9. Metals
A section of Chemistry, 0620
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This question is about iron and its compounds. The table shows how easy it is to reduce four metal oxides by heating with carbon. metal oxide ease of reduction with carbon chromium(oxide only reduced above 1700 °C iron(oxide only reduced above 650 °C magnesium oxide not reduced at 1750 °C nickel(oxide only reduced above 300 °C Use this information to put the metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  Iron is a transition element. Potassium is an element in Group I of the Periodic Table. Describe three ways in which the properties of iron differ from those of potassium.  Iron wire burns in oxygen. Balance the chemical equation for this reaction. Fe + O2 Fe3O4 Pure iron can be made by reducing iron(oxide, Fe2O3, with hydrogen. Fe2O3 + 3H2 2Fe + 3H2O How does this equation show that iron(oxide is reduced? When iron reacts with dilute hydrochloric acid, iron(chloride is formed. Describe a test for iron(ions. test result  Another chloride of iron has the structure shown. Fe Cl Cl Fe Cl Cl Cl Cl Deduce the molecular formula of this compound showing the number of iron and chlorine atoms. Some iron nails were placed in bottles under different conditions. D C B A moist air boiled water water iron nails anhydrous calcium chloride to dry the air In which bottles will the iron nails not rust? Give reasons for your answer. 
0620_s18_qp_31
THEORY
2018
Paper 3, Variant 1
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This question is about GroupI elements and their compounds. The properties of some GroupI elements are shown in the table. element boiling point / °C atomic radius / pm relative thermal conductivity observations when it reacts with cold water sodium 3.9 rapid bubbling but does not burst into flame potassium very rapid bubbling and bursts into flame rubidium 1.6 caesium 1.0 explodes Complete the table to estimate: ● ● the relative thermal conductivity of potassium ● ● the atomic radius of rubidium.  Describe the trend in the boiling points of the GroupI elements. Use the information in the table to predict what you would observe when rubidium reacts with cold water. Which one of the statements about the formation of a sodium ion from a sodium atom is correct? Tick one box. A sodium atom gains an electron. A sodium atom loses an electron. A sodium atom loses a proton. A sodium atom gains a proton.  Is sodium oxide an acidic oxide or a basic oxide? Give a reason for your answer. A compound of sodium has the formula C4H5Na. Calculate the relative formula mass of C4H5Na. Show all your working. Use your Periodic Table to help you.  relative formula mass = Complete the word equation for the reaction of sodium hydroxide with sulfuric acid. sodium hydroxide + sulfuric acid +  
0620_s18_qp_31
THEORY
2018
Paper 3, Variant 1
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This question is about manganese and its compounds. Potassiummanganate(is soluble in water. A purple crystal of potassiummanganate(was placed in the middle of a piece of damp filter paper. After 1hour, the purple colour had spread over most of the filter paper. crystal of potassium manganate(at the start after 1 hour Explain these observations using the kinetic particle model. Potassiummanganate(is produced from manganese(oxide by an oxidation reaction. What is meant by the term oxidation? Potassium manganate(decomposes when heated. The products are oxygen and manganese(oxide. Describe a test for oxygen. test result  Manganese(oxide reacts with concentrated hydrochloricacid. Balance the chemical equation for this reaction. MnO2 + HCl MnCl 2 + Cl 2 + H2O  The table compares the reactivity of four metals with hydrochloric acid of the same concentration. metal reactivity with hydrochloric acid lead No bubbles seen. Metal does not disappear. magnesium Rapid formation of bubbles. Metal disappears rapidly. manganese Steady formation of bubbles. Metal disappears slowly. tin Bubbles formed slowly. Metal disappears very slowly. Use this information to put the metals in order of their reactivity. Put the least reactive metal first. least reactive most reactive  Manganese is a transition element. Sodium is an element in Group I of the Periodic Table. Describe three ways in which the properties of manganese differ from those of sodium.  
0620_s18_qp_32
THEORY
2018
Paper 3, Variant 2
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