TLEHscChem - The Leading Edge – HSC Chemistry CONTENTS...

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Unformatted text preview: The Leading Edge – HSC Chemistry CONTENTS Identification and production of materials Multiple choice questions Short answer questions The acidic environment Multiple choice questions Short answer questions Chemical monitoring and management Multiple choice questions Short answer questions Options 1 Industrial chemistry Multiple choice questions Short answer questions 2 Shipwrecks, corrosion and conservation Multiple choice questions Short answer questions 3 Forensic chemistry Multiple choice questions Short answer questions Suggested answers Identification and production of materials The acidic environment Chemical monitoring and management Option 1 Industrial chemistry Option 2 Shipwrecks, corrosion and conservation Option 3 Forensic chemistry Sample Examination Paper 1 Suggested answers Sample Examination Paper 2 Suggested answers Data sheets Periodic table Tear-out answer sheets 8 14 17 22 23 28 33 37 38 40 41 44 45 49 51 55 57 58 61 80 91 123 133 134 135 3 The Leading Edge – HSC Chemistry Chemical Monitoring and Management Short Answer Questions 1. For the reaction CO(g) + H2(g) predict the effect on the position of equilibrium of (a) increasing the pressure (b) adding H2 (c) decreasing the temperature. HCHO(g) + heat, 2. (a) Write a balanced equation showing the chemical reaction that leads to the formation of airborne acid rain droplets due to the presence of nitrogen dioxide in the air. (b) What is the main source of nitrogen oxide pollutants in the air? (c) Name two direct effects of acid rain pollution on human health. 3. The oxides of the elements in the third period of the periodic table show a trend in acidbase properties going across the period. Choose specific examples of three oxides, one basic, one amphoteric and one acidic, then use examples to illustrate the trend, writing balanced equations for any chemical reactions involved. 4. When 2.5 g zinc is dissolved in excess sulfuric acid, what volume of hydrogen (measured at 273K and 101.3kPa pressure) is formed? 5. Blood normally has a pH of 7.4 (a) Calculate the [H+] of blood (b) Describe, with equations, the process of acidosis in the blood. 6. When iron pyrites (FeS2), an ore of iron, is roasted in oxygen, the following reaction occurs 4FeS2(s) + 11O2(g ) → 8SO2(g) + 2Fe2O3(s) (a) What is the name for both products of the reaction? (b) What is the theoretical volume of SO2(g) at 25°C and 101.3 kPa that could be produced from 1.00 kg of pure pyrites? (c) Assuming air to be 20% oxygen by volume, what is the minimum volume of air measured at 25°C and 101.3 kPa required for the reaction in (b)? 28 The Leading Edge – HSC Chemistry Option 3 Forensic chemistry Multiple choice questions 1. Carbohydrates (A) contain the elements C, H and N (B) are all monosaccharides (C) are also called sugars (D) all of the above 2. An example of a disaccharide is (A) glucose (B) galactose (C) cellulose (D) maltose 3. A condensation reaction (A) occurs when α-glucose and β-fructose are linked to form sucrose (B) occurs when α-glucose and β-fructose are linked to form maltose (C) occurs when α-glucose and β-fructose are linked to form lactose (D) occurs when any disaccharide is hydrolysed 4. Cellulose (A) is a highly branched molecule (B) is made of β-glucose units (C) is readily soluble in water (D) can be hydrolysed by enzymes found in the human body 5. Most monosaccharides (A) are reducing sugars (B) do not react with Tollens’ reagent or Benedict’s solution (C) do not contain the -CHO group in the open form (D) none of the above 6. Fats and oils (A) have a cholesterol-like structure (B) are soluble in polar organic solvents (C) are esters of glycerol (D) contain no functional groups 7. Unsaturated fatty acids can be distinguished from saturated fatty acids by (A) the number of double covalent bonds in the molecules (B) reaction with bromine solution (C) reaction with permanganate solution (D) all of the above 41 The Leading Edge – HSC Chemistry General Test Instructions PAPER 1 HIGHER SCHOOL CERTIFICATE • • • • Reading time – 5 minutes Working time – Three (3) hours Board approved calculators may be used A data sheet and periodic table are provided with this paper on pages 133 and 134. SAMPLE EXAMINATION PAPER Section I – Core • Attempt ALL questions. Part A • 15 multiple-choice questions, each worth 1 mark. • Mark your answers in pencil on the tear-out Answer Sheet provided on page 135. Part B • Other questions with a total mark value of 60. • Answer this part in the spaces provided in Part B of the Answer Book. CHEMISTRY Section II – Options • • Attempt ONE question only. Each question is worth 25 marks. 61 The Leading Edge – HSC Chemistry Section II – Options 25 marks Attempt ONE question from questions 27 – 31. Allow about 45 minutes for this section. Answer the questions in a writing booklet. Extra writing booklets are available. Show all relevant working in questions involving calculations. Page Question 27 Question 28 Question 29 Question 30 Question 31 INDUSTRIAL CHEMISTRY SHIPWRECKS, CORROSION and CONSERVATION THE BIOCHEMISTRY OF MOVEMENT THE CHEMISTRY OF ART FORENSIC CHEMISTRY 79 81 82 83 84 Question 27 – INDUSTRIAL CHEMISTRY (25 marks) a. The contact process is used to manufacture sulfuric acid i. ii. iii. iv. Outline the three main stages in the manufacture of sulfuric acid. 3 Sulfur is burnt in dry air to produce sulfur dioxide. Explain why the air must be dry for this step. 1 A catalyst is used in the process. Why is a catalyst used rather than a simply raising the temperature. 2 The process typically produces sulfuric acid of 98.5% w/w concentration. Given that the density of this acid is 1.8 g cm-3, calculate the molarity of the acid. 3 Discuss the conditions used for the contact process. Include the significance of temperature, pressure and catalyst. 3 Why is sulfuric acid regarded as the most important industrial acid. 2 v. vi. b. Chlorine and sodium hydroxide are produced by the electrolysis of saturated sodium chloride. Briefly outline the two different commercial methods that are used and write the anode and cathode reactions for each method. 6 i. ii. iii. Define the term saponification. What is the chemical process involved in saponification. Briefly describe the experimental method. 1 2 2 c. 75 ...
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This note was uploaded on 09/27/2010 for the course 456 9852 taught by Professor Chaohue during the Spring '10 term at Mackenzie.

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