9.5. Corrosion of metals
A subsection of Chemistry, 0620, through 9. Metals
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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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