30) Substance A to E below are listed with several of their properties. The identities of the substances are identified in random order below: Iron, ethane, ethanol, sodium nitrate, graphite compound, metallic solid, or network solid. Write your predictions in the sixth coloumn of the chart, First classify each substance as either a polar covalent compound, non-polar covalent compound, ionic under "type of substance." Then, identify the identity of the substance in the last coloumn. [10 MARKS] Substance A B C D E Melting Point (C) -182 1538 308 -114 Boiling Solubility in Point HO (C) -88 2862 380 3456 78 Insoluble Energy Insoluble Soluble Insoluble Soluble Reactants Electrical Type of Conductivity Substance as: Solid, Liquids, Solution B No/No/- Yes/Yes/- Yes/Yes/Yes 31) The reaction profile for a given chemical reaction is shown below [5 MARKS]: No/-/- No/No/No Products D Progress of reaction a. Which arrow represents the activation energy for the forward reaction? b. Which arrow represents the activation energy for the backward reaction? c. Is the forward reaction exothermic or endothermic? d. Is the reverse reaction exothermic or endothermic? Identity of Substance e. On the reaction profile, label the area on the diagram where the activated complex can be found.