Basically electrolysis is used to separate ionic compounds that cannot be separated by carbon as they are more reactive than carbon, for example aluminium (Al3O2). Electrolysis used electricity to chemically decompose the ionic compound to get the pure form eg to separate the aluminium from the oxygen as we want to use aluminium. The aluminium (called the electrolyte) needs to be molten so that the ions are a free to move and can complete the circuit. The aluminium ions are positively charged and move to the negative electrode called the cathode. Here the aluminium ions gain electrons to become neutral aluminium atoms. Whereas at the positive electrode (the anode) negatively charged oxygen ions move here and lose electrons to become neutral and oxygen atoms. The aluminium is pure and is now separated from the oxygen.Aluminium is in group 3 so it has a 3+ charge, therefore it needs 3 electrons to become neutral.Oxygen has a -2 charge so needs to lose 2 electrons to become neutral. Don't forget that oxygen is a diatomic molecule so at the end you'll need to write O + O = O2.
I hope I explained alright and it helps
Thankyou this is very helpful. what are your predictions for the 6 mark questions ?
I'm assuming that's about the effect of mining ores on the environment? You could talk about the benefits of jobs/transport/useful metal products made however there are negative impacts e.g. high energy use/toxic fumes when extracting metals/ landscape and habitat destruction/ mine shafts can be dangerous. This is very brief but hope it helps
haha my school made me do chemistry and physics last year (im doing my biology triple this year). So happy the stress is gone however i wont lie the 2015 paper was much harder than the 2016 ones
C4 - Mendeleev,Newlands and Dobereiner or Ions C5 - Different types of bonds so ionic, metallic and covalent - sim and differences or Electrolysis C6 - Rates of reaction or Titrations
C4 - Mendeleev,Newlands and Dobereiner or Ions C5 - Different types of bonds so ionic, metallic and covalent - sim and differences or Electrolysis C6 - Rates of reaction or Titrations
Oh goddddd Those C6 predictions are my absolute worst nightmare! If titrations come up I will honestly hit my head on the desk
Can't we just have a nice one on diamond vs graphite for C5
C4 - Mendeleev,Newlands and Dobereiner or Ions C5 - Different types of bonds so ionic, metallic and covalent - sim and differences or Electrolysis C6 - Rates of reaction or Titrations
Nice predictions! What do you mean by "sim and differences or Electrolysis" ??
Oh goddddd Those C6 predictions are my absolute worst nightmare! If titrations come up I will honestly hit my head on the desk
Can't we just have a nice one on diamond vs graphite for C5
Ahah I love rates of reactions. But yeah for C5 if graphite/diamond came up I would loooove that! I really hate those mathsy ones uh and i hate testing for ions too
Ahah I love rates of reactions. But yeah for C5 if graphite/diamond came up I would loooove that! I really hate those mathsy ones uh and i hate testing for ions too
Hm I guess rate of reaction isn't that bad, it's titrations that really get to me. Same haha, although I don't mind mathsy ones too much. Oh god testing for ions would be dreadful too! I feel like the only thing I'm prepared for for this exam is C4 lmao
Hm I guess rate of reaction isn't that bad, it's titrations that really get to me. Same haha, although I don't mind mathsy ones too much. Oh god testing for ions would be dreadful too! I feel like the only thing I'm prepared for for this exam is C4 lmao
oh right, i thought he made a typo and meant 'sim/diff of electrolysis, my bad Uh tell me about it, i hate titrations. I'm cramming everything now, havent even got to that lool. At least you feel confident about some of it, the only stuff i like is the environment, graphite/diamond and history of periodic table. I'm screwed with C456 basically but i did well on C123 so it should be ok good luck to you