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Question:

Why can a metal boat float?

Explain thouralghy!!

Answer:

I don't know what is in this cleaner, but I wouldn't be surprised if it had sodium hydroxide (lye) or some similar strong alkaliNaOH (in water) reacts with aluminum to form heat and hydrogen gas (which is, of course, very inflammable) You could, theoretically, power a car on hydrogen gas created by such a method, but you would have several problems: 1) very nasty left over chemicals, and 2) the expense of obtaining/creating the starting materialsAs the guy above said, it's a feasibility problem, not a chemical problem.
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I am not sure, but I think the chemical you are talking about is a very corrosive base, sodium hydroxide, NaOH, which would react with aluminum to form Al(OH)3 and sodium metalSodium metal is very unstable.
You can't get energy for freeAluminum is certainly freely available and so is sodium hydroxideHowever it does not make sense because the energy required to extract aluminum is very considerableSodium hydroxide takes quite a bit of power tooWhat you are doing is using aluminum and NaOH to store energy which gets released when you combine themIts not alternative energyIt is energy storage just like a battery.
try this take two peices of aluminum foil from the kitchen wad one up, it will sink all metal is heavier than water and cannot possibley float not shape the other peice of foil over a small bowl or tennis ball, it will float the part about displacement was very well explained above but perhpas this demonstration will help you see it

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