Halogens To know how the Group 7 elements behave. (Grade C)

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Presentation transcript:

Halogens To know how the Group 7 elements behave. (Grade C) To know how the properties of the Group 7 elements change down the group. (Grade B) To explain the relative reactivity of Group 7 elements in terms of their electronic structure. (Grade A/A*) Keywords: Halogen, Displacement Reactions, Reactivity

Questions What is another name for elements in group 7? What name is given to a 1- ion made from a group 7 element? A reaction in which a more reactive element takes the place of a less reactive element is called? How do the group 7 elements exist as molecules?

Questions What is another name for elements in group 7? Halogen What name is given to a 1- ion made from a group 7 element? Halide ion A reaction in which a more reactive element takes the place of a less reactive element is called? Displacement Reaction How do the group 7 elements exist as molecules? In pairs, e.g. Cl2

Keywords: Halogen, Displacement Reactions, Reactivity To know how the Group 7 elements behave. (Grade C) To know how the properties of the Group 7 elements change down the group. (Grade B) To explain the relative reactivity of Group 7 elements in terms of their electronic structure. (Grade A/A*) Keywords: Halogen, Displacement Reactions, Reactivity

Keywords: Halogen, Displacement Reactions, Reactivity To know how the Group 7 elements behave. (Grade C) To know how the properties of the Group 7 elements change down the group. (Grade B) To explain the relative reactivity of Group 7 elements in terms of their electronic structure. (Grade A/A*) Keywords: Halogen, Displacement Reactions, Reactivity Group VII (The Halogens) Poisonous elements Coloured vapours Low melting points and boiling points Poor conductors of energy and electricity Exist as molecules made up of pairs of atoms, joined by covalent bonds. They need one electron to have a full outer shell (structure of noble gas). React with metals to gain one electron, ionic bond, e.g. NaCl. React with other non-metals to share electrons, covalent bond, e.g. HCl.

Keywords: Halogen, Displacement Reactions, Reactivity To know how the Group 7 elements behave. (Grade C) To know how the properties of the Group 7 elements change down the group. (Grade B) To explain the relative reactivity of Group 7 elements in terms of their electronic structure. (Grade A/A*) Keywords: Halogen, Displacement Reactions, Reactivity Displacement Reactions between Halogen This is where a more reactive halogen displaces a less reactive halogen from solution of its salts. Example: Bromine displaces iodine as Br is more reactive than I. Chlorine + Potassium Bromide  Potassium Chloride + Bromine

Keywords: Halogen, Displacement Reactions, Reactivity To know how the Group 7 elements behave. (Grade C) To know how the properties of the Group 7 elements change down the group. (Grade B) To explain the relative reactivity of Group 7 elements in terms of their electronic structure. (Grade A/A*) Keywords: Halogen, Displacement Reactions, Reactivity Fluorine This is the most reactive, but so reactive that is reacts so strongly with water that we cannot carry out any reactions in aqueous solutions.

Keywords: Halogen, Displacement Reactions, Reactivity To know how the Group 7 elements behave. (Grade C) To know how the properties of the Group 7 elements change down the group. (Grade B) To explain the relative reactivity of Group 7 elements in terms of their electronic structure. (Grade A/A*) Keywords: Halogen, Displacement Reactions, Reactivity Copy and complete the following reactions: F2 + ______  2HF Cl2 + ________  2KCl + I2 Br2 + 2KCl  ______________

Keywords: Halogen, Displacement Reactions, Reactivity To know how the Group 7 elements behave. (Grade C) To know how the properties of the Group 7 elements change down the group. (Grade B) To explain the relative reactivity of Group 7 elements in terms of their electronic structure. (Grade A/A*) Keywords: Halogen, Displacement Reactions, Reactivity Copy and complete the following reactions: F2 + H2  2HF Cl2 + 2KI  2KCl + I2 Br2 + 2KCl  No Reaction

Keywords: Halogen, Displacement Reactions, Reactivity To know how the Group 7 elements behave. (Grade C) To know how the properties of the Group 7 elements change down the group. (Grade B) To explain the relative reactivity of Group 7 elements in terms of their electronic structure. (Grade A/A*) Keywords: Halogen, Displacement Reactions, Reactivity Complete summary questions from book.

Halogens To know how the Group 7 elements behave. (Grade C) To know how the properties of the Group 7 elements change down the group. (Grade B) To explain the relative reactivity of Group 7 elements in terms of their electronic structure. (Grade A/A*) Keywords: Halogen, Displacement Reactions, Reactivity