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3a periodic table
| Question | Answer |
|---|---|
| What is chlorines appearance at RTP | Pale green gas |
| What is bromines appearance at RTP | Orange liquid with an orange vapour |
| What is iodines appearance at RTP | Grey solid with a purple vapour |
| What does each halogen look like when dissolved in hexane compared to water | In hexane, halogens produce a stronger colour,where in water it is a paler colour Cl: green and pale green, Br: Orange and pale yellow/brown I: Purple and pale yellow/brown |
| Why does the melting/boiling point increase down group 7 | - Strength of London forces increases because there are more electrons in each atom - More energy is required to break these bonds |
| Covalent bond | The electrostatic forces of attractions between the bonding pairs of electrons and the nuclei |
| Why do Cl-Cl bonds require more energy to break than a Br-Br bond? | Because Cl has a smaller atomic radius so the covalent bond is stronger |
| What occurs when a halogen displacement reaction is carried out? | A more reactive halogen displaces a less reactive halogen from a compound. |
| In a displacement reaction, the MORE reactive halogen ends up | - reduced - oxidising agent - an ion |
| In a displacement reaction, the LESS reactive halogen ends up | - oxidised - reducing agent - diatomic elemental form |
| Chlorine water + KBr | Orange/red solution (Br2) |
| Chlorine water + KI | Violet/pink solution (I2) |
| Bromine water + KI | Violet/pink soluid (I2) |
| What is disproportionation? | A disproportination reaction is a redox reaction where the same element is both oxidised and reduced. |
Created by:
Golbs_Helmet