0620_w17_qp_33
A paper of Chemistry, 0620
Questions:
6
Year:
2017
Paper:
3
Variant:
3
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1
The diagram shows the structures of five substances, A, B, C, D and E. A B D E C N N O S O O C O Cl – Cl – NH4 + NH4 + Cl – Cl – NH4 + NH4 + Cl – Cl – NH4 + NH4 + H H H N Answer the following questions using only the structures in the diagram. Each structure may be used once, more than once or not at all. Which structure, A, B, C, D or E, is a compound which is used as a fertiliser, is a diatomic molecule, contains chloride ions, is a gas which turns damp red litmus paper blue, is an element? Structure A is sulfur dioxide. Sulfur dioxide is an atmospheric pollutant. State one source of sulfur dioxide. Give one adverse effect of sulfur dioxide on health. An isotope of nitrogen is represented by the symbol 15N 7 . Deduce the number of protons, neutrons and electrons in this isotope of nitrogen. number of protons number of neutrons number of electrons
12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases
2. Atoms, elements and compounds  →  2.2. Atomic structure and the Periodic Table
8. The Periodic Table  →  8.1. Arrangement of elements
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2
The atmosphere of the planet Venus contains 96.4% carbon dioxide, 3.5% nitrogen and small amounts of other gases. Describe how Venus’ atmosphere differs from the Earth’s atmosphere. Give three differences. Describe a test for carbon dioxide. test result Venus’ atmosphere also contains small amounts of water and argon. Water is a covalent compound. Complete the diagram to show ● the arrangement of electrons in a molecule of water, ● the symbols of the atoms present. Show outer shell electrons only. The melting point of argon is –189 °C. The boiling point of argon is –186 °C. What is the physical state of argon at –200 °C? Explain your answer. Argon is unreactive. Explain why argon is unreactive in terms of its electronic structure. Clouds of sulfuric acid are present in Venus’ atmosphere. Sulfuric acid reacts with magnesium carbonate. H2SO4 + MgCO3 MgSO4 + CO2 + H2O Write the word equation for this reaction. Calculate the relative molecular mass of sulfuric acid, H2SO4. Use your Periodic Table to help you. relative molecular mass = Sulfur dioxide is found in the atmospheres of both Venus and the Earth. State one use of sulfur dioxide. Sulfur dioxide dissolves in water to form an acidic solution. Which one of the following pH values is acidic? Put a circle around the correct answer. pH 2 pH 7 pH 9 pH 14
12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases
6. Chemical reactions  →  6.3. Reversible reactions and equilibrium
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3
The list shows some of the compounds used to manufacture ink. calcium carbonate ethanoic acid iron(sulfate potassium dichromate(sodium sulfate sulfuric acid Which compound is present in limestone? Hydrated iron(sulfate is heated gently. FeSO4.7H2O FeSO4 + 7H2O Describe what you would see when a test-tube containing a small amount of hydratediron(sulfate is heated gently. Describe a test for aqueous iron(ions. test result Iron(sulfate can be prepared by reacting an excess of iron with dilute sulfuric acid. Complete the chemical equation for this reaction. Fe + H2SO4 FeSO4 + Describe how you could remove the excess iron from the mixture formed. Complete the structure of ethanoic acid to show all of the atoms and all of the bonds. C C O Give one observation when aqueous ethanoicacid reacts with magnesium. Black ink contains a mixture of different coloured dyes. Draw a labelled diagram of the apparatus used to separate these different coloured dyes by chromatography. Blue ink was placed at the bottom of a beaker containing water. After 2 days, a blue colour had spread throughout the beaker. at the start after 6 hours after 2 days water ink Explain these observations using the kinetic particle model.
12. Experimental techniques and chemical analysis  →  12.3. Chromatography
9. Metals  →  9.4. Reactivity series
12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases
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4
The table shows the properties of four substances. substance boiling point electrical conductivity of solid electrical conductivity when molten density in g / cm3 aluminium high conducts conducts 2.70 diamond 3.51 potassium bromide high does not conduct conducts 2.75 sulfur low does not conduct 2.07 Complete the table to show the electrical conductivity of solid diamond and molten sulfur. Give one piece of evidence from the table that shows that sulfur is a simple covalent substance. What information in the table shows that potassium bromide is an ionic compound? State one property of aluminium given in the table which makes it suitable for making aircraft. Aluminium oxide is obtained from the ore bauxite. What method is used to extract aluminium from aluminium oxide? Molten potassium bromide can be electrolysed. Predict the products of this electrolysis at the positive electrode , the negative electrode . Which two statements describe the structure and bonding in diamond? Tick two boxes. Diamond has ionic bonds. Diamond has a giant structure. Diamond is a simple molecule. Diamond has covalent bonds. Give one use of diamond.
2. Atoms, elements and compounds  →  2.4. Ions and ionic bonds
9. Metals  →  9.2. Uses of metals
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5
Lead is extracted from an ore which contains lead(sulfide. The ore is first heated in air. Balance the chemical equation for this reaction. 2PbS + O2 2PbO + SO2 The lead(oxide produced is then reduced with carbon. PbO + C Pb + CO How does this equation show that the lead(oxide is reduced? Lead is a metal in Group IV. Iron is a transition element. Give two physical properties that are typical of transition elements. State the conditions needed for iron to rust. Iron from the blast furnace is converted into steel using oxygen and basic oxides. What is the purpose of the oxygen? Which one of these oxides is a basic oxide? Put a circle around the correct answer. carbon dioxide nitrogen dioxide potassium oxide sulfur trioxide Explain your answer. Steel is an alloy. What is meant by the term alloy? Give one common use of mild steel. Give one common use of stainless steel.
9. Metals  →  9.5. Corrosion of metals
9. Metals  →  9.6. Extraction of metals
4. Electrochemistry  →  4.1. Electrolysis
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6
The diagram shows a fractionating column used for the fractional distillation of petroleum. kerosene fraction F gasoline fraction refinery gas On the diagram, write ● the letter X to show where the temperature in the fractionating column is highest, ● the letter B to show where bitumen is removed from the fractionating column. Give the name of the fraction labelled F in the diagram. Refinery gas contains methane, ethane and propane. Draw the structure of a molecule of ethane showing all of the atoms and all of the bonds. Methane can be converted to hydrogen by reaction with steam. Balance the chemical equation for this reaction. CH4 + H2O CO + H2 This reaction is endothermic. What is meant by the term endothermic? Some petroleum fractions are cracked to form different hydrocarbons. Describe the process of cracking. In your answer ● explain what is meant by the term cracking, ● state the conditions needed to crack hydrocarbons. The table shows some properties of four alkanes. alkane number of carbon atoms in one molecule boiling point / °C methane –164 ethane –88 propane butane How does the boiling point change as the number of carbon atoms in one molecule increases? Predict the boiling point of propane. Describe the arrangement and separation of the molecules in liquid butane. arrangement separation
11. Organic chemistry  →  11.3. Fuels
11. Organic chemistry  →  11.5. Alkenes
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