The Halogens 3.5 / 5 based on 2 ratings ? ChemistryReactionsASEdexcel Created by: rhiannaeleanorCreated on: 06-02-14 11:10 Which statement is true? The Halogens have low melting and boiling points which increase down the group. 1 of 17 Which sub-shell do the highest energy electrons belong to in a Group 7 element? p sub-shell 2 of 17 What is meant by the 'oxidising power' of a Halogen? A measure of the strength with which a halogen atom is able to attract and capture an electron to form a halide. 3 of 17 Which statement is true? The reactivity of the Halogens decreases down the group. 4 of 17 What 3 points explain the trend in reactivity down the group? Atomic radius increases; Electron shielding increases; Ability to gain an electron into the p sub-shell decreases to form a halide ion. 5 of 17 What happens in a 'displacement reaction'? A more-reactive halogen will oxidise and displace a halide of a less-reactive halogen. 6 of 17 In a displacement reaction, in the order of Cl2, Br2, I2, what are the colours of the halogens in water? Pale-green, Orange, Brown 7 of 17 In a displacement reaction, in the order of Cl2, Br2 and I2, what are the colour of the halogens in cyclohexane? Pale-green, Orange, Violet 8 of 17 What is 'Disproportionation'? A reaction in which the same element is both reduced and oxidised. 9 of 17 What is formed when a Group 7 element reacts with a metal? Ionic halide with an X- ion. 10 of 17 What are the strucural properties of a Group 7 element? Simple molecular; Weak van der Waals' forces between diatomic molecules. 11 of 17 What colour and state is fluorine? Pale yellow-green gas. 12 of 17 What is the typical charge of an ionic halide? 1- 13 of 17 Why does chlorination of water take place? To kill bacteria. 14 of 17 Why do some people object to chlorination of water? Chlorine is a toxic gas. 15 of 17 What solution is added to a halide solution to detect the presence of halide ions? Aqueous solution of Silver Nitrate (AgNO3). 16 of 17 What is a precipitation reaction? The formation of a solid from a solution during a chemical reaction. 17 of 17
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