0620_m19_qp_42
A paper of Chemistry, 0620
Questions:
6
Year:
2019
Paper:
4
Variant:
2
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1
Period3 of the Periodic Table is shown. sodium magnesium aluminium silicon phosphorus sulfur chlorine argon Answer the following questions using only these elements. Each element may be used once, more than once or not at all. State which element: is a gas at room temperature and pressure forms a basic oxide with a formula of the form X2O is made of atoms which have a full outer shell of electrons forms an oxide which causes acid rain is extracted from bauxite forms an oxide which has a macromolecular structure consists of diatomic molecules. 
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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Fluorine is a GroupVII element. Fluorine forms compounds with metals and non-metals. Predict the physical state of fluorine at room temperature and pressure. Fluorine exists as diatomic molecules. Complete the dot-and-cross diagram to show the electron arrangement in a molecule of fluorine. Show outer shell electrons only. F F  Write a chemical equation for the reaction between sodium and fluorine. Explain why chlorine does not react with aqueous sodium fluoride. Tetrafluoromethane and lead(fluoride are fluorides of GroupIV elements. Some properties of tetrafluoromethane and lead(fluoride are shown in the table. property tetrafluoromethane lead(fluoride formula CF4 melting point / °C –184 boiling point / °C –127 conduction of electricity when solid non-conductor non-conductor conduction of electricity when molten non-conductor good conductor What is the formula of lead(fluoride? What type of bonding is present between the atoms in tetrafluoromethane? What type of structure does solid lead(fluoride have? Explain, in terms of attractive forces between particles, why lead(fluoride has a much higher melting point than tetrafluoromethane. In your answer refer to the types of attractive forces between particles and their relative strengths. Tetrafluoroethene is an unsaturated compound with the formula C2F4. Tetrafluoroethene is the monomer used to make the polymer poly. What is meant by the term unsaturated ? Describe a test to show that tetrafluoroethene is unsaturated. test observations  Draw the structure of a molecule of tetrafluoroethene. Show all of the atoms and all of the bonds.  Tetrafluoroethene can be polymerised to form poly. Draw one repeat unit of poly. Show all of the atoms and all of the bonds.  Deduce the empirical formula of: tetrafluoroethene poly.  
2. Atoms, elements and compounds  →  2.5. Simple molecules and covalent bonds
11. Organic chemistry  →  11.1. Formulae, functional groups and terminology
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This question is about ethanoic acid, CH3COOH. Ethanoic acid is manufactured from methanol and carbon monoxide. CH3OH+ COCH3COOHThe process is done at 200 °C and 30 atmospheres pressure. The forward reaction is exothermic. Complete the table using only the words increases, decreases or no change. effect on the rate of the forward reaction effect on the equilibrium yield of CH3COOHadding a catalyst no change increasing the temperature decreasing the pressure decreases  How would you show that an aqueous solution of ethanoic acid is an acid without using an indicator or measuring the pH? State the reagent you would use and give the expected observations. Write a chemical equation for the reaction that you describe. ● ● reagent ● ● expected observations ● ● chemical equation  Ethanoic acid is a weak acid. What is meant by the term acid ? Why is ethanoic acid described as weak ? Ethanoic acid reacts with methanol to form an ester. State two conditions required for this reaction.  Draw the structure of the ester formed when ethanoic acid reacts with methanol. Show all of the atoms and all of the bonds. Name the ester. structure name  Name an ester which is a structural isomer of the ester in . 
11. Organic chemistry  →  11.7. Carboxylic acids
7. Acids, bases and salts  →  7.1. The characteristic properties of acids and bases
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Titanium is extracted from an ore called rutile. Rutile is an impure form of titanium(oxide, TiO2. Rutile is mixed with coke and heated in a furnace through which chlorine gas is passed. The product is gaseous titanium(chloride, TiCl 4. TiO2+ 2C+ 2Cl 2TiCl 4+ 2COThe gaseous titanium(chloride produced is condensed into the liquid state. The titanium(chloride is then separated from liquid impurities. Suggest the name of the process by which liquid titanium(chloride could be separated from the liquid impurities. Carbon monoxide, CO, is also produced in the reaction. Why should carbon monoxide not be released into the atmosphere? Calculate the volume of chlorine gas, Cl 2, at room temperature and pressure, that reacts completely with 400 g of TiO2using the following steps. TiO2+ 2Cl 2+ 2CTiCl 4+ 2CO● ● Calculate the relative formula mass, Mr, of TiO2.  Mr of TiO2 = ● ● Calculate the number of moles in 400 g of TiO2.  mol ● ● Determine the number of moles of Cl 2 that react with 400 g of TiO2.  moles of Cl 2 = mol ● ● Calculate the volume of Cl 2 that reacts with 400 g of TiO2.  volume of Cl 2 = dm3  Titanium(chloride, TiCl 4, is heated with an excess of magnesium, in an atmosphere of argon. Balance the chemical equation for the reaction. TiCl 4 + Mg Ti + MgCl 2  Titanium(chloride can be reacted with sodium instead of magnesium. The reaction between titanium(chloride and sodium is similar to the reaction between titanium(chloride and magnesium. Write a chemical equation for the reaction between titanium(chloride and sodium. Suggest why the reaction between titanium(chloride and magnesium is done in an atmosphere of argon and not in air. After titanium(chloride is heated with magnesium, the unreacted magnesium is removed by adding an excess of dilute hydrochloric acid to the mixture. The dilute hydrochloricacid also dissolves the magnesiumchloride. The dilute hydrochloricacid does not react with the titanium or dissolve it. Give two observations and write a chemical equation for the reaction that occurs when dilute hydrochloric acid reacts with magnesium. chemical equation  Name the process that is used to separate the titanium from the mixture after all the magnesium has been removed. Titanium does not react with the dilute hydrochloric acid or dissolve in it. Suggest why titanium does not react with dilute hydrochloric acid. Magnesium cannot be produced by electrolysis of aqueous magnesium chloride using inert electrodes. Name the product formed at the negative electrode during the electrolysis of aqueous magnesium chloride. Suggest how magnesium can be produced from magnesium chloride by electrolysis. 
9. Metals  →  9.4. Reactivity series
12. Experimental techniques and chemical analysis  →  12.5. Identification of ions and gases
4. Electrochemistry  →  4.1. Electrolysis
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This question is about transition elements. Transition elements are harder and stronger than GroupI elements. Describe two other differences in physical properties between transition elements and GroupI elements.  State one physical property of transition elements that is similar to GroupI elements. State two chemical properties of transition elements.  Cobalt is a transition element. Anhydrous cobalt(chloride is used to test for water. State the colour change that occurs when water is added to anhydrous cobalt(chloride. from to  Iron is a transition element. Which two substances react with iron to form rust?  Which metal is used to galvanise iron? The hull of a ship is made from steel (mainly iron). Metal blocks are placed on the ship’s hull to prevent rusting. water water metal block ship’s hull Use your knowledge of the reactivity series to explain why: ● ● magnesium is suitable to use as the metal blocks ● ● copper is not suitable to use as the metal blocks. Rust contains iron(oxide. Phosphoric acid, H3PO4, can be used to remove rust from an iron object and prevent further rusting. Write a chemical equation for the reaction between iron(oxide and phosphoric acid to form iron(phosphate and water. Iron(phosphate is an insoluble salt. Suggest how the formation of iron(phosphate prevents further rusting. 
8. The Periodic Table  →  8.4. Transition elements
9. Metals  →  9.5. Corrosion of metals
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