactants = 2x32 +2x2x16 + 2x16 = 160 gemol? ¥ Qa Mass of products = 2x32 +3x2x16 = 160 g.mol" ¥ Mass of reactants = Mass of products, therefore law of mass is conserved y (3) 118} Piease Turn Over Copyright Reserved Physical Sciences P2 QUESTION 14 14.1 Compound is a group of two or m 8 Common Test September 2019 Grade 40- Marking Guideline ‘ore different atoms that attract each other by relatively strong forces or bonds. The atoms combine in definite proportions. . “¥ (2) 12 . MrCr, %Cr = 2 x 100% C= TCO, 104 Cr =r 100% ¥ Ci 24 v x 100% %Cr = 35,37% ¥ (3) 41.3.1 The simplest whole-number ratio of atoms in a compound. ¥ a) 41.3.2 %H = 100 - 65,31 — 32,65 = 2,04% VY (2) 11.3.3 H $ o Mass (g) 2,04 32,65 66,31 M (g/mol!) 4 32 16 Mole = m/M_| 2,04 4.02 4,08 vv Ratio 2 1 4 v Empirical formula = HeSOs”” (4) 41.4.1. Water changes into gas v and leaves the (system) ¥ (2) 11.4.2 CuSO4 H20 Mass (g) 4 2,257 v M (g/mol) 759,50 18 Mole =m/M_| 0,0251 0,125 vv Ratio 1 5 v (4) 113) TOTAL MARKS: [150] Copyright Reserved