Physical Sciences Grade 10 P2 2018 QP & Memo

———Dawnloaded fromhlaviso.com education Department: Education PROVINCE OF KWAZULU-NATAL . PHYSICAL SCIENCE: CHEMISTRY (P2) ‘ * COMMON TEST : : JUNE 2018 5 NATIONAL SENIOR CERTIFICATE GRADE 10 MARKS: 100 TIME: 2 hours This question paper consists of 11 pages and a Periodic Table. Copyright reserved Please turn over = score aaa

Physical Sciences P2 Downloaded from hlayiso,com, ...... res Grade 10 INSTRUCTIONS AND INFORMATION 10. This question paper consists of EIGHT 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 to 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 June 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 letter (A — D) next to the question number (1.1 — 1.7) in the answer book, for example 1.8 D. 14 Which term describes ability of metals to stretch into thin wires? A Brittle B Ductile Cc Malleable D Tensile strength (2) 1.2 Silicon can be classified as a... A Metal B Metalloid Cc Non metal D transition metal (2) 1.3. Solid carbon dioxide turns directly into a gas at room temperature. This process is called... A Boiling B Deposition Cc Sublimation D Evaporation (2) 1.4. The type of bond where both the bonding electrons come from the same atom is described as a/an ... A lonic Bond B Dative bond Cc Covalent bond D Metallic bond (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 June 2018 Common Test Grade 10 1.5 Which one of the following reactions can be classified as REDOX reaction? Zn(s) + 2HC£ (aq) + ZnCte(aq) + He(g) KC? (aq) + AgNOs (aq) —* KNOs (aq) + AgCE (s) Cu?* (aq) + O?(aq) + CuO (s) ZnC& (aq) + CaSOa (aq) > ZnSOa (aq) + CaCfe(aq) (2) 0 O WP, 1.6 The energy released when an electron is added to an atom or molecule is called ... A Electronegativity B Electron affinity Cc Enthalpy change D lonisation energy (2) 17. The separation technique most suitable for the separation of an oil-water mixture in the laboratory is... A Decanting B Chromatography Cc Magnetic attraction D Fractional Distillation (2) [14] Copyright reserved Please turn over

Downloaded from hlayiso,Com, conmon-res Grade 10 Physical Sciences P2 QUESTION 2 2.1 The following graph, not drawn to scale, represents the cooling curve of a substance with a boiling point of 95°C. 150 2 2 5 to t ie ts Time (min) 2.1.1 Define temperature. (2) 2.1.2 Name the phase of the substance between times to and ti. (1) 2.1.3 Write down the freezing point of this substance. (1) 2.1.4 Name the process taking place between times ti and tz. (1) 2.1.5 Use Kinetic Molecular theory to explain the process mentioned in (2) question 2.1.4. 2.1.6 In what state of matter is the substance after time ts? (1) 2.2 Consider the following statements, and answer questions that follow: i. Boiling is the same as evaporation due to associated phase change. li Evaporation and boiling have the same phase change, but boiling occurs at specific temperature. 2.2.1 Define boiling point. (2) 2.2.2 Which statement is correct? Explain. (3) [13] Copyright reserved Please turn over

Physical Sciences P2 Downloaded from hlayiso,corm Common Test Grade 10 QUESTION 3 Bid. 3.2 3.3 3.4 Study the following processes and answer the questions that follow: Heat A: H20js) ie Hew) B: C+0%) 9 ————> CO2g) Heat 3.1.1 Identify the process that represents a chemical change. 3.1.2 Identify the process that represents a physical change. 3.1.3. Are the above processes endothermic or exothermic? Provide a reason for the answer. Name the following compounds 3.2.1 HBr 3.2.2 CCh 3.2.3 NaeS203 Balance the following reactions: 3.3.1 Fe +O2-> FeeOs 3.3.2 C2He + O2-— CO2z + H20 3.3.3 NaeSOz + Ba(NOs)2 — BaSOs + NaNOs Consider the following chemical reaction: 2HNOs (aq) + Ca(OH)2 (aq) - Ca(NOs)e(aq) + 2H2O(I) 3.4.1 State the law of conservation of mass. 3.4.2 Show that the reaction obeys the law of conservation of mass. Copyright reserved Please turn over (2) (3) [20]

Downloaded from hlayiso.com Physical Sciences P2 June 2018 Common Test Grade 10 QUESTION 4 4.1. Magnesium is an element, with an atomic number of 12 and naturally exists as isotopes. 4.1.1 What are isotopes? (1) Magnesium consist of 3 naturally occurring isotopes, “Mg, ?5Mg and 26Mg | Isotope — % abundance | Atomic Mass number i 2g 78.99 23,985 = 25g 24.959 | LC 2eMig 41.01 25,983 4.1.2 Name the group in which magnesium is found. (1) 4.1.3 Name the element that has the same number of electrons as there are core electrons in magnesium. (1) 4.1.4 Calculate the number of neutrons in 26g. (1) 4.1.5 Calculate the percentage abundance of 25Mqg. () 4.1.6 Determine the relative atomic mass of Magnesium. (4) 4.2 Oxygen exists naturally as a diatomic molecule: 4.2.1 What is a diatomic molecule? (2) 4.2.2 Give the valency of oxygen in its natural state. (1) 4.2.3 State Pauli’s Exclusion Principle. (2) 4.2.4 Write down the electronic configuration for the oxygen atom. (2) 4.2.5 Name the type of bonding that takes place in the oxygen molecule. (1) [17] Copyright reserved Please turn over

