A lot of people know that it makes an explosion but what chemical is actually produced when mixed to make the bottle expand from pressure?
Hydrogen gasYou mean aluminium foil, right? And toilet bowl cleaner, well I'll assume that it's sodium hydroxideThe reaction goes something like this: Aluminium is oxidized: half-reaction: Al Al(3+) + 3e- Water is reduced: half-reaction: 2H2O + 2e- 2OH- + H2 Triple this: 6H2O + 6e- 6OH- + 3H2 Double the aluminium half-reaction: 2Al 2Al(3+) + 6e- Add: 2Al + 6H2O 2Al(3+) + 6OH- + 3H2 The aluminium ion is complexed by hydroxide ion from the toilet bowl cleanerAl(3+) + 4OH- Al(OH)4(-) Double this: 2Al(3+) + 8OH- 2Al(OH)4(-) Add to the reaction above: 2Al + 6H2O + 8OH- 2Al(OH)4(-) + 6OH- + 3H2 Cancel out 6OH-: 2Al + 6H2O + 2OH- 2Al(OH)4(-) + 3H2 With the counter-ions, it would be 2Al + 6H2O + 2NaOH 2Na[Al(OH)4] + 3H2