- Created by: maryamhamid
- Created on: 28-11-18 11:44
Colours and states at room temperature
- Yellow-green gas
- Red-brown liquid
- Purple solid
- As you go further down, the elements will be solid and darker in colour.
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- Halogens become less reactive down the group
- It is harder to gain an electron when the distance from the outer shell to the nucleus is greater
- They react to form salts called metal halides
- A more reactive halogen will displace a less reactive halogen from a solution of one of its salts in a redox reaction.
- For example, chlorine displaces bromine from sodium bromine solution
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Hydrogen chloride and hydrochloric acid
- Hydrogen chloride gas is simply hydrogen and chlorine bonded together
- Hydrochloric acid is hydrogen chloride gas in solution with water. The ions are separated, so the H+ ions make the solution acidic.
Hydrogen chloride is acidic in water but not methylbenzene.
- Both water and hydrogen chloride are polar molecules
- Methylbenzene is a non-polar molecule
- Polar molecules can only dissolve in other polar molecules
- When hydrogen chloride dissolves, it produces acidic H+ ions
- It will not dissolve in methylbenzene so it is not acidic
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