Physical Sciences P2 QUESTION 5 Grade 10 5.1. Define an ionic bond. Downloaded from hlayiso.com June 2018 Common Test 5.2 Draw the Lewis structures for the following substances. 5.2.1 COz (2) 5.2.2 NHs (2) [6] QUESTION 6 Grade 10 learners carry out two chemical reactions in aqueous solutions. Test tube A has a solution of sodium carbonate and test tube B has a solution of sodium sulphate. Into each test tube a small amount of barium chloride solution is added. A a Barium chloride —™, B Sodium Carbonate Sodium Sulphate The results are shown in the table below. Test tubes Reagents Observations | A. BaCk: (aq) and NaeCOs(aq) | White solid forms B. BaCtle (aq) and NazSO4(aq) | White solid forms | 6.1. What is meant by an aqueous solution? (1) 6.2 Name the type of reaction taking place in both test tubes (1) 6.3 Write down the chemical formula of the salt produced in test tube A. (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences P2 June 2018 Common Test Grade 10 6.4 Nitric acid, HNOs, is now added to both test tubes. State the observable changes that take place in: 6.4.1 test tube A (1) 6.4.2 test tube B (1) 6.5 Write down the balanced equation for the reaction that explains the observation in question 6.4. (3) [9] QUESTION 7 Two solutions are provided as shown below: A B Sugar Solution Sodium Chloride Solution 7.1. Define a solution. (2) 7.2 Write down the chemical formula for sodium chloride. (1) 7.3 Give a common name for sodium chloride. (1) Copyright reserved Please turn over

Physical Sciences P2 Grade 10 7.4 The following experimental set up is used to determine the electrical conductivity of the above solutions ny | 7.4.1. What physical quantity is measured by component X? 7.4.2 Define an electrolyte. Downloaded from hlayiso,co une 2018 Common Test Electrode Solution Aor B 7.4.3 \dentify the solution (A or B) that will give a reading on X? Give a reason 7.4.4 How would an INCREASE in CONCENTRATION of the solution identified in question 7.4.3 affect the reading on X? (Choose from: INCREASES; DECREASES or REMAINS THE SAME) Explain? Copyright reserved Please turn over (3) [12]

Downloaded from hlayiso.com Physical Sciences P2 June 2018 Common Test Grade 10 QUESTION 8 8.1 The graph below shows the first ionization energies of group 2 elements. TT ae | kJimor! 79° | | aa 500 7 | 300 ee me ee SY fa Group 2 elements 8.1.1 Define first ionization energy. (2) 8.1.2 Describe the trend in the first ionization energies, of group 2 elements. (2) 8.2. The first ionization energy of Na (Sodium) is 496 kJ.mol, whilst the first ionization energy of Mg (magnesium) is 738 kJ.mol!. Explain this difference. (3) 8.3 For each of the following questions, choose from: INCREASES, DECREASES, REMAINS THE SAME 8.3.1 How does the atomic radius change on going across a period? (1) 8.3.2 How does the electronegativity change on going down a group? (1) [9] TOTAL MARKS: — [100] Copyright reserved Please turn over

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Downloaded from hlayiso.com Physical Sciences P2 3 Grade 10- Memorandum QUESTION 3 3.1.1 BY 3.12 Av 3.1.3. Endothermic”’, in both processes heat energy was added.” 3.2.1 Hydrogen bromide ¥ 3.2.2 Carbon tetrachloridey ¥ 3.2.3 Sodium thiosaphate v¥ 3.3.1 4Fe + 302 ¥— 2Fe203 ¥ 3.3.2 2C2He + 702 ¥—» 4COz + 6H20Y 3.3.3 NazSO4 + Ba(NOs)z “— BaSOz + 2NaNO3 ¥ 3.4.1 Matter cannot be created or destroyed but is transformed from one form to another’ v 3.4.2 Mreactent =2x1+2x14+2x3x16 + 40 + 2x16 +2x1 Y= 160 g.mol! Moproducts =40 +2x14 +2x2x16 +2x2x1 +2x16 ¥= 160 g.molt ¥ QUESTION 4 4.1.1 Atoms of the same element (having the same number of protons), with different number of neutrons. ¥ 41.2 Alkali Earth metals¥ 4.1.3. Neon Nev 4.1.4 N=26-12= 14 neutronsY 4.1.5 %lg = 100 - (78.99 +11.01) = 10% ¥ Copyright Reserved nmon Test June 2018 Please Turn Over Physical Sciences P2 4 Grade 10- Memorandum Common Test June 2018 416 RAN. = M*Mg x % abundance = MPMg x % abundance + MMg x % abundancev (4) — 100% 100% 100% (1) = 23,985 x78,99 + 24,959 x 10% 4 25,983 x11,01% Vw (1) 100% 100% 100% (2) = 24.302 g.moltv (4) 4.2.1 Molecule that consist of 2 atoms from the same element. ¥ ¥ (2) (2) 422 27 (1) 4.2.3 The maximum of 2 electrons in an orbital provided that they spin in opposite (2) directions. v (2) (2) (2) 4.2.4 1s'2s2%pt vv (2) (2) 4.2.5 Covalent bondY (1) 117) (2) QUESTION 5 (3) 5.1 Anionic bond is a chemical bond whereby electron(s) is transferred fromone (2) [20] atom to the otherv v 5.2.1 id (2) Copyright Reserved Please Turn Over

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