GCSE Chemistry Question Analysis Topic: Chemistry - Electrolysis
Exam Questions:
1) Why is red phosphorus less reactive than white phosphorus?
2) Give two examples of water soluble vitamins.
3) Why does copper obtained in the extraction from copper pyrites have a blistered appearance?
Answers:
For GCSE Chemistry, you should know:
1) The discrete P4 tetrahedron that makes up white phosphorus is subjected to extremely high angular strain because its angle is 600. The P4 tetrahedra used to make red phosphorus have a significantly less angular strain. White phosphorus is extremely reactive and unstable due to the high angular strain.
2) Water-soluble vitamins like vitamin B complex and vitamin C need to be supplied daily because they are not retained by the body.
3) Blister copper is so named because the sulphur dioxide that escapes from the melt and becomes trapped in the colder areas of the molten copper surface gives copper a blistery appearance.
Work hard for your GCSE Chemistry examination!
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