Flashcards
Electrolysis
Flashcards do conjunto (14)
- 1what happens when an ionic substance is melted or dissolved in water?The ions are free to move about within the liquid or solution.
- 2In electrolysis, what is the name of the substance that is broken down?electrolyte
- 3Where to the positive ions go? What happens?They are attracted to the negative 'cathode' where they gain an electron (reduction)
- 4How is aluminium gained from bauxite?the electrolysis of chryolite and aluminium oxide
- 5what forms where in the electrolysis of bauxite?aluminium forms at the negative electrode
oxygen forms at the positive electrode - 6what is chryolite and why is chryolite used?it is a less common ore of aluminium
- it brings the melting point down to around 900 degrees.. making it cheaper to melt the ore for electrolysis - 7what is electroplating? give 2 examplescoating objects in different metals
-silver plating
-copper plating - 8what happens to the negative ions in electrolysisthey are attracted to the positive 'anode' where they lose an electron (oxidation)
- 92Cl- -> Cl2 + __2e-
- 10If no halide ions are present, what gas will be formed?O2
- 11what does the electrolysis of sodium chloride produce?-sodium hydroxide solution
-hydrogen
-chlorine - 12Why is the postitve electrode made from carbon in the electrolysis of bauxite?- good conductor of electricity
- it is worn away as it reacts with oxygen to for carbon dioxide - 13what is chlorine used for?bleaches and plastics
- 14what is sodium hydroxide used for?making soap
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- gcse chemistry FlashCards sobre Electrolysis, criado por Ella Wolf em 15-05-2013.
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- Ella Wolf
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