Lesson 1 Group 7 Elements Eam

Group 7 Chemistry. (The Halogens) Aim: To identify and explain the physical trends in group 7. To recognise the tests for Chlorine, Bromine and Iodine. To explain the chemistry of the reactions of Group 7 and Group 1 metals. To Identify the tests for chloride, bromide and iodide ions.

The Halogens………. What do you know about the halogens from Year 10 and 11? Any special properties of the halogens?

Halogen Trends 183 Iodine 58 Bromine -34 Chlorine -188 Fluorine Boiling point in degrees C Colour. State at room temp. Formula. Halogen.

Tests for Halogens Turns starch SOLUTION blue black. Gives a purple colour in an organic solvent . Iodine Bleaches damp blue litmus paper slowly. Bromine will also turn a colourless solution of potassium iodide red brown Bromine Bleaches damp blue litmus paper quickly. Chlorine will also turn a solution of colourless potassium bromide brown. Chlorine Test Halogen

Identifying and Explaining trends ,[object Object],[object Object],[object Object],[object Object],[object Object]

Trends in Atomic Radii. ,[object Object]

Reactions of the Halogens with Group 1 Metals. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Trends in 1 st electron affinity. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Decreasing energy release -314 I -342 Br -364 Cl -348 F Electron affinity kJ mol -1 Halogen

Group 2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Testing and Identifying Halide Ions Aim:To identify the conclusive chemical tests for Halide ions.

Chloride Cl -1 ;Bromide Br -1 ;Iodide I -1 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Results Table I -1 Br -1 Cl -1 Action of conc NH 3 on product Action of dilute NH 3 on product HNO 3 then AgNO 3 Halide Ion

Results Table I -1 Br -1 White ppt dissolves White ppt Cl -1 Action of conc NH 3 on product Action of dilute NH 3 on product HNO 3 then AgNO 3 Halide Ion

Results Table I -1 Br -1 White ppt dissolves White ppt dissolves White ppt Cl -1 Action of conc NH 3 on product Action of dilute NH 3 on product HNO 3 then AgNO 3 Halide Ion

Results Table I -1 Cream ppt Br -1 White ppt dissolves White ppt Cl -1 Action of conc NH 3 on product Action of dilute NH 3 on product HNO 3 then AgNO 3 Halide Ion

Results Table I -1 Cream ppt dissolves No reaction Cream ppt Br -1 White ppt dissolves White ppt Cl -1 Action of conc NH 3 on product Action of dilute NH 3 on product HNO 3 then AgNO 3 Halide Ion

Results Table insoluble Insoluble Yellow ppt I -1 Cream ppt dissolves Insoluble Cream ppt Br -1 White ppt dissolves White ppt Cl -1 Action of conc NH 3 on product Action of dilute NH 3 on product HNO 3 then AgNO 3 Halide Ion

Ionic Equations for the reaction ,[object Object],[object Object],[object Object]

Lesson 1 Group 7 Elements Eam

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Lesson 1 Group 7 Elements Eam