Chlorine, Cl2, reacts with many elements and compounds to form chlorides. Table 2.1 shows information about some chlorides of Period 3 elements. Table 2.1 Na Mg Si formula of chloride structure of chloride giant bonding of chloride pH of solution formed on addition of chloride to water 6.2 covalent

1. (a)Complete Table 2.1.[3]
2. (b)(i)When Cl₂ reacts with cold NaOH(aq), Cl₂ is both oxidised and reduced. The products are NaCl, water and G. State the type of redox reaction in which the same species is both oxidised and reduced.[1]
3. (b)(ii)Identify G.[1]
4. (b)(iii)Write an equation for the reaction between Cl₂ and hot NaOH(aq).[1]
5. (b)(iv)Describe fully what is observed when AgNO3(aq) is added to the aqueous solution of the chloride of sodium, followed by dilute NH3(aq).[2]
6. (c)(i)An excess of Cl2 reacts with phosphorus to form PCl5. PCl5 is a simple molecule in the gas phase. It also exists in a solid form as two ions, PCl4+ and PCl6¯. Complete Table 2.2 to identify the shapes of each of these species. Table 2.2 species PCl5 shape PCl4+ tetrahedral PCl6¯[2]
7. (c)(ii)PCl6¯ reacts with J to form H3PO4. Identify J and state the type of reaction. J type of reaction[2]
8. (d)(i)Cl2 reacts readily with propene to form K, 1,2-dichloropropane. K can be used to form L. propene Cl2 reaction 1 K Cl Cl reaction 2 L Cl [Figure 2.1] Complete Fig. 2.2 to show the mechanism for the reaction of Cl₂ with propene in reaction 1. Include charges, dipoles, lone pairs of electrons and curly arrows, as appropriate. H H C H CH3 Cl Cl [Figure 2.2] HH H-C-C-CH3 CI CI[4]
9. (d)(ii)Identify the reagent and conditions for reaction 2.[1]
10. (d)(iii)Draw one repeat unit of the addition polymer that forms from L.[1]

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