00:02
Hi, in this question, we have a piece of aluminum foil.
00:08
So let me sketch out a piece of very much magnified aluminum foil.
00:15
And we place it in hydrochloric acid.
00:22
And what is noticed is that for the first 30 seconds or so, nothing really happens.
00:31
And then after the first 30 seconds, you start getting vigorous bubbling and the aluminum foil disappears.
00:39
So let's talk about what's going on there.
00:43
Like most metals, when exposed to oxygen, you will get a thin coating of the metal oxide.
00:56
So in this case, we have some aluminum oxide here, coating the piece of aluminum foil...
